Short answer: Pools and spas need equipotential bonding: conductive parts such as concrete reinforcing steel, and metal items within arm’s reach of the water, are bonded to the home’s earthing system so there’s no dangerous voltage between them. Pumps, heaters, chlorinators and lights also need suitable circuits, safety switch protection and weatherproof, correctly placed outlets. Get a licensed electrician involved before the concrete is poured.
Water and electricity are a dangerous mix, and a pool or spa brings them together every day. Most Inner West backyards are small, so pool equipment often ends up close to fences, paths and the house. Here’s what the electrical side involves and why timing matters.
Equipotential bonding explained
Pumps and other pool equipment run on mains power. If a fault develops, metal parts near the pool can become live. Equipotential bonding connects conductive parts together and to the earthing system so they stay at the same voltage. That reduces the risk of current flowing through a person who touches two parts at once, or touches a part while in the water.
According to WA’s electrical safety regulator, which explains the national wiring rules for homeowners:
- metal items within arm’s reach of a bather (1.25 metres from the pool edge) must be bonded to the main earthing system
- these include fencing, light fittings, handrails, ladders, diving board structures and gates
- the steel reinforcing in concrete pools and spas must also be bonded
- bonding must be done by a licensed electrical contractor, who should be consulted at the start of the work
The same wiring rules, AS/NZS 3000, apply in NSW.
Why timing matters
The reinforcing steel is buried in concrete. If the bonding connection isn’t made before the pour, it’s much harder to do afterwards. Book your electrician when you book the pool builder, and make sure they talk to each other about the program.
Typical pool and spa electrical items
| Item | Electrical notes |
|---|---|
| Filter pump | Needs a suitable outlet or circuit, protected by a safety switch, in a weather-protected spot |
| Chlorinator or salt cell | Usually plugs into a weatherproof outlet near the pump |
| Pool heater or heat pump | Often needs a dedicated circuit; check the manufacturer’s requirements |
| Spa blower and heater | Can draw significant current; may need a dedicated circuit |
| Pool lights | Low-voltage or specially rated fittings, installed to the manufacturer’s instructions |
| Garden and pool surrounds lighting | Weatherproof fittings; see our outdoor lighting guide |
| Automation controller | Power and sometimes data for app control |
Zones near water
The wiring rules set zones around pools and spas that limit what electrical equipment can go where and what protection it needs. This affects:
- where power points and switches can be placed
- the IP rating of fittings
- whether equipment must be low voltage
The distances depend on the layout, so leave the final positions to your electrician and pool builder.
Safety switches are essential
All pool and spa circuits should be protected by safety switches (RCDs). If your switchboard is old or has ceramic fuses, it may need an upgrade before pool equipment is connected. See safety switch rules in NSW and signs you need a switchboard upgrade.
If your pool equipment trips the safety switch, don’t keep resetting it. That’s a sign of a fault, often moisture in a fitting or a failing pump motor. See power tripping when it rains.
Getting power to the pool area
Pool equipment is often at the far end of the yard. Options include:
- a new circuit from the main switchboard, cabled underground to weatherproof outlets
- a small sub-board near the equipment, if there are several loads
- upgrading an existing outdoor circuit if it’s suitable
Underground cabling must be installed and protected to meet the wiring rules. See power to a shed, garage or studio for similar considerations.
Above-ground pools and portable spas
Plug-in spas and above-ground pools still need care:
- plug only into a suitable, weatherproof outlet protected by a safety switch
- don’t use extension leads for permanent equipment
- keep cords off the ground and away from water
Maintenance
- Have bonding and connections checked if fencing, decking or equipment is replaced
- Keep pump covers in place and equipment areas dry
- Test safety switches regularly, and get faults checked promptly
Building a pool or adding a spa? Book the electrical early, before the concrete pour. Call 0421 772 661 or see our residential electrical services.
We help homes in Haberfield, Canada Bay, Croydon and Summer Hill.
Frequently asked questions
What is pool equipotential bonding?
Connecting conductive parts of a pool, such as reinforcing steel and nearby metal fences and fittings, to the home’s earthing system so there’s no dangerous voltage difference between them.
When should the electrician be involved in a pool build?
At the start, before the concrete is poured, so the reinforcing steel can be bonded.
Does a pool pump need its own circuit?
It depends on the pump and other equipment. It must be on a suitable circuit protected by a safety switch. Heaters and spas often need dedicated circuits.
Can I plug a portable spa into an extension lead?
It’s not recommended for permanent use. Use a suitable weatherproof outlet protected by a safety switch.