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Basic Wiring Question

Discussion in 'Electronic Basics' started by [email protected], Jan 11, 2006.

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  1. Guest

    I'm trying my first DIY electronics project. Here it is:
    I don't understand how to ground this circuit. What do I connect to
    the black termincal from the wall? What do I connect to the green
    terminal? What does the dashed line mean?
  2. (assuming you live in the US and you are connecting this to 120 volts)
    The black wire in a power cord (or the narrow flat slot in the
    receptacle) is the wire that has voltage with respect to ground,
    called "hot". It would connect to the 120 volt orange transformer wire.

    The white wire in a power cord (or the wide flat slot in the
    receptacle) carries load current, but is grounded back at the power
    panel, so it has very little voltage with respect to ground (only the
    wire drop caused by current passing through the wire). It connects to
    the white wire on the transformer.

    The green wire in a power cord (or the round hole in the receptacle)
    is safety ground, which does not carry load current, and is grounded
    back at the power panel. No connections are shown for it, in this
    schematic, but if you bolt the transformer core down, it would be
    connected to one of those bolts.

    Be sure to well tape all wires not used, as well as the connections
    you make. There will be lots more voltage on some of the unused wires
    than there are on the ones you connect. The black/white (probably
    black wire with white stripe) may have the highest voltage.

    This advice is worth what you paid for it.

    This first DIY project is a potential killer. Be very careful to
    touch no part of this thing when it is powered. If you kill yourself,
    please don't sue me.
  3. Jasen Betts

    Jasen Betts Guest

    from their website:

    Core and coil ballasts are insulated with a varnish-like material. This
    material must be penetrated at the point where the ground connection is made
    to ensure a good connection. This connection can be made when mounting the
    ballast to the luminaire, by using a star washer in combination with one of
    the mounting bolts.

    that's how you connect the green wire.

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