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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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    I think you mis-state the case somewhat. 

    A 30mA RCD is certain to still trip with an earth fault of 30mA or less, even if there is up to 6mA of perfectly smoothed DC superimposed.

    A type A will still fire on a full amplitude rectified waveform that is not smoothed. 

    As opposed to batteries, where the old sweats drew a distinction between continuous (ripple free) and non-continuous DC (like rectified AC.

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    I think you mis-state the case somewhat. 

    A 30mA RCD is certain to still trip with an earth fault of 30mA or less, even if there is up to 6mA of perfectly smoothed DC superimposed.

    A type A will still fire on a full amplitude rectified waveform that is not smoothed. 

    As opposed to batteries, where the old sweats drew a distinction between continuous (ripple free) and non-continuous DC (like rectified AC.

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