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Alex
Alex, Master Electrician
Category: Electrical
Satisfied Customers: 1753
Experience:  Owner of independent electrical contracting company. Licensed Electrical Contractor in CT.
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I am installing a emergency exit sign that needs to be hard

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I am installing a emergency exit sign that needs to be hard wired. What size romex wire should I use and does it need to be on it own breaker switch?
Hello and Thank you for posting on www.justanswer.com. My name is XXXXX XXXXX I'm here to help you.

I usually try to put exit sign on the lighting circuit , that way if breaker trips and lights go out the exit/ emergency lights will come on.
Use 12/2 wire to be safe.
If its commercial building you should use MC and not romex. Check what type of wiring is done .

Let me know .
Alex and other Electrical Specialists are ready to help you
Customer: replied 3 years ago.

It is a commercial building. Not familiar with the term MC. What does it stand for? Also there are 5 other emergency exit signs that exist. I am adding one into it. Should I run the new exit sign wiring directly to the lighting circuit at the panel?

It's best to run wire from existing exit signs. What type of wires are ran now?
Customer: replied 3 years ago.

Are you saying to run all the exit signs in a loop and not individually back to the circuit breaker?

Each exit sign does not have to be dedicated circuit from panel. They are jumped ( looped ) between each other. So if you already have existing exit sign then just tap to the nearest one.

Let me know if you have more questions.
Customer: replied 3 years ago.

Great! What does the term MC stand for that you referred to?

Type of wire which is used in suspended ceiling applications.
This is the one.

http://www.goodmart.com/products/southwire-armorlite-aluminum-clad-type-mc-12-2-cable-12-2-mc.htm
Please let me know if there was something I did not answer. I see you left ok rating. My goal is your 100 percent satisfactory .

Let me know