High voltage power and low voltage power


New User
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on a mini split it has 120 volts running through the home and it states any voltage over 30 volts must have an electrical license to install. Now HVAC technicians are running these lines every day is this ok?

tom baker

First Chief Moderator
Staff member
From your occupation you are not related to the electrical industry. Your comment it states any voltage over 30 volts must have an electrical license to install, what document are you referring to as "it"?
When an HVAC technician can run these lines is up to the licensing rules in each area, this is not covered by the code.
FYI, the 120 volts is not considered high voltage.

Flicker Index

Senior Member
Pac NW
Ehhh. In HVAC, they refer to line side as HV, and isolated side of controls side as LV. So even though 120v is low voltage, they don't really call 120v lamps "low voltage lamps".


Senior Member
Three ways and it varies by state.

Most states exempt work done by people associated with a manufacturer.

A lot of states have “baby” electrical licenses. So for instance a CATV or telecom tech can get a restricted electrical license. It usually requires a test with questions like “What color is the green ground screw?”

A lot of states include electrical questions in the HVAC contractor license so they are licensed to do some limited electrical work.

Regardless an HVAC tech does a lot of electrical work in troubleshooting. It would be crazy to think that they have no business doing electrical work. That would imply they can work on the thermostat but can’t touch the fans or compressors. That’s crazy.

But most HVAC companies either have a separate electrical division and do electrical work as an electrical contractor or they have a close relationship with one. It’s one thing to replace a little flex and fittings. It’s quite another to add a breaker to a panel and pull a whole new run. That’s where typically they hand off to an electrician.