AJJewsbury:
As the type (AC, A, B, etc) describes the type of residual waveform the RCD will recognise (and/or be disabled by) then logically they apply to all types of RCD (although conceivably other standards may describe the same thing differently).
But given that the 18th Ed seems not to recognise RCD sockets and RCD FCUs (to BS 7288) any more (only BS EN 61008 series, BS EN 61009 series and BS EN 62423 are listed as acceptable, at least in installations used by ordinary persons) then it might be a mute question anyway.
- Andy.
mapj1:
or moot if we believe the reg writers really intended this, - but not a daft question to ask in any case .
Most plug in RCDs for example are designed as AC type, but do still respond to lumpy DC (as A type) but need rather more of it to trip them.
AJJewsbury:
As the type (AC, A, B, etc) describes the type of residual waveform the RCD will recognise (and/or be disabled by) then logically they apply to all types of RCD
I would be interested to know of any manufacturers willing to declare that their product will disable probably the most widely used general type AC RCD :)
AJJewsbury:
I would be interested to know of any manufacturers willing to declare that their product will disable probably the most widely used general type AC RCD :)
In terms of manufacturer's declaring that their product is intended to disable an RCD the only one I can think of are the loop testers with the old 'D-Lok' function (but that at least does demonstrate the underlying physics).
I think in terms of ordinary appliances I think it's more of a case of the industry gradually realizing that there's a problem that even fault-free RCDs might not trip when they should, rather than appliance manufacturers jumping up and down to draw anybody's attention to the fact. EVSE equipment manufacturers are probably the most open at the moment.
- Andy.
Farmboy:
Regarding RCD types, AC, A, F, etc. Do these classification/types apply only to RCD's installed in CU's/DB's, or to RCD's incorporated in RCD sockets and fused connection units as well? A manufacturer is getting back to me about their products later in the week, and I'd like to have something to compare their answer to.
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