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It's weird there is no identification of polarity on them wires, just grey.
I would imagine that these are double-insulated cables, similar to the type we use in Britain for service wiring.

If you cut back the outer gray sheath you'll probably find a separate layer of color-coded insulation, like this:
[Linked Image from tlc-direct.co.uk]


[This message has been edited by pauluk (edited 09-07-2004).]