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Jason, Service Technician
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Experience:  Over 20 years of experience in all types of installations, troubleshooting, and repairs.
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What is the meaning of common wire or terminal.

Resolved Question:

What is the meaning of "common" wire or terminal.
Submitted: 7 years ago.
Category: Electrical
Expert:  Jason replied 7 years ago.
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HiCustomer The term "common" can have 2 different meanings when it comes to electrical wiring. It can refer to either a neutral wire, or a wire that is connected to more than one other wire. For example, on a relay, you would connect a "common" (hot, not neutral) wire to a terminal. Then, depending on whether power is applied to the coil or not, the power on the common wire goes through the relay to the load, or doesn't if it is connected to a set of Normally Closed contacts.

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