The outside condenser is connected to the home’s electrical panel via a 120V (12K single-zone compressors only) or 220V circuit (18K 24K 27K & 36K compressors). It will need an HVAC disconnect – see here to be up to code.
The air handlers are connected to the condenser by a low voltage [extendable] communication cable and follow the same route as the line sets. The communication wire is extended by cutting it and adding the new line – it is re-joined using standard electrical crimps – see here. You can either use the existing armoured cable, remove the spade connectors and connect it to the off the reel cable, or use the off the reel cable entirely and take the spade connectors off the armoured cable. Off-the-reel cable is several hundred dollars less expensive to you as the customer, that’s why we use it. You can choose to purchase off the shelf protective conduit as required to run from the condenser to the lower opening of the line cover or building entry point. You don’t need conduit protection inside the line cover set or building.
You can either do the electrical work yourself and ask a qualified electrician to check/test and sign it off or ask them to do all the work.
Note: If you’re applying for a rebate you’ll need an electrical permit – home wiring with the district or anyone but a qualified electrician signing it off – is not valid.