rcd help

[bobbuild]

hi, could anyone please advise me if:
i can take a feed from a spare mcb in fuse box to an rcd mounted next to it, or must i take the feed from meter tails?

i need to add some sockets to a kitchen and there is no rcd protection,
so i need to rcd the ring and not sure on how i can achieve this...

 

[Guest123]

If there's room for an MCB in the dis board why not just fit an RCBO to cover the new circuit instead??

Job done.

 

[kung]

hi, could anyone please advise me if:
i can take a feed from a spare mcb in fuse box to an rcd mounted next to it, or must i take the feed from meter tails?

i need to add some sockets to a kitchen and there is no rcd protection,
so i need to rcd the ring and not sure on how i can achieve this...

remove the mcb and replace with a rcbo. neater job.

If there's room for an MCB in the dis board why not just fit an RCBO to cover the new circuit instead??

Job done.

dammmm you beat me to it lenny

 

[bobbuild]

ah yes but is it ok to run a cable from mcb to rcd or must rcd be at origin (cant get rcbo for this old board)
and if so how would i add this rcd into ring ie:
30a breaker with 6mm to 40a/30ma rcd and ring run out from this?

 

[Guest123]

A better job may be to get hold of a "garage consumer unit" (screwfix)that has a 40A 30mA RCD and usually 16 and 6A MCB's. Take out the 16 and 6 A MCB's, fit a 20 or 32A MCB depending if you are ringing or radialing and feed this board off of the old one.

This way you get better overcurrent protection aswell as fault protection

Cheers.

 

[bobbuild]

ah great so just to clarify my point if you dont mind,

it is ok to take a cable from a existing mcb and feed into an rcd as i was not sure if it would need to enter the rcd first

 

[kung]

i agree with lenny better way to rectify problem was thinking shower cu 30ma same thing though

 

[bobbuild]

so from a 30amcb in fuse box run cable (size?) to a 63a/30ma shower enclosure with 30a mcb and run ring from there?

 

[Guest123]

Providing everything is up to standard i.e earthing & bonding and you wont be overloading the main fuse by adding another circuit to the installation then it should be fine.

What I would say though depending on if you go for ring or radial is rather than 6mm or 10mm T+E say, use tails and same size earth that way all conductors are big enough to cope with whatever.

Cheers.

 

[kung]

yep also remember to do your checks/tests to confirm rcd in ad cu is working as should.

 

[kevinreilly]

Splitter blocks, tails,rcbo unit. (Proper job!)

 

[Guest123]

Upgrade existing c.u altogether with scope for future expansion. (PROPER JOB)

 

[Tiger]

In an ideal world yes. but if the customer's not willing to pay for the upgrade possible faults on existing circuits that would need rectifiying. It's never easy

 

[mrloy99]

hi, could anyone please advise me if:
i can take a feed from a spare mcb in fuse box to an rcd mounted next to it, or must i take the feed from meter tails?

i need to add some sockets to a kitchen and there is no rcd protection,
so i need to rcd the ring and not sure on how i can achieve this...

nothing wrong with your origional idea-6mm from your mcb/fuse,to 30maRCD,ring out. Cheapest way. no reason your rcd has to come before fuse.

 

[ezzzekiel]

yeah spot on if cust not up for payment
so what is rules for using stand alone rcd, i can design and calculate circuit but not sure how this incorpoated on testing