I personally think the main question (in addition to cost) about AFDDs in domestic installations is whether they are in any sensible sense 'needed', on any circuit (not just 6A ones)!Apart from cost, why not?
Kind Regards, John
I personally think the main question (in addition to cost) about AFDDs in domestic installations is whether they are in any sensible sense 'needed', on any circuit (not just 6A ones)!Apart from cost, why not?
Has he explained benefits of spd's and affd's?
Maybe, but I would personally think that such would be an extremely rare type of fault, and an even more extremely rare cause of "extremely serious consequences". Apart from anything else, a cable fault which resulted in series arcing would presumably usually become rapidly apparent due to malfunction of the circuit. So, like you, I personally would certainly not perceive a need for AFDDs in my own home!.... A few months later the cable failed, and I found the cable was badly burnt at the tight right angle. .... But it seems this must have been due to series arcing caused by my mistreatment of the cable.
... That is the only occasion in many years of work that an affd might have tripped due to a fault created by me. A fault that could have had extremely serious consequences.
He should carry out a full test before replacing the CU, this to rectify any faults that may effect operation of RCBO's.
Has he explained benefits of spd's and affd's? NB affd's might need one extra module space per affd
The price seems ok.
Wow that would soon add up! Seem good though.AFFD's are about £150 per circuit. (though you don't tend to fit them on the small 6A circuits)
A fusebox brand probably comes with an SPD
Where work is to extend or modify existing circuits, costs quoted assume that the existing installation is in adequate condition and complies with minimum current regulations. Any works found required to bring the necessary parts of the existing installation up to standard will be at additional cost.
Seems fair and appears to be from a standard T&C pack.
Make sure they're Type A and not crappy Type AC also.Yeah we discussed SPDs and agreed they would be fitted. The fusebox one does have one fitted and believe it also has a dedicated MCB for the SPD. I will check about circuit checks, his T&Cs do say:
Where work is to extend or modify existing circuits, costs quoted assume that the existing installation is in adequate condition and complies with minimum current regulations. Any works found required to bring the necessary parts of the existing installation up to standard will be at additional cost.
Seems fair and appears to be from a standard T&C pack.
I was also going to check whether I should get the DP versions as they are £4 more each and help with full circuit isolation I guess without having to use the main isolator?
Yeah saw they are only a little bit more for A which seems worth it.Make sure they're Type A and not crappy Type AC also.
We haven't fitted Type AC for many years now. Frankly they should be banned in this day and age.Yeah saw they are only a little bit more for A which seems worth it.
Quite so - and whoever started this practice/fashion of using "Type" to refer to two totally different characteristics of an RCD/RCBO (which results in total ambiguity with "Type B") probably deserves to be shot!I think there are a fare few sparks out there (in UK) who don't know what a type AC or A RCD is.
And even if he does, he may not expect a layman to know.
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