Electrical Wiring for a House Trailer

By - Summary:

How to Install Wiring for a House Trailer: Romex Type NM Cable, Installing and Supporting Electrical Wiring, Electrical wiring for two modular sections that is spliced under the home into metal junction boxes.

Electrical Codes for House Trailer Wiring

Electrical Question: I would like to add two 110 volt circuits to a house trailer.

  • There’s room in the 100 amp panel.
  • My question is can I run 12/2 indoor Romex underneath the trailer and be within code?

This electrical wiring question came from: Richard, a Electrician from Lees Summit, Missouri

Dave’s Reply:
Thanks for your electrical wiring question Richard.

How to Install Wiring for a Trailer House


  • Skill Level: Intermediate to Advanced.
  • Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
  • Estimated Time: Depends on personal level experience and ability to work with tools and access to the area of the trailer.
  • Precaution: Identify the circuit, turn it OFF and  Tag it with a Note before working with the wiring.
  • Notice: Installing additional electrical wiring for the house trailer should be done with a permit and be inspected.

Electrical Codes and House Trailer Wiring

  • Romex Type NM Cable
    I was involved in a relocation project where the military was relocating service personnel and their families to mobile home parks and I recall that the electrical wiring for two modular sections was spliced under the home into metal junction boxes.
  • The wiring was Romex Type NM Cable which was installed above the membrane fabric, and this was acceptable in the state code here in California.
  • Installing and Supporting Electrical Wiring
  • This is very similar to installing electrical wiring under a conventional home where the wiring is well supported and secured to the floor.
  • Be sure to consult your local building department for verifications and details.

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


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