Service
Hot tub and spa wiring
The 240 volt circuit, GFCI protection and disconnect a spa actually requires, installed to code.
Hot tub wiring is the strictest residential work in the code book, because it is the one place 240 volts and standing water share a backyard. Every rule around it exists because of that combination, and none of them are optional.
What hot tub wiring actually requires
A dedicated circuit. Typically 40 to 60 amps at 240 volts, sized to the nameplate of the specific tub rather than guessed from the model range.
GFCI protection for the whole circuit. Not a GFCI receptacle somewhere in it. The whole circuit.
A disconnect within sight of the tub. So that anybody working on it can see it cannot be energised behind them.
Bonding. The metal parts associated with the tub have to be bonded together.
A run buried at proper depth where it crosses the yard.
The little plug-and-play tubs are the only exception, and even they deserve their own circuit.
The two questions to answer before buying
Can the service carry it? A spa is among the largest loads a house can add. The load calculation against your existing service takes minutes and decides whether the install is straightforward or whether a panel upgrade comes first. The alternative to asking is a tub that trips every time the dryer runs.
Where will the run go? The trench across the yard is often the biggest line on the quote. Tell us where the tub is going before the quote, and if any other outdoor project is plausible, a shed, a charger by the driveway, lighting, the same trench can carry conduit for all of it once.
Existing tubs and inherited wiring
A meaningful share of hot tub wiring calls are not new installs but inherited ones: a tub that came with the house, wired by persons unknown to a standard unknown. Those get a full check before anything else, the circuit, the GFCI, the bonding, the disconnect, and whatever is wrong gets corrected on the same visit as any other electrical repairs the tub needs.
Deck and gazebo installs
Tubs on decks and under gazebos add their own rules about where the disconnect and the receptacles may sit relative to the water. It is routine when it is planned and awkward when it is discovered after the deck is built, which is why it comes up in most of our renovation conversations.
What the code actually requires
Most of the cost of a spa circuit is in the requirements rather than in the wire, and the requirements are the part that gets skipped.
GFCI protection is what people try to economise on, and it is the one part of the installation that exists to save a life rather than to protect equipment.
Bonding is the requirement most often missed, usually by whoever poured the pad, because it has to be done while the pad is being poured rather than afterwards.
The disconnect has placement rules, and they are not negotiable when the inspector arrives.
What the tub supplier usually does not include
Delivery, placement and the tub itself. Almost never the circuit, the disconnect, the GFCI or the permit. It is worth asking the supplier in writing what is included before the tub arrives, because the gap between “installed” and “connected” is where the extra cost turns up.
Sequence matters
Get the electrical planned before the pad is poured and before the tub is sitting in the driveway. Conduit under a pad is easy. Conduit beside a pad that already exists is a different job, and a tub already in position limits where the disconnect can go.
The permit and the inspection
New circuit, permitted work. In Nova Scotia only a certified electrician can pull that permit, and the inspection happens before you fill the tub rather than after. The process is on the electrical permits and inspections page.
What will this cost?
Nobody can price this down the phone, and anyone who does is guessing. What you can find out now is what will decide the number on your house.
Common questions
Can I plug a hot tub into an existing outdoor outlet?
Only the small plug-and-play tubs, and even those want their own circuit. A full-size spa draws 40 to 60 amps at 240 volts and requires a dedicated GFCI-protected circuit with a disconnect you can see from the tub. That is a code requirement, not an upsell.
Why does the disconnect have to be within sight?
So that anyone servicing the tub can kill the power themselves and see that nobody can restore it behind their back. Water plus 240 volts is the one combination in residential work with no margin, which is why the rules around spas are the strictest in the book.
What does the load calculation have to do with a hot tub?
A spa is one of the largest single loads a house can add. On a 200 amp service it usually fits; on 100 amps, alongside a heat pump and an electric water heater, it often does not, and finding that out before the tub is in the driveway is the whole point of asking.