Your feedback on regulation issues

Here is the BEAMA guidance.

Here is Hager's guidance.

Here are Hager's installation instructions.


It all seems perfectly reasonable to me. The easy approach is to match the upstream OCPD with each RCD because you then do not have to consider diversity. The alternative is to do your diversity calculations (100% of the highest rated circuit + 40% of each of the rest) and select the current rating of the RCDs accordingly. Similarly, the Hager boards have integral SPD, which saves the bother of doing a lightning risk assessment.


So in fact all that Hager seems to be saying is, "Save yourself a lot of bother by fitting our CUs."


How many electricians pay much attention to the usage of each circuit? I went through this exercise when designing my step-daughter's installation - her husband wanted plenty of division in order to avoid the effects of "nuisance tripping". So the utility room sockets may at times be heavily loaded with cloths washer, dishwasher, and dryer; but the kitchen will be lightly loaded with only kettle and small appliances. It was a right old palaver, which I wouldn't want to do on a regular basis.

Here is the BEAMA guidance.

Here is Hager's guidance.

Here are Hager's installation instructions.


It all seems perfectly reasonable to me. The easy approach is to match the upstream OCPD with each RCD because you then do not have to consider diversity. The alternative is to do your diversity calculations (100% of the highest rated circuit + 40% of each of the rest) and select the current rating of the RCDs accordingly. Similarly, the Hager boards have integral SPD, which saves the bother of doing a lightning risk assessment.


So in fact all that Hager seems to be saying is, "Save yourself a lot of bother by fitting our CUs."


How many electricians pay much attention to the usage of each circuit? I went through this exercise when designing my step-daughter's installation - her husband wanted plenty of division in order to avoid the effects of "nuisance tripping". So the utility room sockets may at times be heavily loaded with cloths washer, dishwasher, and dryer; but the kitchen will be lightly loaded with only kettle and small appliances. It was a right old palaver, which I wouldn't want to do on a regular basis.