Adding a sauna or pool to an older switchboard

Backyard pools have always been part of Illawarra life, and home saunas and cold plunges have become popular too, from Shell Cove to Berry. They are great additions. They also add some of the biggest electrical loads a house will carry, and older switchboards are not always ready for them.

Customers have told us about the pool and garden lights we powered and the saunas we installed. In each case, the first question was the same: can the switchboard handle it?

Why these loads are different

Saunas

A traditional sauna heater draws a substantial current for long periods while the room heats up and stays hot. Many must be hard wired on a dedicated circuit. Larger infrared cabins also usually need their own circuit.

Pools and spas

A pool pump runs for hours each day. Add a chlorinator, lights, a heat pump or spa heater, and the load builds. Pool circuits also need equipotential bonding and RCD protection, and must respect the zones around the water set out in AS/NZS 3000.

Signs your board may not be ready

• Ceramic rewireable fuses rather than circuit breakers
• No safety switches, or only one for the whole house
• No spare positions for new circuit breakers
• Existing circuits that already trip under load
• A meter box that is damaged, corroded or has an old backing panel

Read signs your switchboard needs an upgrade for more detail on each.

It is not just the board

The switchboard is only part of the picture. The main cables from the meter to the board and the supply to the property also have limits. If you are adding a sauna heater on top of induction cooking, air conditioning and a pool, the total demand needs to be checked. An electrician can assess the expected load and advise whether the existing supply is sufficient or whether changes are needed.

What the work usually involves

• Assessing the switchboard, main cables and expected load
• Upgrading the board if needed, adding circuit breakers and safety switches
• Running a dedicated circuit to the sauna or pool equipment
• Underground cabling in conduit at the correct depth
• Bonding for pools and spas at the right stage of construction
• Isolating switches and weather rated enclosures outdoors
• Testing and NSW compliance paperwork

Questions to ask the supplier

• What circuit rating does the heater or equipment need
• Must it be hard wired, or can it plug in
• Does the controller mount inside or outside the sauna
• Are there clearance or ventilation requirements around the equipment

Having these answers in writing makes the electrical quote faster and more accurate, and avoids buying something your home cannot run without extra work you did not plan for.

Timing

For a pool, involve the electrician early so cabling and bonding happen while the trench and formwork are open. For a sauna, check the electrical requirements before you order, as the installation manual will specify the circuit needed. Running the circuit before delivery means the sauna can be connected as soon as it is assembled.

Coastal blocks

On blocks close to the water at Gerringong, Kiama Downs or Barrack Point, outdoor enclosures and fittings take a beating from salt air. Choosing suitable materials and sheltered mounting spots extends their life. See surge protection for coastal homes.

Next step

Send Kalani the sauna or pool equipment specs, a photo of your switchboard and a photo of where it will go. Call or text 0424 400 346. More on our sauna installation, pool and outdoor power and switchboard services pages.