meter manual final.pdf

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Energy Meter Installation

Check List

Date : 01/01/2011

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Energy Meter Installation Check List

Content:-

1) Pre-Inspection

2) Material Required/ Installation

3) CT Operated LV Metering

4) CT VT Operated HV Metering

5) Quick reference6) RSB Metering requirements and regulations

7) Illustrations

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1. Pre-Inspection

1.1 Metering network has to be pre-inspected either parallel with theLV inspection or prior to the meter installation.

1.2 During the metering network inspection, contractor presence atsite is essential.

1.3 Permanent and finalized premise identification number must belabelled on all premises.

2. Material Required/ Installation

2.1 - GRP meter cabinet with IP66 standard must be used forinstallation. I.e. outdoor and main LV room installation.

2.2 - For Villas and restricted office buildings, the meters should beoutside on boundary wall to access easily for the meter readersand maintenance team.

2.3 - Meters not allowed inside the shop, should be in electricalroom. (New Meter connections or old meters for upgrade/Shifting etc.)

2.4 - 18 mm Marine plywood required for foundation of meter

installation inside the meter cabinet. (Metal or mica sheet notallowed).

2.5 - Spacer must be provided between marine plywood and metercabinet wall.

2.6 - The height of metering board must be kept atleast 80cms fromthe ground. i.e. distance between meter board till ground level

2.7 - Maximum height of Metering board shouldnt exceed 200cm.

2.8 - 10 cm clearance is required between the meter board andmounted wall (all the sides should be covered)

2.9 - Meter cabinet or metering board must be mounted properly withC- channel or thread bar.

2.10 Metering cables both ends must be with glands. i.e. panel andmeter cabinet.

2.11 All spare breakers and future load in MDB and SMDB must bepad locked

2.12 If more than 1 no.of meter is fixed on a metering board Theremust be 10cm space vertically and 15cm space horizontallybetween the meters.

2.13 If the cable size is 16mm or below, the minimum space betweenthe cable entry and the meter base must be 10cms.

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2.14 If the cable size is 25mm or above, the minimum gap betweenthe cable entry and the meter base should be 15cms.

2.15 More than two direct meters are not allowed inside one metercabinet if the termination cable size is 25mm or above

2.16 For AMR system, colour coded cables (R-Y-B-N-E) connectedfrom main incomer of each MDB to be provided with 10 A MCBin the control cabinet and same colour coded wires are to belaid from MCB to a PVC(standard) box (300x300 mm) mountedbeside the meter. There should be a C clamp channel and

connectors inside the PVC box.

2.17 Al l the PVC (standard) boxes mounted beside the meter forAMR system in each floor of the build ing ( as mentionedabove 2.16)to be looped with PVC Conduit f rom floor tofloor and finally at Main Electric room. Control wi re with asize 0.75sqmm 4core also should be provided throughthese PVC pipes in between floor to floor. Any other type ofsuch cast iron pipes, flexible GI Pipes, normal flexible pipeetc. Would not be allowed to use expect PVC Condui t.

2.18 ForAMRcontrol cable conduit with 2YY 3 x 0.25sqmm Lapp

cable must provided from energy meter room to water meterroom.

3. CT Operated (LV) Metering

3.1 MCCB up to 630Amps for CT operated meters must haveshunt t rip facility and two single core (2.5mm) controlcables is to be laid from MCCB to metering cabinet.

3.2 CTs burden and accuracy should comply with the RSBregulations.(See the RSB manual 3.1.2 & 3.1.3)

3.3 CT must be dedicated for tariff metering no other connectionsallowed with metering CT.

3.4 Rating of CT coils for bulk meters should be same as theACB rating (Main & Check and Pi lo t Meter)

3.5 Armoured cable should be used for C.T. Meters

3.6 If the required load is more than 1MVA, provisions should bemade to install a check meter.

3.7 Pilot meter (bulk meter) provision should be provided. If one

MDB fed to individual meteringwith different Service Points(with meter cabinet )

3.8 Energy meters from different transformers / MDB / SMDBsshould not be allowed in one meter cabinet.

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3.9 1X12core 4mm2 XLPE or (3 x 4C x 4mm XLPE) cable is to beprovided for all CT operated meters wiring with identificationferrules.

3.10 1X12core 4mm2 XLPE with 1x4C x 4mm XLPE or (4 x 4C x4mm XLPE) cable is to be provided for all CT operated Mainmeter and check meters wiring with identification ferrules.

3.11 1X19 core 4mm2 XLPE or (4 x 4C x 4mm XLPE) or 1X12core4mm2 XLPE with 1x4C x 4mm XLPE cable is to be providedfor Main & check meters.

3.12 For large Service Points, where CT s installed inside MDB, acabinet should be provided inside the electrical room for thebilling and check meters.

3.13 Metering cables both ends must be gland. i.e. panel and metercabinet.

3.14 No fuse or protection breakers are allowed in the meteringnetwork ( in between source of supply and meter)

3.15 Boot legs are required to terminate the CT operated meteringconnection.

3.16 Meter cabinet and all other requirements. As mentioned in. 2.1to 2.9.

3.17 Contractor should carryout dressing all cables with suitable wirelegs and covered by cable spirals.

4. CT VT Operated (HV) Metering

4.1 Contractor submits their LDN, SLD and complete switch geardrawing to the metering section prior to the first inspection.

4.2 The site inspection must be conducted in the presence ofcontractor and switch gear engineers.

4.3 CTs burden and accuracy should comply with the RSBregulations.(See the RSB manual 3.1.2 & 3.1.3)

4.4 4 x 4C x 4mm XLPE or 1 x 19C X4mm XLPE cable should beused for metering. As mentioned in 3.9 to 3.11

4.5 Separate MCBs rated 6 Amps required for each main and checkmeters VT connection

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4.6 Main metering CT core must be dedicated for tariff metering.

4.7 Identification of CT and VT terminals should be same as shownin the As-built drawings.

4.8 Meter cabinet and all other requirements. see no. 2.1 to 2.9

4.9 Colour coded 1 x 4C x 2.5 mm cable provided from LV DB (10Amps MCB) for AMR

4.10 After the meter installation, contractor should arrange forprimary injection test in the presence of ADDC metering Dept.

Quick reference

Size ofMax

Length Burden

Type of Meter

Cable to

meter of Cable C.T Ratio VA Accuracy Load in KW100 / 5 A - CT meter 4 mm2 13 100 / 5 A 5 0.5 Maximum 55 KW

200 / 5 A - CT meter 4 mm2 28 200 / 5 A 10 0.5 Maximum 110 KW





2000 / 5 A - CT meter 4 mm2 42 2000 / 5 A 15 0.2 Above 800 KW

2500 / 5 A - CT meter 4 mm2 42 2500 / 5 A 15 0.2 Special cases

3000 / 5 A - CT meter 4 mm2 42 3000 / 5 A 15 0.2 Special cases

4000 / 5 A - CT meter 4 mm2 42 4000 / 5A 15 0.2 Special cases

1 Phase Direct Meter Maximum size of cable 25mm2 Maximum 9 KW

3 Phase Direct Meter Maximum size of cable 25mm2 Maximum 52 KW

2000 / 5 A ACB rating up to 2000 A Transformer 1500 kVA

2500 / 5 A If ACB rating 2500 A Transformer 1500 kVA

3000 / 5 A ACB up to 3000 A Transformer 2000 kVA

4000 / 5 A If ACB 4000 A Transformer 2000 kVA

4000 / 5A If ACB rating 4000 A Transformer 2500 kVA

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(RSB requirements)

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Enclosures @ Main Electrical Room

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Individual Meters for apartments

AMR - Bridge box located on the wall in the main electrical room.

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Water meters located in a water meter cupboard

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Typical installation - new and existing low-rise buildings

(Commercial villas)

3 core meter data cable

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ADDC

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