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Posted By Topic: Lighting extensions, light point on existing home

codaxx
May 09 2018 13:53

Hey Team,

Got a job where customer wants new lights put in with metal bases etc. Lucky for her, 2C+E tripple plated to light fittings so earth already exists.

Question is, if i am extending final subcircuits e.g adding new lighting points, the lights are tripple plated e.g feed goes to fittings first, then at the light switch you have the two single cores being switch returning to fitting. Would i need to take the 2C+E feed back light switch and the run the 2C+E control to lights?

Reading through the standard,
2.6.3.4 - no RCD protection needed
5.4.3 - earth points needed at lighting points.

The fact is that there is no earth at the light switch due to tripple plating.

Cheers
   

pluto
May 09 2018 14:15

codaxx May 09 2018 13:53

your comment 1,

Got a job where customer wants new lights put in with metal bases etc. Lucky for her, 2C+E tripple plated to light fittings so earth already exists.

My comment 1 a check to make is the eaerth sire connectaed at all termionations back to the switchbord providing the supply?

Your comment 2
Question is, if i am extending final subcircuits e.g adding new lighting points, the lights are tripple plated e.g feed goes to fittings first, then at the light switch you have the two single cores being switch returning to fitting. Would i need to take the 2C+E feed back light switch and the run the 2C+E control to lights?

My comment 2 NO
All the standard requires ia an earth at each lighting point or at the ELV transformer 9id applicable).

Your comment 3
Reading through the standard,
2.6.3.4 - no RCD protection needed
5.4.3 - earth points needed at lighting points.

The fact is that there is no earth at the light switch due to tripple plating.

My comment 3
The standard is silent on the need for an earth at the light switch. For switch fittings SOME but NOT ALL may require an earth for a metallic flush plate over the switch fitting.
   

DougP
May 09 2018 14:49

Simple answer.

You are correct.

Do the normal tests on the circuit for earth continuity. (especially to check that it isn't just connected to a neutral somewhere)
   

DougP
May 09 2018 14:53

Just to clarify. No you don't need to take the 2c+e to the switch, if you prefer to triple plate. There's no requirement to have the earth at the switch.

But often it is just easier to just run the feed to the switch, then out to the light.
   

codaxx
May 09 2018 16:00

Cheers guys.

The 2C+E definetly runs back to the board but of course will confirm with the tests.
The only real upgrade i see is changing the SERF to the plastic push in and then i am able to extend the cables.

Thanks again for clearing it up, i always run back to the switch and then control to the fittings but i guess old school is just as good