MCB, RCD & AFDD all in one

[rapparee]

That’s a voltage tester?

That’s a voltage tester?

It has a built in gfci tester.

 

[Deleted member 26818]

It has a built in gfci tester.

Yes so have some of those Martindale type socket testers.
I thought it was a link to an AFDD tester?

 

[Nigel]

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.

 

[Nigel]

I think I must be getting confused!
I thought these AFDDs were nothing more than surge protectors?

They measure arc faults. The clue is in the name haha

 

[Wes1000]

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.

 

[Rockingit]

'premises with sleeping accommodation' is a bit ambiguous, though. I'm assuming they mean hotels?

 

[Wes1000]

'premises with sleeping accommodation' is a bit ambiguous, though. I'm assuming they mean hotels?

Or is it aimed at blocks of flats too??

 

[Toneyz]

Notice the word RECOMMENDED I wonder if that will change with the amendments.

 

[Toneyz]

'premises with sleeping accommodation' is a bit ambiguous, though. I'm assuming they mean hotels?

That's my take on it.

 

[Wes1000]

I thought it was going to be beefed out in the next amendment. Only what I heard though.

 

[Rockingit]

Or is it aimed at blocks of flats too??

May also make sense since Grenfell but then you'd have thought they'd listed BMO's

 

[rolyberkin]

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!

 

[Nigel]

That's my take on it.

I agree. Blocks of flats are dwellings. Not sleeping accommodation.

 

[Wes1000]

Flats and HMO etc will be saved for the next book then?

 

[Nigel]

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.

??????

 

[Pete999]

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.

 

[EalingBadger]

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.

Can anybody throw any further light on this?

It seems a crazy limitation.

 

[Deleted member 26818]

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.

 

[EalingBadger]

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.

Ah, yes. Good point. Obvious when one gives it the merest moment of thought.

 

[Wes1000]

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.