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Type A R.C.D. 6mA tolerant.

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Can I really be confident in the use of a Type A R.C.D. that will tolerate up to only 6mA D.C. current and still operate?

I have a box of old Pifco torch bulbs as used in battery motorists' lanterns. They are filament bulbs rated at 6.2V 0.5 Amp. Their current draw is 500mA. And that for a not very bright torch bulb. That current is supplied via dry cells.

So, the Type A R.C.D.s can only work reliably with a D.C. current of up to 6mA. That is a piddly low current.

Comments please.

Z.

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    The thing that most confuses me is blinding in relation to selectivity. For example will a type A (or “better”)  trip at low enough DC currents such that an upstream type AC won't be blinded by DC currents low enough to be passed?

    For a practical example: in a TT system, if an EV charger circuit is protected by a type B, can an upstream time delayed RCD (which guards the whole house, along with RCBOs on each circuit) be type AC, or does it need to be type A or type B, or what?

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  • 0

    The thing that most confuses me is blinding in relation to selectivity. For example will a type A (or “better”)  trip at low enough DC currents such that an upstream type AC won't be blinded by DC currents low enough to be passed?

    For a practical example: in a TT system, if an EV charger circuit is protected by a type B, can an upstream time delayed RCD (which guards the whole house, along with RCBOs on each circuit) be type AC, or does it need to be type A or type B, or what?

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