Dont you just love RCDs !!

[sythai]

I'm after a crabtree starbreaker D6 MCB.... any ideas please ? Tried a few wholesalers that I use with no joy

Cheers Sy

Not sure whats going on with the title of my post - "Dont you just love RCDs!!" (was a previous posts title) Should read "Crabtree Starbreaker MCB"

 

[spark 68]

Glenn,
Why would he have to watch his Zs ?, surely this circuit would still have to have 30mA RCD protection if he is making changes to the OCPD ?

BTW Iam aware of the lower Zs required for D type MCB's.

Just asking

 

[GLENNSPARK]

Glenn,
Why would he have to watch his Zs ?, surely this circuit would still have to have 30mA RCD protection if he is making changes to the OCPD ?

BTW Iam aware of the lower Zs required for D type MCB's.

Just asking

well do you think it prudent to rely on an RCD alone?....like a TT system?.....thats whats being advocated here.....

 

[spark 68]

well do you think it prudent to rely on an RCD alone?....like a TT system?.....thats whats being advocated here.....

Not at all,

he is going to be no where near the much criticised magic 200 ohm (1667 ohm) number though is he ?

 

[GLENNSPARK]

Not at all,

he is going to be no where near the much criticised magic 200 ohm number though is he ?

the thing here as well is short circuit...i just dont like the idea of relying on additional protection alone on the basis of using a d type when a c type would probably hold........

 

[spark 68]

the thing here as well is short circuit...

A 6A B type or D type is still 6A regardless, only the max Zs has changed for the disconnection time, if it complied for a B-type before then it still complies now in this respect (Short circuit).

if his Zs is say 2 ohms (for instance) then his 30mA RCD will mitigate this, not rely soley on RCD protection.

 

[sythai]

Checked Zs today well under (and will be on an RCD anyway.)

This has turned out to be a very expensive light fitting, did try and suggest we try 'C' type first but customer is set on going straight for 'D' type as per fitting instructions:

Cost of light fitting (prob around £200 'ish? does look rather nice)

+

Split tails (right pain in the butt as incomer is about 6m away and they come into the existing CU from behind) / mini cu / move lighting circuit across / test = £250+vat

Oh well not moaning another job for the list :rolleyes2: