RCBO's

[davelerave]

2 radials instead of 1 ring -would be same no. of cables
but less nuisance risk

 

[cornburn]

2 radials instead of 1 ring -would be same no. of cables
but less nuisance risk

I suppose that would mean you could have twice as many circuits convering the same number of PCs so as you say, less chance of nuisance tripping as more RCBOs to share the leakage across. It would also mean you had no high integrity earthing in place though which is a requirement for any final circuit with a CPC current exceeding 10mA.

 

[davelerave]

interesting-dunno if that applies here in ROI -will check though

is a radial in steel conduit with separate cpc classified as high-integrity earthing? (steel conduit is a parallel fault path)

 

[cornburn]

interesting-dunno if that applies here in ROI -will check though

is a radial in steel conduit with separate cpc classified as high-integrity earthing? (steel conduit is a parallel fault path)

It's there in the BRB and onsite guide gives a detailed page on it if you work to the 17th still over there? Steel conduit as a separate CPC would be fine, as would running the CPC in a ring using an extra single core and terminating them both under their own screw.

 

[caddy]

Why exactly do you need to fit an RCBO to the computer circuit ? Are you doing it becuse they are 13a sockets or becuase cables are buried or some other reason?

 

[lloyd1980]

check the small red book on circuits that dont require an RCD
if its surface or visible wiring then no RCD is required, ie dado trunking or surface trunking, cables in void above suspended ceiling, you may think EVERY circuit requires an RCD but it doesnt,
check the rules and its your call at the end of the day mate
if its surface and computers I would always fit an MCB

 

[lloyd1980]

and as en example of this , when i did my NICEIC assesment, one of the jobs was a circuit totally clipped direct just doing lighting
I installed it on the non RCD side of the split board after checking the rules

the NIC guy didnt even bat an eyelid

 

[mogga]

also in general Commercial permisis dont require RCDS if they are under the supervision ie if theres a building manager,who permits work /doesnt permit work and has an understanding of the regs re cable runs ect

 

[davelerave]

thanks-i wasn't concerned with the rules requirng/not requiring rcd as i'm not working in UK

 

[KNIPEX]

check the small red book on circuits that dont require an RCD
if its surface or visible wiring then no RCD is required, ie dado trunking or surface trunking, cables in void above suspended ceiling, you may think EVERY circuit requires an RCD but it doesnt,
check the rules and its your call at the end of the day mate
if its surface and computers I would always fit an MCB

If the person plugging equipment in isnt suitably trained or comptent then u do need rcbo/rcd.

 

[caddy]

If the person plugging equipment in isnt suitably trained or comptent then u do need rcbo/rcd.

Thats the best sentance i've ever read..

 

[KNIPEX]

dunno if you are joking or serious??