I'm having a problem wiring a plug and a pull switch to a fluorescent fixture. The switch wiring is the problem. If I connect the hot lead to the ballast and plug and the common to the ballast and plug I blow the breaker. If I do not connect the common on the switch the switch will not work. My ohm meter shows the switch is good.

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    Draw us a diagram of take a photo of what you've done. Your description isn't clear (although I have my suspicions). – brhans Jan 5 at 2:01

Because switches don't take neutral (which you call common). Only hot wires go to switches. That thing you think is "the other one from hot", is not neutral. It's switched hot.

First, connect all the grounds/earths.

Second, connect the neutrals to each other.

Third, take the switch out of its retail packaging /shipping box. .

Fourth, you should have two hots left over, one from the cord, one to the ballast. Those two go on the switch.

If you want to get some colored tape and color-code (which normal wires are not), then put red tape on the black (non-neutral) wire from the ballast, and tape the two wires on the switch so one is black and the other is red.

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