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Type B time delayed rcd

Baldyhugh
Hi


As part of a job I’m currently on I have connected a single phase supply to a Danfoss variable speed inverter drive. I wasn’t aware that this would be part of the job but there you go. Anyway I connected it and powered it up and a few seconds later it tripped the rcd. I informed the installers of the drive incase it was faulty but they said that it’s probably the wrong type of rcd. I researched the spec of the drive which says that I need a type B time delayed rcd. I spoke to Hager technical dept as these are the boards I have used and they said that they only do a 4 pole B type but not time delayed. There is an A type time delayed available which is double pole but they didn’t think that it would work as it doesn’t monitor dc which the B type does. These different types are new to me so would anyone have experience of them to offer some advice?


Thanks
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  • 0
    I agree. Get the manufacturer to scratch his head on your behalf.

    BS7671 states that manufacturers instructions must be followed - everything else follows on from that.

    I had similar issue with a ground source heat pump manufacturer - given that as early as 12 months ago I was getting quotes between £450+VAT and £750+VAT for Type B/F RCDs, there was no way I was committing big money on a shot in the dark.

    So I nailed the manufacturer down to specify the precise item he required and moved on from there.

    I ended up with a Chint 80A DP Type B for £119 inc VAT.

    As for the tripping - get them in to check their inverter product - there must be some kind of warranty?
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  • 0
    I agree. Get the manufacturer to scratch his head on your behalf.

    BS7671 states that manufacturers instructions must be followed - everything else follows on from that.

    I had similar issue with a ground source heat pump manufacturer - given that as early as 12 months ago I was getting quotes between £450+VAT and £750+VAT for Type B/F RCDs, there was no way I was committing big money on a shot in the dark.

    So I nailed the manufacturer down to specify the precise item he required and moved on from there.

    I ended up with a Chint 80A DP Type B for £119 inc VAT.

    As for the tripping - get them in to check their inverter product - there must be some kind of warranty?
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