crabtree 60947-3 queery

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andyman 72

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i have a question i hope somebody can help me with. i am using a crabtree 60947-3 main breaker and i have checked in bs7671 and it states that all breakers used in domestic consumer units must be double pole. the crabtree 60947-3 does not have the added bs number listed in bs7671 and states single pole on it. now when i questioned crabtree about this they sent me the details stating that it is a single pole breaker with a switched nuetral???????? to me this is a double pole switch is it not???????? whot are they trying to cover there arses on????? i have tried the breaker with cross polarity and it does break both poles. can anyone clarrify if this is acceptable to bs7671 standards or not as i am a bit confused about the " single pole with switched nuetral" on a single pole devise. thanks for any answers you can give

:Spam

 
a 60947-3 is generally a DP isolator. it does not have any fault or overcurrent detection, it is just a switch. and it complies with 7671 for isolation

 
i know but in the regs it states that the 60947-3 is only double pole if it has the bs number wich the crabtree doesnt? confusing i know but if it was double pole then surely crabtree would have put that on it not single pole. as it states also in the regs that a consumer unit in a domestic property should be double pole........mmmmmmmmmmm

 
Are you using a C/tree 100/SP1 or a C/tree 100/M12 ? The first one is a single pole switch disconnector , the second is a double pole switch disconnector ,. Both comply with BS EN 60947-3 . I'm concerned by your use of the word " Breaker". As Andy says this is only a switch !!!

Deke

 
it is the 100/sp1. as you say it is a single pole disconnecter but it does state in the regs that in a consumer unit that is operated by the public then it must disconnect all live conductors. as the neutral is a live conductor then if it doesn't disconnect it then how can it comply to the regs?

 
I would agree with you on that. If you have a C/tree 100/SP1 how come it has two poles ? I'm confused ! I don't even know why they bother to make a single pole switch TBH ! I think I'd sling that and fit a DP switch TBH.

 
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