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Question – Does a 240 Volt Light Fixture Require a 2-Pole Circuit Breaker?

See why installing a 240 volt circuit without a 2-pole circuit breaker poses a hazard.


I have a lighting system which requires a 240v service and it pulls 5.5 amps. I ran 12-2 w/ground with the black and white both acting as the hot wires which the device specs said was o.k. My question is, with not much room in my box for breakers, do I have to have a 2-pole breaker (if so what amperage 15-20-30?) or can I just connect both hots to a larger single-pole breaker i.e. 30amp. If I do need a 2-pole breaker, how many lighting systems can I run off of it as not to overload my 12-2 wire but ultimately save space in the box?

You will need to connect the #12’s to either a 2-pole 20 amp breaker or two 1-pole 20 amp breakers that are side by side and have a Tie-Bar connecting them. If the panel is tight on space, you may be able to use Twin Breakers for a few of the 120 volt circuits to free up some space, this would depend on the panel make and model. If you do this, make sure these 120 volt circuits are not a part of a 3-Wire Set, that is sharing the same Neutral Wire, but rather are from a 2-Wire set, such as 12/2 Romex.
Because the circuit is 240 volts we must make sure that both lines go off at the same time. This prevents the possibility of only one 120v  line being energized. This would not only be a hazard for someone who may need to work on the fixtures, but may be a problem for the fixture also.
As for the quantity of fixtures, the #12 wire will limit you to no more than 3 fixtures rated at 5.5 amps each.
Make sure you color the white wire of the 12/2 Romex with either Black or Red tape, in the breaker box and at each fixture, and be sure to bond your ground wire at the breaker box and each fixture.


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  electrical wiring  

Complete Guide to Home Electrical Wiring

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Includes:
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring Light Switches
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
....and much more.





Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

Electrical Tips to Help You Wire it Right

The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

The Quickest Way to Check for Faulty Electrical Wiring!

The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.

Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!

The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..

The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.

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