Registered electricians should assess the building's existing electrical installation and the existing electrical load to determine whether the existing electrical installation has sufficient spare capacity to support the requirements of the heat pump system, including any supplementary heating. In cases where additional capacity is required, separate dedicated circuits (i.e. wired back to the main switchboard) should be used. New electrical wiring should be installed following all codes and standards, including CSA Standard C22.1 and manufacturers' recommendations. All electrical work must be carried out by a registered electrician. An Electrical Certificate of Compliance (CoC) must be issued on completion.

Registered electricians should ensure that:

• Each piece of equipment is supplied with correct voltage.
• Overcurrent protection is properly sized to protect the load and the circuit (i.e. circuit breaker or fuse) and the mains wiring is sized correctly (i.e. minimum circuit ampacity).
• There is phase balance on three phase circuits (where applicable).
• The electrical service entrance can supply all of the power requirements of the system.
• A lockable isolating switch for outdoor unit is installed and attached to the house (not the outdoor unit).
• Waterproof protection to the electric connection is installed as required.

Do Not:

• Connect the isolating switch to the outdoor unit (i.e. unit cannot be isolated from power).
• Allow contact between wiring and refrigerant pipework.
• Run the main power cable and heat pump system power cable together.