mk part l guide

7/29/2019 MK Part L Guide

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A uide to Part L


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Tackling climate change is one o the biggest long-term

challenges we ace. That is why on this occasion we

need the building industry to comply with the new

regulations much more rapidly than normal. These

new regulations, combined with those in 2002, deliver

a 40% increase in energy eciency standards in just

our years, and cut householders uel bills too

Press Release, The ODPM, 22nd February 2006, Yvette Cooper,

Housin and Plannin Minister

Part L came into aect under the Building Regulations

on 1st April 2002 and is only relevant to England and

Wales. Part L concerns Conservation o Fuel and Powerand was revised and issued on the 6th April 2006 to

ensure compliance with the legal obligations set out in

the European Union Energy Perormance o Buildings

Directive (EPBD). The EPBD is a new perormance

standard based upon target carbon dioxide emissions

rates or buildings.


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Contents

Part L and Approved Document L, an overview 4

MK analysis 17

How does Part L aect you? 20

What should you do to ensure your

work complies with Part L? 21

Frequently asked questions 26


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Part L and Approved Document L, an

overview

Part L requirements apply to all work unless:

l work has started beore 6th April 2006 in accordance with a

building notice, ull plans, initial notice or amendment notice

l ull plans are not required to be deposited, a contract is entered

into beore 6th April 2006, provided that the work is started

beore 1st October 2006l ull plans have been deposited and approved beore 6th April

2006, provided that work is started 1st April 2007

l a plans certicate or plans certicate combined with an initial

notice has been given to a local authority beore 6th April 2006,

provided that the work is started beore 1st April 2007

Part L o the Building Regulations is concerned with the Conservation o

Fuel and Power in new and existing dwellings, and other buildings. In the

Secretary o States view, compliance with Part L will be met by making

reasonable provisions in a number or areas.

Part L is split into 4 sections.

l L1A Conservation o uel and power in new dwellings

l L1B Conservation o uel and power in existing dwellings

l L2A Conservation o uel and power in new buildings other

than dwellings

l L2B Conservation o uel and power in existing buildings other

dwellings

Although the requirements are common, the guidance provided in

Approved Document L diers or each section.


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REQUIREMENT

PART L CONSERVATION OF FUEL AND POWER

Reasonable provision shall be made or the conservation o uel

and power in buildings by:

(a) limiting heat gains and losses:

i. through thermal elements and other parts o the building

abric; and

ii. rom pipes, ducts and vessels used or space heating, space

cooling and hot water services;

(b) providing and commissioning energy ecient xed building

services with eective controls; and

(c) providing to the owner sucient inormation about the

building, the xed building services and their maintenance

requirements so that the building can be operated in such a

manner as to use no more uel and power than is reasonable

in the circumstances.

Eemptions to Part L

A number o buildings are exempt rom Part L o the Building Regulations,

see below or common occurrences. Table 2 is not intended to be a

complete list o exemptions, or ull details reer to Approved Document

L1A, L1B, L2A or L2B: Other Changes to the Regulations (p7), and

Schedule 2 which can be ound within Regulation 9 o the BuildingRegulations, most recently updated by Statutory Instrument 2531.

TABLE1

ExEMPTIONS TO PART L

l buildings controlled under other legislation (or example the

Explosives Acts and the Nuclear Installations Act)

l buildings with are listed in accordance with section 1 o the

Planning Act 1990 (Listed Buildings and Conservation Areas),

where compliance with energy eciency requirements would

unacceptably alter their character or appearance

TABLE2


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ExEMPTIONS TO PART L

l buildings included in the schedule o monuments

maintained under section 1 o the Ancient Monuments and

Archaeological Areas Act 1979 [13], where compliance with

energy eciency requirements would unacceptably alter their

character

l buildings which are used primarily or solely as places o worship

l temporary buildings with a planned time o use o two years

or less, with low energy demands

l buildings not requently used by people (or example adetached building into which people go only intermittently

and then only or the purpose o inspecting or maintaining

xed plant or machinery)

l a greenhouse (not including a greenhouse i the principle

purpose is retailing, packing or exhibiting)

l agricultural buildings (see Class III o Regulation 9 or ullcriteria)

l ancillary buildings (such as site cabins, see Class V o

Regulation 9 or ull criteria)

l detached, single storey buildings, having a foor area

which does not exceed 30m2, which contains no sleeping

accommodation (see Class VI o Regulation 9 or ull criteria)

Approved Document L1A, L2A, L1B and L2B provide practical guidance

or some o the more common building situations with respect to the

technical requirements o the Building Regulations. There is no obligation

to adopt any particular solution contained in the Approved Documents

i you preer to meet the relevant requirements in some other way. As

L1A, L2A, L1B and L2B apply to dierent types o buildings, the Approved

Documents provide dierent content and guidance accordingly.


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APPROVED DOCUMENT L1A: CONSERVATION OF FUEL AND POWER

IN NEW DWELLINgS

Section 1: Design Standards

Section 2: Quality o Construction and CommissioningSection 3: Providing Inormation

Section 4: Model Designs

Section 5: Denitions

APPROVED DOCUMENT L1B: CONSERVATION OF FUEL AND POWER

IN ExISTINg DWELLINgS

Section 1: Guidance Relating to Building WorkSection 2: Guidance on Thermal Elements

Section 3: Providing Inormation


APPROVED DOCUMENT L2A: CONSERVATION OF FUEL AND POWER

IN NEW BUILDINgS OTHER THAN DWELLINgS

Section 1: Design StandardsSection 2: Quality o Construction

Section 3: Operating and Maintenance Instructions

Section 4: Model Designs


APPROVED DOCUMENT L2B: CONSERVATION OF FUEL AND POWER

IN ExISTINg BUILDINgS OTHER THAN DWELLINgSSection 1: Consequential Improvements

Section 2: Guidance Relating to Building Work

Section 3: Guidance on Thermal Elements

Section 4: Providing Inormation


TABLE3


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APPROVED DOCUMENT L1A: CONSERVATION OF FUEL AND

POWER IN NEW DWELLINgS

SECTION 1 (DESIgN STANDARDS), CRITERION 1 (ACHIEVINg THETARgET CO

2EMISSIONS RATE)

Lihtin

29 In all cases the DER (Dwelling CO2

Emission Rate) should be calculated

using a xed assumption o 30% low energy lighting.

SECTION 1 (DESIgN STANDARDS), CRITERION 2 (LIMITS ON

DESIgN FLExIBILITY)

Desin Limits or ed buildin services: Fied internal lihtin

42 A way o showing compliance would be to provide light ttings

(including lamp, control gear and an appropriate housing, refector,

shade or diuser or other device or controlling the output light) that

only take lamps having luminous ecacy greater than 40 lumens per

circuit-Watt. Circuit-Watts means the power consumed in lightingcircuits by lamps and their associated control gear and power actor

correction equipment.

43 Reasonable provision would be to provide in the areas aected by

the building work, xed energy ecient light ttings that number

not less than the greater o:

(a) one per 25m2 odwelling foor area (excluding garages) orpart thereo; or

(b) one per our xed lighting ttings.

TABLE4

The Approved Documents cover various types o work and installations,

the key areas which reer to electrical installations, or guidance, which

can be met by electrical installations, are shown here. The ull Approved

Documents should be reerred to or inormation on other types o work

or example; heating, insulation, air permeability, ventilation, cooling,

limiting solar gain etc.


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44 Lighting ttings in less requented areas like cupboards and other

storage areas would not count. GIL20 (Low energy domestic

lighting, EST 2006) gives guidance on identiying suitable locations.

Desin Limits or ed buildin services: Fied eternal

lihtin

Fixed external lighting means lighting xed to an external surace o the

dwelling supplied rom the occupiers electrical system. It excludes the

lighting in common areas in blocks o fats and other access-way lighting

provided communally.

45 Reasonable provision would be to enable eective control and/or

the use o ecient lamps such that:

(a) EITHER: Lamp capacity does not exceed 150W per light tting

and the lighting automatically switches o:

i. When there is enough daylight; and

ii. When it is not required at night(b) OR: the lighting ttings have sockets that can only be used

with lamps having an ecacy greater than 40 lumens per

circuit watt.


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APPROVED DOCUMENT L1B: CONSERVATION OF FUEL AND

POWER IN ExISTINg DWELLINgS

SECTION 1 (gUIDANCE RELATINg TO BUILDINg WORk), THE

ExTENSION OF A DWELLINg

Heatin and Lihtin in the Etension

17 Where a fxed building service is provided or extended as part o

constructing the extension, reasonable provision would be to ollow the

guidance in paragraphs 35 to 48.

Fied Internal Lihtin

43 Reasonable provision should be made or dwelling occupiers to

obtain the benets o ecient electric lighting whenever

(a) a dwelling is extended; or

(b) a new dwelling is created rom a material change o use; or

(c) an existing lighting system is being replaced as part o

re-wiring works.The re-wiring works must comply with Part P.

44 A way o showing compliance would be to provide light ttings

(including lamp, control gear and an appropriate housing, refector,

shade or diuser or other device or controlling the output light) that

only take lamps having luminous ecacy greater than 40 lumens per

circuit-Watt. Circuit-Watts means the power consumed in lightingcircuits by lamps and their associated control gear and power actor

correction equipment.

45 Reasonable provision would be to provide in the areas eected by

building work, xed energy ecient light ttings that number not

less than the greater o

(a) one per 25m2

odwelling foor area (excluding garages) orpart thereo; or

(b) one per our xed lighting ttings.

TABLE5


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46 A light tting may contain one or more lamps.

47 Light ttings in less used areas like cupboards and other storage areas

would not count towards the total. GIL20 (Low energy domestic

lighting, EST 2006) gives guidance on identiying suitable locations

or energy ecient luminaries. In some cases, it may be more

appropriate to install the energy ecient light tting in a location

that is not part o the building work, e.g. to replace the tting on the

landing when creating a new bedroom through a lot conversion.

Fied Eternal Lihtin

Fixed external lighting means lighting xed to an external surace o the

dwelling supplied rom the occupiers electrical system. It excludes the

lighting in common areas in blocks o fats and other access-way lighting

provided communally.

48 When providing xed external lighting reasonable provision would

be to enable eective control and/or the use o ecient lamps

such that:

(a) EITHER: Lamp capacity does not exceed 150W per light tting

and the lighting automatically switches o:

iii. When there is enough daylight; and

iv. When it is not required at night

(b) OR: the lighting ttings have sockets that can only be used

with lamps having an ecacy greater than 40 lumens per

circuit watt.


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APPROVED DOCUMENT L2A: CONSERVATION OF FUEL AND

POWER IN NEW BUILDINgS OTHER THAN DWELLINgS

SECTION 1 (DESIgN STANDARDS), CRITERION 2 (LIMITS ON

DESIgN FLExIBILITY)

33 Whilst the approach to complying with Criterion 1 allows considerable

design fexibility, Part L requires that reasonable provision should

be made to limit heat gains and losses (Part L1(a), and that energy

ecient fxed building services and eective controls be provided

(L1(b)). These requirements would be met by speciying perormance

standards that are no worse than those given in paragraphs 34 to 62.

Controls or general Lihtin in all Types o Spaces

54 Lighting controls should be provided so as to avoid unnecessary

lighting during the times when daylight levels are adequate or when

spaces are unoccupied.

For saety reasons automatically switched lighting systems should be

subjected to risk assessment which may indicate saety should take

precedence over energy efciency.

55 Reasonable provision would be local switches in easily accessible

positions within each working area, or at boundaries between

working areas and general circulation routes, that are manually

operated by the deliberate action o the occupants.

Manual switches include rocker switches, push buttons and pull

cords and remote switching devices such as wireless transmitters and

telephone handsets.

56 For the purposes o this Approved Document, switches include

dimmer switches and switching includes dimming. It would usually

be reasonable or dimming to be eected by reducing rather than

diverting the energy supply.

TABLE6


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57 The distance on plan rom any local switch to any luminaire it controls

should generally be not more than six metres or twice the height o

the luminaire above the foor i this is greater. Where a space is

daylit space served by side windows, it would be reasonable or theperimeter row o luminaries to be separately switched.

58 Occupant control o local switching can be supplemented by other

controls such as automatic systems which:

(a) switch the lighting o when they sense the absence o

occupants; or

(b) either dim or switch o the lighting when there is sucientdaylight. When installed in appropriate locations, such control

systems can make a useul contribution towards reducing the

BER (Building Emission Rate).

62 A way o meeting the requirement would be to connect display

lighting in dedicated circuits that can be switched o at times

when people will not be inspecting exhibits or merchandise orattending entertainment events. In a retail store, or example, this

could include timers that switch the display lighting o outside

store opening hours, except or displays designed to be viewed rom

outside the building through display windows.


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APPROVED DOCUMENT L2B: CONSERVATION OF FUEL AND

POWER IN ExISTINg BUILDINgS OTHER THAN DWELLINgS

SECTION 1 (CONSEQUENTIAL IMPROVEMENTS)

TABLE 1: IMPROVEMENTS THAT IN ORDINARY CIRCUMSTANCES

ARE PRACTICAL AND ECONOMICALLY FEASIBLE

4 Upgrading general lighting systems that have an average lamp

ecacy o less than 40 lamp-lumens per circuit watt and that serve

areas o greater than 100m2 by the provision o new luminaries or

improved controlsSection 2 (guidance Relatin to Buildin Wor)

Wor on Controlled Services and Fittins

Controlled Services

41 Where the work involves the provision or extension o controlled

services, reasonable provision would be to:

(c) Provide new lighting systems with appropriate controls to

achieve reasonable standards o energy eciency. In normal

circumstances, reasonable provision would be to provide controls

in accordance with the guidance in paragraphs 54 to 66;

Fied Internal Lihtin

54 Reasonable provision would be to install new systems that meet the

criteria in paragraphs 55 to 66, depending on the use o the space.

general Lihtin Efcacy in Ofce, Industrial and Storae areas in

All Buildin Types

55 For the purposes o this Approved Document, oce includes

those areas that involve predominantly desk-based tasks, including

classrooms, seminar rooms and conerence rooms, including those

in schools.

TABLE7


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56 Reasonable provision would be to provide lighting with an average

ecacy o not less than 45 luminaire-lumens/circuit-watt as averaged

over the whole area o these space types in the building.

57 The average luminaire-lumen/circuit-watt is calculated by:

(Lamp-lumens x LOR) summed or all luminaires in the relevant areas o

the building, divided by the total (circuit watts x control actor) or all the

luminaries where:

(a) Lamp-lumens = the sum o the average initial (100 hour) lumen

output o all the lamp(s) in the luminaire; and

(b) LOR = the light output ratio o the luminaire, which means

the ratio o the total light output o a luminaire under stated

practical conditions to that o the lamp or lamps contained in the

luminaire under reerence conditions.

(c) Control actor = the actor applicable when automatic controls

substantially reduce the power consumption o the luminaire

when electric light is not required.The controls actor is included in Approved Document L2B to allow

greater fexibility and to encourage better controls.

Lihtin Controls or general Lihtin in all Types o Space

59 Lighting controls should be provided so as to avoid unnecessary

lighting during the times when daylight levels are adequate or when

spaces are unoccupied. However, the operation o automatically

switched lighting systems should be subjected to risk assessment or

saety and suitability.


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60 Reasonable provision would be local switches in easily accessible

positions within each working area or at boundaries between

working areas and general circulation routes that are operated by the

deliberate action o the occupants (reerred to as occupant control),either manually or remotely.

Manual switches include rocker switches, push buttons and pull

cords. Remote switches include wireless transmitters and telephone

handset controls. For the purposes o Approved Document L,

reerence to switches includes dimmer switches and switching

includes dimming. As a general rule, dimming should be eected

by reducing rather than diverting the energy supply.

61 The distance on plan rom any local switch to any luminaire it controls

should generally be not more than six metres or twice the height o

the luminaire above the foor i this is greater. Where a space is

daylit space served by side windows, it would be reasonable or the

perimeter row o luminaries to be separately switched.

62 Occupant control o local switching can be supplemented by other

controls such as automatic systems which:

(a) switch the lighting o when they sense the absence o

occupants; or

(b) either dim or switch o the lighting when there is sucient

daylight.Controls or Display Lihtin in all Types o Space

66 A way o meeting the requirement would be to connect display

lighting in dedicated circuits that can be switched o at times

when people will not be inspecting exhibits or merchandise or

attending entertainment events. In a retail store, or example, this

could include timers that switch the display lighting o outsidestore opening hours, except or displays designed to be viewed rom

outside the building through display windows.


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MK analysis

Part L has brought to the oreront o electrical contractors and designers

minds the Building Regulations and their requirements. All building workmust comply with the regulations under the Building Regulations o 2000

introduced under the Statutory Instrument 652, the legislation covering

England and Wales, but not Scotland or Northern Ireland. It was

introduced by the Secretary o State or the Environment under powers

given by Parliament under the Building Act o 1984. Section (1) (1a) o

this act states the Building Regulations may be made or various purposes

including health, saety, welare and convenience o contamination o

building users, the conservation o uel and power, and the prevention o

contamination o water supplies. As the Building Regulations are an Act

o Parliament ailure to comply, be it the company or individual carrying

out the work, or person ordering the work, is a criminal oence and

could lead to prosecution.

The UK government set out its energy policy in February 2003 with the

publication o the Energy White Paper, this addressed our key areas:

l the environment

l the reliability o energy supply

l aordable energy or the poorest

l competitive energy markets or businesses, industries and

households

The White Paper put the UK on a road to a reduction by 60% in carbon

dioxide emissions by 2050 rom 605 to 238 million tonnes o carbon

dioxide per year. In addition, the UK government has made a commitment

to the European Union Energy Perormance o Buildings Directive. This

directive sets out objectives to promote the introduction o cost eective

measures, including renewable energy systems to improve the energy

perormance o new and existing buildings, in which it recognised that

the largest potential energy savings lies with existing building stock.


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With these targets in mind, and the ever-growing issues and concerns

around energy consumption, and the eciency and environmental

impact o buildings, Part L o the Building Regulations was reissued in

April o 2006. The requirement o Part L is that Reasonable provision

shall be made or the conservation o uel and power in buildings, and it

is proposed this requirement is met by:

l limiting heat gains & losses through thermal elements and other

parts o the building abric and rom pipes, ducts, and vessels

used or space heating, space cooling and hot water services

l providing and commissioning energy ecient xed buildingservices with eective controls and

l providing to the owner sucient inormation about the

building, the xed building services and their maintenance

requirements so that the building can be operated in such a

manner as to use no more uel and power than is reasonable in

the circumstances

As previously discussed a requirement o the European Union Energy

Perormance o Buildings Directive is the need to look at existing buildings

as these have the greatest potential or energy savings due to the type

o plant and equipment installed, and the construction methods and

materials used. This has been recognised in Approved Documents L1B

and L2B covering existing buildings.

When analysing energy use within buildings, lighting represents 40%

(source: derived rom Building Research Establishment Data) o the

total energy usage, and as such, the type o lighting installed and the

respective controls are vital to reducing the overall energy consumption.

In addition, the reduction o CO2

emissions has been more successul, to

date, in other areas such as Heating and Cooling, but less successul in

the area o lighting. With eciency drives the overall emission rate since

1995 has dropped by 45%, but the level o emissions stemming rom

lighting sources has only dropped by 9%, presenting a need to address

the eciency o light ttings and controls.


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1.520.80 0.69

1.42

1.110.73

1.40

0.97

0.35

1.60

1.65

1.45

0.07

0.07

0.07

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

1995 2002 2006

TonnesCO2

PerYear

Hot Water Lighting Aux Electric Cooling Heating

Source: Part L Explained, BRE Guide


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How does Part L aect you?

I you or your company carries out Electrical Installation work in England

and Wales you will need to have knowledge o Part L and be competentenough to ensure your work complies with the requirements.

You will also be asked to notiy and possibly be inspected by the Local

Authoritys Building Control. Alternatively, you may sel-certiy your

work, to do this you must be a member o a government approved

sel-certication scheme. The sel-certication schemes have now been

widened throughout England and Wales or Part L, and more schemeoperators have been approved to assist with the demand. I you are a

member o a competent persons scheme, the Local Authority Building

Control is oblidged to accept your sel certication.


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What should you do to ensure your

work complies with Part L?

There are a number o guidelines within each Approved Document (L1A,

L1B, L2A, L2B), which will need to be considered, depending on the type

o work you are carrying out, and the building within which you are

working.

For new dwellings there are ve key points within Approved Document

L1A which address the issues o lighting design and lighting controls.Point 29 in Section 1 states that in order to achieve the target CO

2

emissions rate, it is assumed at least 30% o lighting is low energy.

In addition, with regard to xed internal lighting, points 42 to 44 in

Section 1 discuss ways o complying by the use o energy ecient light

ttings and the position o those light ttings. When considering xed

external lighting, point 45, the recommendations are based aroundthe control o those lights as well as the light ttings and lamps. It is

suggested that the external lights are only in use when there is a need

An example o compliance here would be to install light ttings which

automatically detect the light levels and automatically turn on the light

when it is dark. Alternatively a PIR which detects presence and then turns

on a light could save energy by only activating lighting when required.Either o these options, or a timer switch would potentially limit the use

o external lighting to those times when it is required.

Similarly, or existing dwellings, within Approved Document L1B, points

43 to 48 cover the same criteria or xed internal lighting, with reerence

to energy ecient light ttings and their location, and the use o suitable

controls or xed external lighting. I re-wiring works are undertaken, it isa requirement that energy ecient lighting is installed.


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When considering new buildings other than dwellings (L2A), or example

commercial, industrial, educational and medical acilities, point 33 in the

Approved Document states that energy ecient xed building services

and eective controls should be provided.

l general lighting in oces, industrial and storage areas

l controls or general lighting

l display lighting

l controls or display lighting

Oce lighting also includes any predominately desk based tasks, covering

areas such as classrooms and conerence rooms, within these areas and

those classed as storage and industrial, lighting should be provided that

gives an average ecacy o not less than 45 lumens per circuit watt. This

will be averaged over the whole area o the building. This allows the use

o all types o lighting, with the designer o the installation calculating the

average lumens per circuit watt with manuacturers data on the ttings

and lamps used.

With regard to controls, Section 54 states that lighting controls should

be provided so as to avoid unnecessary lighting during the times when

daylight levels are adequate or the area is unoccupied, although or saety

reasons automatically switched lighting systems should be subjected to

a risk assessment which may indicate that saety takes precedence over

energy considerations.

Eective, ecient controls allow building occupants to take charge o

their locality and can give substantial savings in energy costs, by simply

introducing switches, dimmers or wireless controls within the prescribed

distance o the luminaire, the occupant has the ability to turn the light

on or o as required. However, occupants may not always remember to

turn o the lights, so energy wastage may still occur. Occupant control

o local switching can be supplemented by other controls that operate

automatically by switching the lighting on when they sense movement

or o when they detect the absence o occupants. In addition controls

are available which can either dim or switch o the lighting when there


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is sucient daylight. These controls can be simple PIRs and occupancy

sensors or more sophisticated multi unctional devices that measure both

movement and light levels and react accordingly, managing the lighting

level within an area by either turning lighting o, dimming down to a

lower level or a combination o the two.

Similarly, or existing buildings other than dwellings, within Approved

Document L2B, recommendations are made with regard to energy

ecient lighting and controls. Control actors may now be used in

calculating the average overall illuminance, and this may allow or the

use o existing light ttings. I an area is to be reurbished, and it is in

excess o 100m2, provision should be made or energy ecient lighting

and controls.

When selecting sensors to control lighting in an installation, the choice o

the most suitable control will be dependent upon the area into which the

lighting is installed.

For an owned space, that is one within which the occupant intends to

control the lighting, manual or fexible manual controls are recommended.

For example in an oce, workshop or consulting room the lighting

control could be a switch or dimmer, or a remote control which could be

used rom various locations within the space.

Within a shared area, or example an open plan oce or production area,

the recommended lighting controls are fexible manual and photo electric

dimming. Flexible manual controls could incorporate a remote control to

be used by occupants, a more energy conscious choice would be photo

electric dimming, which would also consider the ambient light provided

by external daylight, or other lighting sources in the area.

Recommended controls or temporarily owned spaces, such as classrooms

or meeting rooms, which are not constantly in use, are manual controls

and absence detectors. An absence detector has a manual control,

which could be operated to turn the lights on when entering a space.

When movement is no longer detected, and ater a certain amount o

pre-programmed time has elapsed, the absence detector will turn the


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lights o. Presence and absence detectors are also recommended or

occasionally visited areas such as storerooms and toilets.

Lighting in un-owned areas, such as corridors and stairways could be

eciently controlled using presence detection or photo-electric dimming,dependent on occupancy levels and the amount o natural daylight

present in the area.

For larger managed areas, such as restaurants, shops, railway terminals,

etc, a variety o solutions may be relevant dependent on a number o

actors including size o space, natural daylight, times o day or night

lighting is required, etc. Recommended solutions or managed areas are

photo-electric dimming, time switching and centralised manual controls.

As with all lighting control specication, you should take into account the

oot all and occupancy levels o the area, exposure to natural light, and

the times o day when the area is likely to be occupied or used.

As urther discussed in L2A and L2B, the installation o energy metersshould be undertaken in non-dwellings, with the objective o enabling

the building manager or owner to be able to account or at least 90% o

the energy usage o each type o uel by category (lighting, heating, air

conditioning etc).

When working on buildings other than dwellings, the owner o the

building should be provided with sucient inormation about thebuilding, the xed building services and their maintenance requirements

so that the building can be operated in such a manner as to use no more

uel and power than is reasonable in the circumstances.

A way o showing compliance would be to provide a log book, in

accordance with the CIBSE TM 31 Building Log Book Toolkit32. The data

calculated to provide the Target CO2 Emissions Rate and the BuildingCO

2Emission rate should be included. In addition, or existing buildings

additional inormation should be provided regarding thermal elements,

xed building services, energy meters and any other relevant details

relating to energy consumption (see Approved Document L2B, Section 4

or ull details).


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ENERgY SAVINg CARD SWITCH

l

Choice o mains or low voltagel Switches o power when room is

unoccupied

l Ideal or hotels, guest houses and

residential applications

What Products do Mk oer to comply with Part L?

MK Electrics vast portolio oers many products to acilitate Part L

compliance, or more inormation, please reer to the MK Specication

Guide.

SENSORS

l Range o ceiling and corner mounted sensors

l Sensors oer energy savings o up to 90%*

l Ideal or schools, oces and warehouses

* Source: Department o Environment, Energy

Eciency Oce

LOW ENERgY CEILINg ACCESSORIES

l Range o low energy pendants and

batten holders

l Suitable or all applications, extensivelyused within the residential sector

PHOTO ELECTRIC SWITCH

l Masterseal dusk to dawn IP56 switch

l Automatically detects light levels and turns

lights on when its dark

l Ideal or control o external lighting when

it is dark


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Frequently asked questions

Q Would a compact fuorescent lamp in an ordinary cap lamp

holder count as a low enery ttin in a dwellin?A No, the approved documents recommend that energy ecient

ttings only accept energy ecient lamps, bayonet cap and tungsten

halogen bases do not comply.

Q Are any orms o lihtin eempt rom Part L2?

A Specialist Process Lighting (see Denitions in L2A) is exempt along

with all emergency lighting. Portable lighting which is not xed tothe building and specialist lighting, including illuminated signs and

stage lighting, are also exempt.

Q Do the requirements o Part L apply to eistin commercial

buildins?

A Yes, i a new lighting system that serves more than 100m2 o foor

area is being installed.

Q I am re-wirin a house, will I need to install enery ecient

lihtin?

A Yes, provisions should be made or dwelling occupiers to obtain the

benets o energy ecient lighting when a dwelling is re-wired.

Energy ecient light ttings should number not less than the greater

o one per 25m2 o foor area, or part thereo, or one per our xed

light ttings.

Q Do Mk Electric supply a rane o lihtin control sensors?

A Yes, the MK Sensors range oers PIRs, Microwave Detectors,

Ultrasonic Detectors and Photocells. To request a Part L product

Guide please call 0870 240 3385 and quote MK216.


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l Your local authoritys Building Control department

l Department or Communities and Local Government

www.communities.gov.uk

l The Carbon Trust

www.carbontrust.co.uk

l Building Research Establishment

www.bre.co.uk

l ECA

www.eca.co.uk

www.partl.co.uk

Additional resourcesPart L Product Guide (MK216)

Including inormation on the MK Sensor range

and control and programming products.

l A guide to Part P (MK178)

l Part M (MK184)

l A guide to Part M (MK166)

Other resources

For more inormation visit:

Part L Product Guide


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MK ELECTRIC

The Arnold Centre Paycocke Road Basildon Essex SS14 3E A United Kingdom

Technical Helpline +44 (0)1268 563720 Fa +44 (0)1268 563064

Web www.mkelectric.co.uk E-mail [email protected]