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heat pumps and dual RCD boards new install

Newfutile

we have come across  heat pumps on type A dual (RCD) Residual Current Device boards.

BS7671 does not seem to saying anything on heat pumps, the heat pumps seem to have variable frequency drives.

is this a danger considering blinding may now mean half the property could have a blinded rcd and therefore no additional protection?

would it be reasonable to expect heat pumps to have its own double pole type B HP rcd ,will BS7671 be ammended to include what is likely to become a bigger problem as more are fitted?

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    Generally, any HP install I do has a separate small DB, fed via a circuit breaker in the main DB. Of course with spilt load boards that may not be possible, so new tails to feed it via Henly style connector blocks.

    I havent done one for around 8 months, but was using Fusebox Type B RCDs, around £160 for the RCD and box. Two pole, and fit all the requirements. Or so I thought. Fusebox have now said they are not suitable for HP use.

    Here is an extract from an email from them:

    "HPs must be installed with a Type B RCD rated to 20kHz or greater, and with a minimum trigger point of 150mA above 1kHz. Unfortunately Fusebox RTB630302M & RTB630304M do not currently meet this criteria. For any further enquiries please do not hesitate to ask."

    Now, they are not offering any compensation for those that have fitted them, and dont offer any clue as to why they do not meet the (presumably?) BS/EN standards. They also dont state what the failure mode is on the ones they were selling as suitable for use.

    So, how do we know if a RCD is suitable for use, as I only required a Type B RCD, it was sold as a Type B, but, apparently, it does not meet the required standard.

    Is this a failure to adhere to the standards that apply to RCD production, or are they supplying inferior products?

    So many questions, and very few answers.

    Hager have started to do a Type B recently, so I think I'll be buying that next time, but how do I know their offering will comply with the relevant standards?

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    Generally, any HP install I do has a separate small DB, fed via a circuit breaker in the main DB. Of course with spilt load boards that may not be possible, so new tails to feed it via Henly style connector blocks.

    I havent done one for around 8 months, but was using Fusebox Type B RCDs, around £160 for the RCD and box. Two pole, and fit all the requirements. Or so I thought. Fusebox have now said they are not suitable for HP use.

    Here is an extract from an email from them:

    "HPs must be installed with a Type B RCD rated to 20kHz or greater, and with a minimum trigger point of 150mA above 1kHz. Unfortunately Fusebox RTB630302M & RTB630304M do not currently meet this criteria. For any further enquiries please do not hesitate to ask."

    Now, they are not offering any compensation for those that have fitted them, and dont offer any clue as to why they do not meet the (presumably?) BS/EN standards. They also dont state what the failure mode is on the ones they were selling as suitable for use.

    So, how do we know if a RCD is suitable for use, as I only required a Type B RCD, it was sold as a Type B, but, apparently, it does not meet the required standard.

    Is this a failure to adhere to the standards that apply to RCD production, or are they supplying inferior products?

    So many questions, and very few answers.

    Hager have started to do a Type B recently, so I think I'll be buying that next time, but how do I know their offering will comply with the relevant standards?

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