UK RCOCB BS 4293

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Discuss RCOCB BS 4293 in the UK Electrical Forum area at ElectriciansForums.net

banny07

banny07

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Hi Guys.
I went to see a job today where customer wanted to replace front plate of sockets and switches. Switches has no cpc but cpc is present in the cieling roses. As I opened consumer unit the main switch was 80A 2 pole RCOCB bs 4293 which has 100mA rated tripping current and 2000A breaking capacity. My question " Is it acceptable in dwellings". customer doesn't want to upgrade consumer unit. Please advise . Thanks in advance
ccu4.jpg
ccu2.jpg
 
The switch drops may be contained in steel conduit which may in fact be the CPC. Worth getting the tester out to check. If not, then it may be possible to pull in a separate CPC.
If that is not possible, then replacing plastic switches for metal ones would be introducing a potentially dangerous situation.

The 100 mA main switch RCD does not provide additional protection where it is required, eg for sockets used for equipment outdoors. I would be reluctant to take on any changes at all in this situation.
 
nevertle less, you are modifying alighting circuit, so 30mA rcd protection must be provided.
1. for luminaires in a domestic, and
2. for cables buried in walls <50mm .

3. CYA when the shyte hits the fan. judge.
 
telectrix said:
nevertle less, you are modifying alighting circuit, so 30mA rcd protection must be provided.
1. for luminaires in a domestic, and
2. for cables buried in walls <50mm .

3. CYA when the shyte hits the fan. judge.
Click to expand...

Its like for like replacements, not modifying the circuit... so BS7671 doesnt usually apply.
Of course, it would be better to upgrade.

changing plastic to plastic is not making the installation "less safe" than it is now. whereas plastic to metal would
 
littlespark said:
Its like for like replacements, not modifying the circuit... so BS7671 doesnt usually apply.
Of course, it would be better to upgrade.

changing plastic to plastic is not making the installation "less safe" than it is now. whereas plastic to metal would
Click to expand...
as i read OP, customerwants to replacefaceplates.i assume this would be for metal, although not specified in OP.
 
loz2754 said:
The switch drops may be contained in steel conduit which may in fact be the CPC. Worth getting the tester out to check. If not, then it may be possible to pull in a separate CPC.
If that is not possible, then replacing plastic switches for metal ones would be introducing a potentially dangerous situation.

The 100 mA main switch RCD does not provide additional protection where it is required, eg for sockets used for equipment outdoors. I would be reluctant to take on any changes at all in this situation.
Click to expand...
Sorry I forgot to mention it is first floor flat. It is mixed of conduit and pvc trunking . They put coving on top of trunking so its lid is not possible to remove.
 
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