minor works

[m1ck_b87]

Hi all
Am I right by saying what ever I add to a circuit has got to comply with 17th even if the existing circuit doesn't ie if I come off socket circuit that has no rcd protection that socket I put in has to have rcd protection

 

[telectrix]

correct. but sometimes it's better to RCD the whole circuit.

 

[m1ck_b87]

What if I'm coming off bathroom light to supply a bathroom fan and the circuit has no rcd prtotection but the fan I'm installing has a rcd fused connection unit. Will this be ok if there's supplementary bonding in place

 

[dave274]

the cable also needs rcd protection unless its surface mounted, deeper than 50mm or in metal conduit.

 

[telectrix]

not as long as FCU is sited in a suitable location and you don't fall foul of 522.6.101 ( cables buried in walls.....)

 

[m1ck_b87]

No apparently the cable is within a bathroom so it has to have rcd protection even if its in trunking because its part of the circuit, so if it doesn't have rcd protection and only supplementary bonding it will still comply won't it

 

[dave274]

all circuits in a bathroom need rcd protection. no rcd no compliance.

 

[m1ck_b87]

What if there's supplementary bonding it doesn't require rcd does it

 

[markythesparky]

Hi all
Am I right by saying what ever I add to a circuit has got to comply with 17th even if the existing circuit doesn't ie if I come off socket circuit that has no rcd protection that socket I put in has to have rcd protection

if you run the cable in the wall structure, the cable must have RCD protection too. therefore it is better to add an RCD at the beginning of the circuit.

 

[markythesparky]

What if there's supplementary bonding it doesn't require rcd does it

any circuits in a bathroom require RCd protection. supplementary bonding is not requires if there is rcd protection, not the other way around.

 

[telectrix]

not quite.

all LOW VOLTAGEcircuits in a bathroom need rcd protection. no rcd no compliance.

 

[m1ck_b87]

If your bathroom has supplementary bonding then you don't need rcd but the cable between the light and rcd fused spur will not be rcd protection so if there's supplementary bonding will this still comply need answers people my heads in bits arrgghhh

 

[telectrix]

the easiest way would be to RCD the lighting circuit or fit the RCD FCU in the loft before the bathroom light. (3a fuse to comply with manufactures instructions (for the fan))

 

[Geoffsd]

What if there's supplementary bonding it doesn't require rcd does it

What a good (bad) example of regs. being misunderstood.

Because supp bonding may be omitted when RCDs (with other conditions) are in place

does not mean that RCDs may be omitted if supp bonding is in place.

 

[markythesparky]

If your bathroom has supplementary bonding then you don't need rcd but the cable between the light and rcd fused spur will not be rcd protection so if there's supplementary bonding will this still comply need answers people my heads in bits arrgghhh

No! you need RCD protection. you don't need supplementary bonding if there is RCD protection, not the other way around.