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ByDave Rongey © Ask the Electrician 2017 Author, Licensed Electrical Contractor
» Home Electrical Wiring Guide Book

Is Low Voltage and 120 Volt Wiring Allowed In The Same Electrical Box?

There are two provisions that will allow this. Don’t get confused by the voltage specification of home electrical wiring in this scenario…

Electrical Question from Patrice about Electrical Safety
Background: Patrice, a Homeowner from Vonore, TN
Question: Can I run outside low voltage wire (12 volt) through a 120 volt electrical box?

Additional Comments: Wow. It is awesome to have this website for reference!

Dave’s Reply:
Thanks for your electrical question Patrice. There are two provisions that will allow this. If the wire is rated for 600 volts or if the box has a partition.  A similar situation is where a telephone wire is to be installed in a multi-gang box and set side by side with electrical wiring used for a light switch or an outlet. In this case an electrical box should be used which allows a partition to be installed between the two different types of wiring.
Don’t get confused by the 600 volt specification of home electrical wiring in this scenario. This just happens to be the standard rating for this category of wire which is manufactured for use in the United States and Canada.
So how will you know if the wire is rated for 600 volts you may ask? Well the rating is stamped on the wiring ether using ink lettering or the printing is molded into the insulation.

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