Scenario for use

[marco86]

You are testing a clients house and the kitchen and bathroom lights are wiring in 1.5mm twin and earth.

The bathroom (x 6) and kitchen (x8) have down lights. The cpc have been chopped away due to the installer not being a spark and noticed there was no termination point at the light? So between each downright the cpc has just been chopped.

What would you code it as?

 

[Richard Burns]

If there is no termination point at the fitting then they must be class II fittings so a C3, cpc not run to and terminated at each point 411.3.

 

[telectrix]

agree^^^^^^^.

 

[Pete999]

What they both said ^^^^^^^^^^^^^^^^^^^^^^^^:wheelchair:

 

[marco86]

What about installing a new smoke alarm circuit into a rewireable fuse board, cables pass through the ceiling and clipped direct to joints in attic.

Would you say that the db requires changing so that cables are rcd protected ??

 

[Spoon]

What about installing a new smoke alarm circuit into a rewireable fuse board, cables pass through the ceiling and clipped direct to joints in attic.

Would you say that the db requires changing so that cables are rcd protected ??

Which is cheapest, replacing an old CU with a modern one or adding a small CU with RCD and leaving the existing CU alone?

 

[andyb]

Why does it need rcd protection?

 

[DPG]

Why does it need rcd protection?

New circuit with cables buried <50mm on their way to the attic presumably. Daz

 

[DuaneMHunt1976]

New consumer unit as needs RCD as at some point it will be in wall/partition

Or
"Preferably supplied from local, regularly used lighting circuit. (there should be a means of isolating the supply to the alarm without switching off the lighting)"
Also
"be linked so that operation of one will initiate all"

 

[andyb]

New circuit with cables buried <50mm on their way to the attic presumably. Daz

You're probably right, he doesn't mention that though.
That's why I asked.

 

[DPG]

New consumer unit as needs RCD as at some point it will be in wall/partition

Or
"Preferably supplied from local, regularly used lighting circuit. (there should be a means of isolating the supply to the alarm without switching off the lighting)"
Also
"be linked so that operation of one will initiate all"

Doesn't necessarily need a complete new consumer unit though. Other methods are available, such as Spoon's suggestion. Daz

 

[DuaneMHunt1976]

I suggested it as the cost of new units being so cheap before the change

 

[DPG]

The consumer unit may be fairly cheap, but the labour costs of installing and testing it won't be. And any faults and issues which come to light will also need sorting. Could work out as a very expensive new smoke alarm! Daz

 

[DuaneMHunt1976]

i did give TWO suggestions, think the other suggestion is from the Building Regs onsite guide

Every thing has COSTS and DIFFERENT ways of doing things, the two i suggested
were down to my thinking the Cost of the Smaller CU with a RCD was dearer than the suggestion out of the building regs, the Full CU i figure maybe a bit dearer but would help with the RE-wireable Fuses and being up to date with RCD, the CUs are cheaper at the moment, a House with a Reasonably NEW CU is better to be sold than one with a OLD Re-wireable Fuse one as the looks of it would scare people off, but im sure coffee might fix the problem as the smell dose help to sell houses i hear.