Discuss rcd b type in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

M

matt sparks

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have just changed a c type mcb for a btype rcd. asked /ordered a c type but got the b instead and installed without noticing, i know i should have checked, but it was late out of hours....... we all know the score, it is looking after a small kitchenette with a couple of sockets fridge dishwasher microwave water cooler in factory will this be ok when it comes to testing, this job has been a nightmare!
 
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S

Spudnik

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  • #2
Should be ok but you should make sure your Zs complies with the new b curve RCBO.

Also, you may want to make sure that there are no external compressors for fridges etc on that circuit as the start up may take out a B type.
 
G

Guest123

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  • #3
It should be absolutely fine matey.

The max Zs for a B type is higher than that for a C type and providing it's suitably rated for overcurrent protection aswell then I forsee no problems at all.

Cheers.:D
 
M

matt sparks

  • Thread Starter Thread Starter
  • #4
thanks chaps, for a circuit so small and for a room the size of a shoe box this has been a pain in the arse, but thanks for the quick response!
 
have just changed a c type mcb for a btype rcd. asked /ordered a c type but got the b instead and installed without noticing, i know i should have checked, but it was late out of hours....... we all know the score, it is looking after a small kitchenette with a couple of sockets fridge dishwasher microwave water cooler in factory will this be ok when it comes to testing, this job has been a nightmare!
Why did you want to fit a type C mcb when if the circuit is as you describe a type B would seem to be more appropriate?
 
S

Spudnik

  • Thread Starter Thread Starter
  • #6
Seems to me that the original MCB was a c type and therefore was going to replace with a C type RCBO.

I'd probably do the same but, yes, the b type would be fine tho.
 
M

matt sparks

  • Thread Starter Thread Starter
  • #7
the client wanted it changed from mcb to rcd was going to put in a c type rcd but a b type turned up, have to use it for now, but dont want to change it if it will do. and thanks for the replies chaps.
 
S

Spudnik

  • Thread Starter Thread Starter
  • #8
Matt,

As Mr Loon pointed out, the only time you should be a bit careful is if you are going from a B to a C type as the Max Zs for the circuit concerned is lower with a C than a B.
 

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