Discuss MCB, RCD & AFDD all in one in the Electrical Forum area at ElectriciansForums.net

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commercial only for them ,you want be putting them in domestic ,it would be the film jaws ,we need a bigger consumer unit or bigger boat .;)

No requirement to install in domestic. Only high risk areas such as flammable sites, places of historic importance and areas with high public usage.
 
For anyone who’s not seen the regulation covering these AFDD’s it’s as follows;

421.1.7 arc fault detection devices conforming to BS EN 62606 are recommended as a means of providing additional protection against fire caused by arc faults in AC final circuits.
If used, an AFDD shall be placed at the origin of the circuit to be protected.
NOTE: Examples of where such devices can be used include:
•premises with sleeping accommodation
•locations with a risk of fire due to the nature of processed or stored materials, ie B2 locations (e.g barns, woodworking shops, stores of combustible materials)
• locations with combustible construction materials i.e. CA2 locations (e.g. wooden buildings)
• fire propagating structures i.e. CB2 locations
• locations with endangering of irreplaceable goods.
 
'premises with sleeping accommodation' is a bit ambiguous, though. I'm assuming they mean hotels?
 
Recommended is too ambiguous to cause me any concern, by the time the reg becomes mandatory they will have tumbled in price and be the size of a single rcbo. Next!
 
Seems these things are elusive.

Eaton are quoting £160 per combined unit and a 16 day lead time.

They also do not do 3 phase units.

??????
 
Seems these things are elusive.

Eaton are quoting £160 per combined unit and a 16 day lead time.

They also do not do 3 phase units.

??????
Also according to the NIC presenters, ADDS will not work on a RFC, they didn't give a very good explanation on the film they produced, but the fact that AFDDs won't work on a RFC according to them was something that stuck in my mind.
 
Perhaps they work by detecting the gaps in the flow of current caused between arcs.
An RFC would have the gaps in current on one conductor filled in by the current flow on the other conductor.
 
They will work on parallel arc faults on an RFC but won’t detect a series fault on the ring itself although they will detect both types of arc on any equipment connected to the ring or spurs etc as there is no additional leg to compensate.
 

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