Ocean to Outback · WA EC16326
Sub Mains in Perth Hills
A sub main is the cable that runs from your main switchboard to a second switchboard: in a shed, workshop, granny flat or pump house. On larger hills properties these runs can be long, and the cable has to suit both the distance and the load. OTOLEC is a licensed sub mains electrician based in Chidlow, working across the Perth Hills and rural WA.
Licensed electrical contractor
WA EC16326
Locally based
Chidlow, Perth Hills
Metro & rural WA
Homes, business, farms
Emergency callouts
Free quotes
No obligation
When you need one
- Powering a new or existing shed or workshop
- A granny flat or other building that needs its own switchboard
- Getting power to a pump, bore or water tank
- Upgrading an undersized sub main that's tripping or can't take new equipment
Underground or overhead?
WA's electrical requirements recommend underground consumer sub mains on rural properties with an overhead supply, and new private power lines should generally be underground. Rocky ground or very long runs can make that impractical, and an overhead run then has to use permitted poles and insulated cable. Before any digging, check for underground services at byda.com.au.
Sized for the run and the load
The cable is sized so the voltage drop over the distance stays within the Australian Standards, and so the total load stays within your connection. A standard Western Power connection allows up to 63 A single-phase or 32 A per phase three-phase. If new buildings or equipment raise the property's maximum demand, the network operator must be told.
What's included
- Assessment of the main switchboard, the route and the load at the far end
- Cable sizing for the distance and equipment
- A sub-board at the new building, with the required protection
- Lodging the required notices (adding or upgrading a sub main is notifiable work in WA) and an Electrical Safety Certificate
- Testing at both ends
Ready to talk through your job?
How it works
01
Call or request a quote
Start with a call or your contact details. We discuss the service, your location and the work involved. Quotes are free and without obligation; urgent electrical concerns should always be raised by phone.
02
Arrange a visit
Confirm availability, access and what needs assessment. Mention equipment, planned changes and any constraints that affect attendance. We'll arrange a time that suits you.
03
Agree the work
The existing installation and proposed scope are assessed before the work proceeds. Discuss any changes to the requirements so the job reflects your property and the electrical work that is actually needed.
04
Tidy up and test
Completion includes attention to the work area and testing of the electrical work performed. Ask any questions about the installed fittings, controls or repair before considering the job complete.
Based in Chidlow
Find your local service
Based in Chidlow, OTOLEC services homes, businesses and rural properties across the Perth Hills, Perth metro and rural Western Australia. Choose your suburb below to read about the service locally, or call about a location not listed. Coverage and attendance are discussed for your actual job.
Your questions answered
Do I need a licensed electrician for a sub main to my shed?
Yes. All electrical work in WA must be done by a licensed electrical worker, and adding or upgrading a sub main is notifiable work. OTOLEC holds WA Electrical Contractor Licence EC16326.
Can my neighbour and I share a bore pump?
WA rules allow a shared pump to be supplied from either property, but only one supply may serve it at a time, a changeover-switch arrangement isn't acceptable, and a lockable isolating switch must sit next to the pump. A sub mains electrician can set this up correctly.
Will my shed need a new switchboard?
A sub main normally ends at a sub-board in the shed or building. We'll check what's there and what your equipment needs.
Do you travel to Perth Hills for sub mains?
Yes. OTOLEC services the Perth Hills, Perth metro and rural WA from Chidlow.
Official guidance
Related services
Need a hand with your electrical?
Let’s talk about your job.
Call 0435 591 549Emergency and after-hours callouts: call to confirm availability.
- Licensed WA EC16326
- Fast, local response
- Obligation-free quotes