Choosing the Right Meter Box Size
How to pick between 300x300, 400x400, 500x500, 600x600 and 600x900 meter boxes for residential and commercial metering installations.
Match the box to the metering
The box size follows the metering layout, not the other way around. A single-phase single meter fits a 300x300; a standard residential service with main switch and service fuse usually calls for 600x600; multi-phase or multi-meter commercial installations step up to 600x900. Leave room for the panel, the service fuse enclosure and cable dressing — a cramped box costs more time than a bigger box costs money.
Think about what's coming
Solar, EV charging and granny flats all add metering and protection over a property's life. If there's any prospect of load growth, size up one increment now — retrofitting a larger box later means network coordination and wall repairs that dwarf the original saving.
Depth and mounting matter too
Standard 255mm-deep boxes suit surface mounting; flush installations use a 100mm panel-and-surround format instead. On poles, pair the box with a U-hook bracket and backing plate so the enclosure sits rigid and rattle-free.
Related Products
Electrical Meter Boxes
Galvanised meter boxes from 300x300 to 600x900
Meter Box Solutions
Sort the metering enclosure before you're on site
Custom Main Switchboards
Fabricated in Sydney to your exact specification
Meter Boxes for Duplexes
Two-meter enclosures for side-by-side dwellings
Meter Boxes
Galvanised steel meter boxes
Switchboards
Main switchboards & distribution boards
Meter Surrounds
Panels & surrounds for meter installations
Electrical Contractors
Boards, boxes and metering at trade volume
Property Developers
Multi-lot metering packages and staged supply
Keep Reading
The Complete Guide to Meter Boxes
Everything trade buyers need on meter boxes — sizing, materials, mounting, sealing, IP ratings and how to order the right enclosure the first time.
How to Choose the Right Meter Box
A quick decision guide to picking a meter box — matching the enclosure to the metering, the environment and the mounting method.
What Size Meter Box Do I Need?
A quick sizing guide mapping common meter box sizes to residential and commercial metering layouts.