There is no neutral wire to attach in this type of panel. Grounding is the same as for any other panel.
Things You Will Need
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Turn off all power to the breaker panel. This is usually a main breaker or a transformer.
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Open the panel cover(s) and remove the breaker front from the panel. There are usually several screws holding it onto the panel. Use a screwdriver to remove the screws.
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Check all the main terminals carefully, using a voltmeter, to ensure that the power is off. Measure the voltage between each of the hot wires and then check each terminal to ground.
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Locate the three hot wires entering the panel. Using a screwdriver, loosen the terminals on the breaker. Place one of the wires under each lug on the breaker and tighten until snug.
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Locate the ground entering the panel, place it under a ground bar lug, and tighten until snug.
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Install the panel cover(s) and screws. Carefully replace the cover(s) to avoid damage to any wires.
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Turn on the power source. Check the operation of the device.
The Drip Cap
- In commercial and industrial applications, the use of three-phase power is common.
- Three-phase power has three hot wires instead of one.
- Check all the main terminals carefully, using a voltmeter, to ensure that the power is off.
- Locate the ground entering the panel, place it under a ground bar lug, and tighten until snug.
- Install the panel cover(s) and screws.