Introduction
Today we are going to talk about the requirements contained in the standard AS/NZS3000 around access to switchboards.
As previously discussed, a switchboard is an assembly of circuit protective devices, with or without switchgear, instruments or connecting devices, suitably arranged and mounted for distribution to, and protection of, one or more submains or final subcircuits, or a combination of both.
Switchboard safety isn't just about wiring. AS/NZS3000 emphasizes proper access, space, and exit strategies. Let's make sure our electrical systems meet these important standards!
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A high level summary of what we are about to discuss goes like this;
A switchboard should be located so that the switchboard and access to it are not blocked by the structure or contents of the building, or by fittings and fixtures within the building.
It should also be provided with adequate space around it on all sides where people pass, enabling all electrical equipment to be safely and effectively operated and adjusted.
Additionally, it should be equipped with sufficient exit facilities to allow a person to leave the area around the switchboard during emergency conditions.
Now lets get more specific.
Access Around Switchboards
The Australian standard AS/NZS3000 requires that there be enough access and exit points around the switchboard.
This is achieved by keeping a minimum distance of one metre from all sides of a closed switchboard that needs to be reached.
For domestic electrical setups, this distance can be reduced to 0.6 meters from the front of the switchboard.
Additionally, there must be unobstructed space of at least 0.6 meters around switchboards with switchgear doors in any position and with switchgear in a fully extended position, as shown below
Conditions For Large Switchboards
If the switchboard is rated at more than 800A or longer than 3m, there should be a minimum of two exit points, placed at a good distance from each other. It’s better if they are on opposite ends of the switch room.
If there’s more than 3m of space in front of the switchboard during normal operations, then a single emergency exit is sufficient.
To make it easy to bring the switchboard or equipment into the switch room, the doorways should be at least 0.9m wide and 2.2m high. Larger openings are obviously preferred.
Switchboards Opposite Each Other
When switchboards are positioned opposite each other, the clearance shall be measured with all doors in the open position.
To ensure easy exit during emergencies, doors of switchrooms or other rooms dedicated to switchboards should open outward.
They should be easy to push open without needing a key or special tool.
Multiple Switchroom Doors
If multiple switchroom doors provide access to the same switchboard, these doors should be spaced well apart.
Doors of enclosures dedicated to switchboards that open into a passage or narrow access way must be capable of being secured in the open position.
This is to prevent workers from accidentally being pushed towards the switchboard.
Rounding Up
All these conditions and requirements for switchboards aim to create a safe and accessible environment for both routine operations and emergency situations and reducing the risk of accidents.
That’s all we have for you today on this topic. If you’ve learnt something new from this post, you might also be interested in other articles we offer on related subjects available on our blog’s homepage. While you’re here, take a moment to explore our collection of electrical engineering calculators. Cheers!