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    Re: Test your magnetic compass.
    From: Ken Muldrew
    Date: 2012 Nov 17, 10:39 -0700

    On 2012-11-17, at 9:59 AM, Lu Abel wrote:

    Electrical conduit (pipe holding wires) and the spiral sheathing found on flexible BX cable are both make of steel -- it's way cheaper than aluminum.

    In North America, BX and teck sheaths are aluminum. For industrial work, almost all the rigid conduit used is aluminum (steel is used as well, but less extensively). EMT (electrical metallic tubing) can be aluminum or coated steel. Most residential wiring is Romex/Loomex: 2 or 3 nylon-sheathed copper conductors and 1 bare copper conductor inside a PVC jacket. Fixtures are usually terminated in steel boxes.

    In my house, the steel boxes affect a compass but the wiring (both with and without current flowing) does not.

    Ken Muldrew.
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