How to Wire a Mini Split System
What type of wire should I use to install a mini split system?
Wiring a Mini Split System
Electrical Question: What type of wire should I use to install a mini split system?
Jerry in Ohio asks:
- I am in the process of installing a 18,000btu mini split system for my garage. The mini split system manufacturer recommends a 20 amp breaker in the main panel with 12/2 wiring going to an outside disconnect near the unit.
- My question is:
Which type of wire should I be using, since part of the wire will be running through conduit outside and into the disconnect?
- Also, if I have a 20 amp breaker in the main panel and run 12/2 to the disconnect, could I also install a 20 amp breaker in the disconnect?
- I have installed hot tub circuits in the past with a 50 amp breaker in the main panel running 6awg wire to a 30 amp breaker in an outdoor box, but have not run HVAC before, so I am looking for some advice/recommendations on wire size, setup, etc. Please let me know if you need any additional information.
Thank you very much and have a great day.
Additional Comments: This is a great website, full of very useful information. Thank you.
Thanks for your electrical wiring question Jerry.
Install Circuit Wiring for a Mini Split System
Application: Install New Circuit Wiring for a Mini Split System.
Skill Level: Intermediate to Advanced – Best performed by a Certified Electrician, Licensed Electrical Contractor, or Licensed HVAC Contractor.
Electrical Tools Required: Basic Electricians Pouch Hand Tools, Voltage Tester, and appropriate Safety Gear.
Estimated Time: Depends on the personal level experience, ability to work with tools, install electrical circuit wiring, and the available access to the project area.
Electrical Safety: Identify the electrical power source to the Mini Split System, turn it OFF and Tag with a Note before working with the electrical wiring.
Electrical Wiring Parts and Materials: Electrical parts and materials for the Mini Split System should be approved for the specific project and compliant with local and national electrical codes.
Electrical Codes and Inspections: Installing or changing home electrical wiring should be done according to local and national electrical codes as adopted in Ohio. A permit and inspections may also be required.
Install a Dedicated Circuit for a Mini Split System
This electrical wiring project is about installing new circuit wiring for a Mini Split System in the garage of a home.
Installing a New Circuit and Wiring for a Mini Split System
- Jerry, from the information you have provided, the main concern is that the manufacturer of this Mini Split Cooling System is specifying a dedicated 20 amp circuit for this specific unit. Therefore a 20 amp circuit is wired with #12 copper wire of whatever type that is installed for this application.
- So this means that either 12/2 Type-NM cable could be installed in approved areas of the protected structure of the garage, or #12 THHN or THWN wire may be installed in approved electrical conduit, such as PVC, EMT, or Flexible Conduit.
- As for the required disconnect at the unit, the electrical disconnect can be accomplished with a type of disconnect, such as a fused disconnect, or a disconnect with a circuit breaker, all of which offers the same 20 AMP circuit overload protection as specified for the Mini-Split System.
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