Unless there is already current flowing in the circuit none of the methods should trip the RCD as there would be no current flow between neutral and earth, although if there is power being used elsewhere and the neutral and earth are not at the same potential at the mains supply then some of the...
This can happen when heavy loads are used within the installation and the live & neutral cables are not very large for the load it is carrying. When this happens the live feed and the neutral act as part of the load circuit and become a resistor hence there can be a few volts dropped in the...
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lynda, moderator
its very nice of you to reply, but as the post is 2 1/2 years old I do not think the OP will be worrying about it now