Help needed

[lost-sole]

Ive been doing a test on a large house which used to be commericial, he still has all the storage sheds at back etc as he's a tamacer. There is a 3 phase board and a dis board running from this, the tails have been split at some point and these feed 3 more boards in the house. From the look of it he's only using 2 of the phases, it is a very complicated setup (wish i had said no to it) any way there is no rcd protection so I thought the cheapest way would be to replace the main switch in each board with a rcd BS61008, trouble is they are Merlin Gerin multi9, 2 triple pole and 2 double pole and I would need at least 80amp 30ma. Is there an alternative to use ie would square D fit this

 

[Sintra]

If you are doing a test i assume that it is a PIR.
Therfore there is no need to RCD "everyting" just note the departures from BS 7671 (2008) and code them.

Have a look here for recomendations and codes.

http://www.esc.org.uk/pdfs/business-and-community/electrical-industry/BPG4_08.pdf

 

[lost-sole]

yes it is a pir and installed to 16th edition but to just rcd sockets would mean installing rcbo's which would be more expensive, i don't want to give him anything other than code 4s thats why iam putting things right as i go along

 

[Sintra]

Ok i shall rephrase.

If it is a 16th edition installation then there is no need for RCD's on socket outlets except those that could be used for portable appliances outside the equipotential zone.

Code 4 applies to no RCD protection on socket outlets for general use, non mechanically protected cables >50mm in walls or partitions, circuits in bathrooms providing other conditions are met etc.

Have a read of the link i posted as you are giving yourself loads of extra work.

 

[lost-sole]

found some cheap rcbo's so thats the way iam going with it, i think you miss undeerstood me i meant if i didn't put things right as i went along it would have been a code 1 for having no rcd protection at all

 

[Deleted member 9648]

It would only be a code 1 if it was a TT system with a typically high Zs and no RCD protection.

 

[lost-sole]

Sorry mate meant code 2

[FONT=&quot]NO 30mAmp PROTECTION TO CIRCUITS ABLE TO SUPPLY EQUIPMENT OUTSIDE EQUIPOTENTIAL ZONE[/FONT] REG 411.3.3 still an un sat cert