Electrical Room Requirements per AS/NZS 3000:2018
AS3000 Electrical Rooms. Proper design and layout of electrical rooms and switchboard spaces are essential for safety, access, and ongoing maintenance. Clause 2.10.2.2 of AS/NZS 3000:2018 outlines the minimum clearance and access requirements, particularly for switchboards, to ensure personnel safety and compliance with statutory obligations.
Clearance Requirements – Clause 2.10.2.2
Switchboard access must allow for safe operation, inspection, testing, and maintenance. The following clearances apply:
- Minimum 600mm in front of switchboards when any part of the switchboard door is open. (Refer to Figure 1,2 & 3 below)
- Minimum 1.0m clear space in front of the switchboard when all doors are closed.
These clearances are measured horizontally from the front surface of the switchboard to the nearest obstruction, wall, or equipment. The increased clearance when doors are closed facilitates safe egress and access during normal operation, while the reduced clearance when doors are open accommodates maintenance with due consideration for obstruction.
Emergency Exit Provisions
For switchboards:
- Rated above 800A, or
- More than 3.0m in length
The following additional provisions apply:
- A minimum of two emergency exit paths must be provided, spaced as far apart as practicable.
- This requirement is waived only if a clear space of at least 3.0m is maintained in front of the switchboard, even with doors open. (refer to Figure 4 below)
The intention is to ensure unobstructed egress in the event of fire, arc flash, or other hazards, particularly in large or high-capacity switchrooms.
Fire Safety Considerations
While AS/NZS 3000 does not prescribe fire resistance ratings directly for switchrooms, the standard references broader obligations under building and fire safety codes. Best practices include:
- Fire-rated walls separating the electrical room from adjacent spaces
- Fire extinguishers or suppression systems rated for electrical fires
- Clear signage indicating high-voltage equipment
- Use of non-combustible materials and cable containment systems
Further guidance should be taken from the National Construction Code (NCC) and local fire authority recommendations.
Lighting Requirements
Electrical rooms must be adequately lit to ensure:
- Safe access and egress
- Visibility during inspection, testing, and fault diagnosis
- Minimum illuminance of 160 lux at switchboard working surfaces is recommended
- Emergency lighting should be installed where switchboard rooms form part of an emergency egress path or are expected to be accessed during power outages
Lighting fixtures must be placed to avoid casting shadows on switchboards or working areas.
Ventilation and Cooling
Switchrooms must provide sufficient ventilation to:
- Prevent overheating of switchgear
- Control humidity to reduce condensation and corrosion risk
- Maintain ambient temperatures within the operational range of installed equipment
Design options include:
- Natural ventilation via louvres or ducts
- Mechanical extraction systems
- Dedicated air-conditioning or heat extraction fans for large or enclosed rooms
Consideration must also be given to heat load generated by transformers, inverters, or other high-output equipment housed in the same room.
Containerised Switchrooms
Metroid supplies fully fitted custom 40′ and 20′ containerised switchrooms built to comply with all relevant Australian standards and any stringent client specifications.
Having a complete containerised switchroom delivered with the control switchboards and all other equipment pre-installed, saves significant time and headache on site.
