i have a new garage with a 60 amp breaker running from the house to the garage. a new service panel with 240 volts line 1 red line 2 black . 240 vac across terminals. 120 vac from red to ground. 120 volts from black to ground. i am trying to install 6 light fixtures in ceiling. but i cant even get 2 of then to light up completely. when i turn on the lights my amp reading is only 4 amps on a 15 amp circuit . which is good. but my voltage drops down to 47 vac on that breaker to ground. and goes to 193 vac . on line 1 red to ground. so now i just discovered this weird voltage problem. my garage door has been working ok. but that breaking is dropping from 120 vac to 75 vac. how can i fix this problem ?
Electrical – ac voltage drop
electrical
Related Solutions
In this case, you would simply not hook up the neutral wire. Instead you can just put a wirenut on it and tuck it neatly into the electrical box.
Typically 240V appliances require the neutral wire so that they can run the electronics at 120v or provide a plug on the appliance. In this case, these devices are hooked up to one leg of the hot and the neutral, giving 120V.
If no neutral is required, then the device can only operate on 240V/208V, though at 208V you should expect the oven to take longer to heat up.
What it means by "Connect only to a 3-wire, 120/240-volt power supply; the neutral conductor is not required for the operation of the appliance," is that the 240V needs to come from two legs of 120V service; this device won't function on 240V mains like you'd find in Europe.
The multimeter may be off trying to accurately measure an AC voltage that ends up looking like chopped AC cycles.
There is a good possibility though that no load on a triac switch of the dimmer could look like an AC waveform of full voltage to the relatively high impedance of the multimeter input if the dimmer design has a resistor/capacitor snubber circuit across the triac. The diagram below shows the typical snubber configuration used (R2 and C2). R2 is commonly a resistor of a couple hundred ohms in series with the capacitor. When the triac is OFF the snubber circuit will be able to pass the AC waveform through when a meter with an typical input impedance of 20K to 50K ohms is used across the open lamp terminals.
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Best Answer
There's either a problem with the grounded (neutral) feeding the panel, or the one feeding the house. If you're only seeing the problem in the garage panel, and not the house. Then the problem is likely with the grounded (neutral) feeding the garage panel. Make sure the connections are tight, undamaged, and are not corroded. Also verify that the wire is not damaged, and is properly sized.
Depending on your level of experience, it might be time to contact a local licensed Electrician.