ekas 2.1.5.1 power cable and conductor terminations

EKAS 2.1.5.1Power cable and conductor terminations

UEE31307 Certificate III in Refrigeration and Air Conditioning

Stage 2A Units: UEENEEPOO1B

Chris Hungerford4/21/23

Functions of a cable gland• Hold the cable into positions so that no undue

mechanical stress is placed on the terminations.• Limits the spread of fire.

Cable glands can be designed to perform these functions:

»Dust protection»Water tight seal.»Explosion protection.»Vermin proof.

2.1.5.1.A

Cable Glands• General Purpose Weatherproof

Glands for Armoured Cable

• General Purpose Weatherproof Glands for Unarmoured Cable

• Cable Glands for Braided EMC Shielded Cable

2.1.5.1.A

• PVC Cable Gland Shrouds

• Metal Locknuts

• Metal Earth Tags

• NYLON CABLE GLANDS (IP68)

Cable Glands

2.1.5.1.A

AS/NZS-3000:2007, SAA Wiring Rules3.7 ELECTRICAL CONNECTIONS3.7.1 GeneralConnections between conductors and between conductors and other electrical equipment shall provide electrical continuity and adequate mechanical strength.

2.1.5.1.B

Solderless lugs

Ross - Courtney lug.

Stanco lug

2.1.5.1.B

Crimps

Terminating - crimp lugs.

Joining cables of the same size - crimp links.

When crimping it is important that the correct crimp type lug for the cable and the correct tool for that lug is used.

AS/NSZ 3000 cl 3.7.2.3.2

2.1.5.1.B

Terminal connections

AS/NZS 3000 cl 3.7.2.4

Blue point connectors (BP)

Line taps.

Articles terminals.

Terminal strips.

Bolted & clamp connectors

2.1.5.1.B

AS/NZS-3000:2007 SAA Wiring Rules

3.7.2.7 Soldered connectionsWhere a soldered connection is used the design shall take account of creep, mechanical stress and temperature rise under fault conditions.

2.1.5.1.B

Conductor colouringAS/NZS 3000 Table 3.4

Function Colour

Earth/bonding Green/yellow

Neutral BlackRed Brown, dark Blue, Grey, White, any colour other than green/yellow, green, black, yellow or light blue

ActiveLight blue

2.1.5.1.C

Stripping of Insulation.• Avoid using a knife on smaller cables.• Tear the insulation off, don’t cut.• Do not indent any conductor material.• Be sure not to remove excessive insulation.• Remake any damaged insulation.• The only connection for an extension lead is

via an approved plugtop and socket.

2.1.5.1.C

3.7.2.2 Preparation for connectionThe insulation on a conductor shall not be removed any further than is necessary to make the connection.

For connections between insulated conductors the connection shall be insulated to provide a degree of insulation not inferior to that of the conductors.

Any damaged insulation shall be reinstated.

AS/NZS-3000:2007 SAA Wiring Rules

2.1.5.1.C

Insulation of conductors

Yes

• Electrical insulation tape

• Epoxy kits

• Heat shrink

No

• Masking tape

• packing tape

• sticky tape

• silicon mastic

2.1.5.1.C

3.7.2.6 Mechanical stressAll cables and conductors shall be installed so that there is no undue mechanical stress on any connection.

AS/NZS-3000:2007 SAA Wiring Rules

2.1.5.1.C

3.7.2.3.1 Loosening of connections

Connections shall be made so that no loosening is likely because of vibration, alteration of materials or temperature variations to which the connectionsare likely to be subjected in normal service.

AS/NZS-3000:2007 SAA Wiring Rules

2.1.5.1.C

Terminations and connections

• Connections must not be soft soldered before compression terminations.

• Must be seated correctly.• Free of dirt and oxides.• Use a suitable lug or connector.• Insulated to the equivalent of the original

insulation.• Earth connection must be painted if

exposed to weather

2.1.5.1.C

Further readings

Questions Topic 7 Q1-Q23