A switchroom is a dedicated, protected space that houses electrical switchgear and the equipment used to distribute and control power on a site. This guide explains what switchrooms contain, how containerised and transportable switchrooms differ from a built-in-place room, and the practical points worth settling before you specify one.
What is a switchroom?
A switchroom (sometimes written as “switch room” or referred to as a switchgear room) is the enclosure that protects the equipment controlling and distributing electrical power. Depending on the site, that can include switchboards and distribution boards, motor control centres, protection and metering equipment, control and instrumentation panels, and the associated cabling and earthing.
The room exists to do three jobs at once: keep the equipment in stable conditions, keep water, dust and unauthorised people away from it, and give qualified technicians safe space to work on it. Those three requirements drive almost every design decision that follows.
Containerised switchrooms
A containerised switchroom is built inside a modified shipping container rather than constructed on site. The container provides a sealed, structurally rated steel shell that is designed from the outset to be lifted, transported and secured, which makes it a practical starting point for an electrical enclosure that may need to move.
Because the container is a known, repeatable footprint, the fit-out can be planned precisely: equipment layout, clearances, cable entries and services are all worked out against fixed internal dimensions instead of a space that is still being built.
Transportable and prefabricated switchrooms
The terms overlap in everyday use. A transportable switchroom is one designed to be relocated rather than permanently fixed. A prefabricated switchroom is assembled away from the site and delivered as a finished unit. A containerised switchroom is usually both.
Why offsite assembly is common
Building the room away from the site moves a significant amount of work out of the site programme. Fit-out can proceed in parallel with civil and structural work rather than after it, the work happens in controlled conditions rather than in weather and site traffic, and the unit arrives as a single item to be positioned and connected. For remote sites in particular, this can reduce the amount of skilled labour that has to be mobilised and accommodated.
The trade-off is that decisions have to be made earlier. Once the unit is fabricated, changes are more disruptive than they would be in a room still under construction, so the specification work described below matters more, not less.
How to specify a switchroom
The following points come up on most projects. They are a starting checklist for the conversation with your electrical engineer, not a substitute for design.
Equipment and space
Start from the equipment schedule rather than the room. The footprint of the switchgear, the clearances required in front of and behind it for safe operation and maintenance, and the space needed to withdraw or replace components will determine whether a 10ft, 20ft or 40ft unit is appropriate, and whether a high cube is needed for additional internal height.
Cable entry and management
Decide early whether cables enter through the floor, a gland plate or the roof, and how they will be supported and segregated inside. Retrofitting cable entries into a completed unit is avoidable rework.
Environment and ventilation
Electrical equipment generates heat, and a sealed steel box in direct sun is a demanding thermal environment. Whether natural ventilation is adequate or air conditioning is required depends on the heat load, ambient conditions and the equipment ratings. Dust ingress, insulation and condensation control are related decisions, and coastal or corrosive environments may call for additional protective treatment.
Access and safety
Door sizes and swing direction, escape provisions, internal and emergency lighting, earthing, and any fire detection or suppression requirements should all be confirmed against the standards applying to your project before fabrication begins.
Transport and installation
Confirm lifting arrangements and lift points, transport dimensions and route constraints, and what the unit will sit on once delivered. A switchroom that cannot be craned into its final position is a problem discovered expensively late.
Compliance
Electrical installations are governed by standards and by state and territory requirements. Design, inspection and certification are matters for suitably qualified electrical engineers and licensed contractors, and compliance responsibilities should be established in writing before work begins.
Common questions
Is a containerised switchroom permanent?
It can be either. The same unit can be installed as a long-term fixture or treated as relocatable equipment that moves between sites as a project progresses. Deciding which applies affects foundation, services and connection choices.
What size switchroom do I need?
This follows from the equipment and its required clearances, not from a standard answer. Bring the equipment schedule and single line diagram to the sizing conversation.
Can existing switchgear be installed into a container?
Often yes, provided the dimensions, weight, access route into the unit and clearance requirements are checked against the container’s internal space first.
Next steps
If you are considering a containerised or transportable switchroom, the useful first step is to confirm the equipment list and clearances with your electrical engineer, then match that to a container size and fit-out.
BWContainers supplies switch room containers and modified shipping container switch rooms. You can also browse the full container range or get in touch with your requirements and delivery location to discuss options.