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Do all residual current devices (RCDs) use the same operating principle?

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Do all residual current devices (RCDs) use the same operating principle?

A.

Yes, they all detect current differences on live and neutral wire

B.

Yes, they all measure voltage on the earth conductor

C.

No, ELCB measures earth voltage, whereas RCD detects current differences

D.

No, depending on regulations some use thermal-magnetic operation

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