Precision Cooling / Electrical Infrastructure
Switchroom and MCC RoomPrecision CRAC Cooling Australia
Direct answer
A precision CRAC unit is the right cooling for an electrical switchroom or MCC room, not standard ventilation and not a comfort split system. Most switchgear and MCC manufacturers specify a maximum continuous ambient of 40 degrees Celsius, and in Queensland, Western Australia and the Northern Territory outdoor temperatures regularly exceed that before equipment self-heating is added on top.
Indigi Power and Cooling supplies, installs and maintains precision CRAC cooling for switchrooms across Australia, from 3kW wall-mounted units to 50kW and above for large MCC rooms. Call 1800 046 344.
Why it matters
Heat does not tripthe breaker
A switchroom rarely fails because of one hot day. It fails because it has spent three years running eight degrees above where the switchgear was rated to sit, and everything inside it has been quietly ageing at an accelerated rate the whole time.
Sustained overtemperature does specific, cumulative damage. Insulation in switchgear and cable terminations degrades faster. Capacitor banks in variable speed drives and power factor correction equipment fail early, because capacitor life is more sensitive to ambient temperature than almost any other component in the room. Protection relays and electronic control modules lose service life. And thermal protection relays begin nuisance tripping at loads they used to handle without complaint, which gets misdiagnosed as a relay problem rather than a room problem.
The other failure mode is the opposite of heat. Temperature swings drive condensation onto busbar insulation, which corrodes terminations and tracks across surfaces. Ventilation cannot address that at all, because ventilation has no humidity control. It simply brings outside air, and its moisture, into the room.
There is also a commercial exposure that gets overlooked. Switchgear and drive warranties are written against a rated ambient. Operating outside it can void them, and the first time anybody checks is usually during a claim.
Indigi Power and Cooling is Indigenous and Veteran-owned, Supply Nation and ICN Gateway registered. Refrigerant work is carried out under ARCtick licence and electrical work by qualified electrical personnel, with compliance documentation provided on completion.
Two approaches
Ventilation and splitor precision cooling
Vents and
a split
- Designed for intermittent comfort duty, not 24/7 industrial
- Cannot hold setpoint when ambient approaches design temperature
- No humidity control, so condensation risk is unmanaged
- Single unit, no redundancy path during service
- Ventilation brings outside dust and moisture into the room
- Fails quietly, and usually in the worst week of summer
Precision
CRAC
- Continuous 24/7/365 duty, rated for it
- Holds setpoint regardless of outdoor ambient
- Active humidity control against busbar condensation
- N plus one, so a unit can be serviced without exposure
- Filtered, closed circulation suited to dusty environments
- BMS and SCADA integration over Modbus, BACnet or SNMP
Case study / Recent project
MCC room and switchroom cooling, large manufacturing facility
Indigi Power and Cooling completed the design, supply, installation and commissioning of a full precision CRAC cooling solution for the electrical switchroom and MCC room at a large Australian manufacturing facility. Vertiv Liebert DM22 upflow precision CRAC units with matching outdoor condensers, engineered to hold stable thermal conditions for the facility's switchgear, motor control centres and protection systems year round.
Project highlights
Vertiv Liebert DM22 upflow CRAC units with precision upflow air delivery into the switchroom. N plus one redundant configuration. Wall mounted DM22 outdoor condensers on the switchroom exterior. Heat load assessment, system design and full commissioning by Indigi engineers. Delivered on an active industrial site under strict access and safety requirements. Talk to us about a similar scope.
A distinction worth making
Cooling the room, or cooling the cabinet
Search for switchroom cooling and you will get two different products mixed together. Enclosure coolers bolt onto a single switchboard or cabinet. Room cooling conditions the whole space. They solve different problems, and buying the wrong one is common because the language overlaps.
| Approach | What it does | When it is the right answer |
|---|---|---|
| Enclosure or cabinet cooler | Mounted on or in a single switchboard. Air to air heat exchangers, heat sinks, vortex coolers or small cabinet air conditioners, rejecting heat from inside the cabinet into the room | One hot cabinet in a room that is otherwise within its rated ambient. Also useful where a single drive or panel runs much hotter than everything around it |
| Room level precision CRAC | Conditions the whole switchroom, holding temperature and humidity across every panel in it, with filtration and redundancy | The room itself sits above rated ambient, or there are multiple panels, or the room has no reliable building HVAC. This is most Australian industrial switchrooms |
| Ventilation only | Moves outside air through the room with fans and louvres, with no cooling and no dehumidification | Rarely adequate on its own in Australia. It cannot get the room below outdoor ambient, and it imports dust and moisture while trying |
| Room pressurisation | Holds the room at slight positive pressure with filtered air so dust, debris and moisture cannot infiltrate through cable entries and door gaps | Used alongside room cooling on dusty or corrosive industrial sites. Protects the switchgear from contamination rather than from heat |
The two are not mutually exclusive. A large MCC room may run room level CRAC cooling for the space and a dedicated enclosure cooler on one drive cabinet that produces disproportionate heat. What does not work is using cabinet coolers to try to fix a room that is fundamentally too hot, because every one of them rejects its heat into that same room.
Room types
Where switchroom cooling applies
| Room type | Typical equipment | Why CRAC cooling |
|---|---|---|
| MV and LV switchroom | Circuit breakers, busbars, protection relays | Prevents insulation degradation and keeps relay accuracy inside specification |
| MCC room | Motor control centres, contactors, overloads | High heat density in a small footprint, and nuisance thermal tripping to avoid |
| VSD and drive room | Variable speed drives, soft starters, inverters | Capacitor life depends on ambient temperature more than on anything else |
| Control and SCADA room | PLCs, HMIs, SCADA servers, comms equipment | Tight temperature and humidity control for electronics |
| Substation and relay room | Protection relays, SCADA RTUs, telecommunications | Remote locations with no reliable building HVAC to fall back on |
| UPS and battery room | UPS systems, VRLA or lithium ion batteries | Valve regulated lead acid battery life roughly halves for every 10 degrees Celsius above 25 |
| Transportable or modular switchroom | All of the above in a prefabricated enclosure | No existing building HVAC, and full outdoor or remote exposure |
Configuration
How it differs fromserver room cooling
A switchroom CRAC works on the same direct expansion principle as a server room unit, but the configuration decisions are different, and copying a data centre design into a switchroom produces a room that does not perform.
Upflow is usually right. The unit draws warm air in at the top, conditions it, and delivers cool air downward. In a switchroom with cable trenches, that cooled air can be distributed under the floor and up through cable entry points directly into the switchgear compartments, which is where the heat actually is.
Downflow suits raised floors, delivering into a floor plenum for distribution below switchgear, and is the less common of the two in industrial rooms.
Density is lower but sensitivity is higher. A server room runs higher heat density with tighter temperature tolerance. A switchroom typically has lower density but is more exposed to humidity and condensation, sits next to industrial heat sources, and is frequently in a remote location with no building HVAC to fall back on.
N plus one is standard practice, not a premium option, because a switchroom cannot be allowed to leave its temperature limits while a unit is serviced.
Units integrate with BMS and SCADA over Modbus, BACnet or SNMP, so alarms and temperature trending land in the control infrastructure the site already runs rather than in a separate system nobody watches.
Design
Cooling belongs in the room design
Heat load first
Total switchgear and MCC dissipation drives the cooling capacity, so a heat load assessment sets the design brief before any unit is selected. This is the step that gets skipped when cooling is added after the switchgear is already installed.
Air path
Upflow or downflow delivery chosen to suit cable trench or raised floor layouts, so cooled air actually reaches the switchgear compartments rather than short cycling back to the unit.
Redundancy built in
N plus one sized into the room from the start, so a unit can be serviced without the switchroom leaving its temperature limits. Retrofitting redundancy into a finished room is considerably more expensive than designing it in.
Contamination, not just heat
On dusty or corrosive sites, decide early whether the room needs positive pressurisation with filtered air. Dust and moisture entering through cable entries and door gaps damage switchgear independently of temperature, and pressurisation is far easier to design in than to retrofit around installed panels.
Space and access
Compact wall mounted CRAC options suit tight switchrooms with no floor space. Larger MCC rooms take floor standing units with outdoor condensers, which then need a clear discharge path and service access on the exterior.
Equipment
Units we specify for switchrooms
Not every CRAC unit suits a switchroom. We specify systems with upflow delivery, high sensible heat ratios and construction robust enough for industrial conditions.
| System | Configuration | Capacity |
|---|---|---|
| Vertiv Liebert DM22 | Upflow DX, wall or floor mounted condensers, high sensible heat ratio | 5 to 22kW |
| Vertiv Liebert DME | Upflow or downflow DX, compact footprint for space limited switchrooms | 5 to 30kW |
| Schneider Uniflair IDAV | Downflow DX, EC fans, VSD scroll compressors, high ambient rating | 20 to 50kW |
| Uniflair wall mount | Wall mounted precision split for compact switchrooms with no floor space | Small room range |
| Vertiv SRC-G wall mount | Wall mounted split, ambient rated to 48 degrees Celsius | 3 to 11kW |
View the full precision cooling range, or see how the same technology is applied in server rooms and comms rooms.
Commercial
Switchroom cooling cost guide
Indicative system supply and installation, excluding site specific electrical works, cable containment and ongoing maintenance. A heat load assessment is always required before final specification.
Vertiv SRC-G or an equivalent wall mounted precision split. Suits relay rooms, small control rooms and compact switchrooms with no floor space available.
Vertiv Liebert DM22 in N plus one configuration with matching outdoor condensers. The configuration used on the case study above and the most common switchroom install we do.
Schneider Uniflair or Vertiv DME, sized against measured switchgear dissipation, with condenser siting and access assessed on site.
Compliance
Australian Standards that apply
Precision cooling in an electrical switchroom sits across mechanical, electrical and refrigeration standards at once. All our installations are performed by ARCtick licensed refrigeration technicians and qualified electrical personnel, with compliance documentation provided on completion.
| Standard | Relevance |
|---|---|
| AS/NZS 3000 | Wiring Rules. Governs electrical integration of CRAC units into switchroom distribution, including dedicated circuits and isolation |
| AS/NZS 1668.2 | Mechanical ventilation and air conditioning, applicable to mechanical plant serving switchrooms |
| AS/NZS 5149 | Refrigerating systems and heat pumps. Compliance for the DX refrigerant systems used in CRAC units |
| AS 61439 | Low voltage switchgear and controlgear assemblies. Defines the ambient temperature limits that the cooling has to maintain, which is what makes this a compliance question rather than a comfort one |
Sectors
Industries we serve
Coverage
Switchroom coolingacross Australia
Brisbane and QLD
Brisbane CBD, Port of Brisbane, Ipswich, Gold Coast, North Queensland, regional QLD
Heat and humidity make switchroom cooling a requirement rather than an option. We recommend N plus one for all Queensland MCC and VSD rooms.
Sydney and NSW
Sydney CBD, Western Sydney, Hunter Valley, Newcastle, Wollongong, Canberra
Industrial facilities, data centre plant rooms and government infrastructure across NSW and the ACT.
Melbourne and VIC
Melbourne CBD, Port Melbourne, Dandenong, Geelong, Ballarat, regional Victoria
Manufacturing, food and beverage, and pharmaceutical facilities, including the case study project above.
Perth and WA
Perth CBD, Fremantle, Kalgoorlie, Pilbara, Kimberley, remote WA mine sites
Summer temperatures of 45 degrees and above make active precision cooling non-negotiable in the Pilbara and Kimberley.
Darwin, NT and SA
Darwin, Palmerston, Katherine, Alice Springs, Adelaide, Port Augusta, Whyalla, Olympic Dam
NT switchrooms face the harshest combination of ambient heat and humidity in the country. Technicians fly in from Brisbane.
Remote, offshore and the Pacific
Remote mine sites, offshore platforms, Papua New Guinea, Fiji, Solomon Islands, Vanuatu
We manage logistics, freight and site access for locations without an established service provider network.
Questions
Switchroomcooling FAQs
What electrical and facilities engineers ask before a switchroom cooling project. If yours is not here, call 1800 046 344.
Why does an electrical switchroom need precision cooling?
Switchrooms house switchgear, MCCs, VSDs, protection relays and control panels that generate continuous dry heat. Sustained temperatures above 40 degrees Celsius accelerate insulation degradation, increase nuisance tripping, and shorten the service life of capacitors and relay components. A precision CRAC unit holds a stable controlled environment regardless of outdoor temperature, which standard ventilation cannot guarantee in Australian conditions.
What temperature should an electrical switchroom be?
Most switchgear and MCC manufacturers specify a maximum continuous ambient of 40 degrees Celsius, with an optimal range of 15 to 35 degrees. Protection relays and electronic control systems often specify tighter tolerances of 20 to 30 degrees. Check the ratings for your specific switchgear, because the number in the manufacturer's documentation is what a warranty position is assessed against.
Can I use a standard split system to cool a switchroom?
A split system will reduce temperature but cannot deliver consistent 24/7 reliability, tight tolerances or humidity control. Splits are designed for intermittent use in occupied spaces, not continuous operation against a dry heat load. They also cannot prevent condensation forming on switchboard insulation during temperature swings, which is a failure mode precision CRAC units address directly and ventilation does not address at all.
What size CRAC unit does a switchroom need?
Capacity is sized on total switchgear heat dissipation, room volume, building construction and local climate. Small switchrooms may only need 3 to 7kW, while large MCC rooms in industrial facilities can require 20kW or more, particularly in Queensland, Western Australia and the Northern Territory. A heat load assessment is always required. Sizing from room floor area rather than measured dissipation is the most common way this goes wrong.
How much does switchroom cooling cost in Australia?
Indicatively, $8,000 to $15,000 for a small switchroom at 3 to 7kW using a wall mounted precision split, $25,000 to $45,000 for a medium switchroom or MCC room at 8 to 22kW with N plus one Vertiv Liebert DM22 units, and from $45,000 for large MCC rooms at 20kW and above. These figures exclude site electrical works, cable containment, commissioning and ongoing maintenance, and a heat load assessment is required before final specification.
What is the difference between switchroom cooling and server room cooling?
Server rooms run higher heat density with tighter temperature tolerance. Switchrooms typically have lower density but are more sensitive to humidity and condensation, often sit in industrial environments next to other heat sources, and are frequently in remote locations with no reliable building HVAC. The same precision CRAC technology serves both, but configuration differs: upflow rather than downflow is usually correct in a switchroom, and N plus one sizing is standard practice.
Why is upflow used in switchrooms?
Upflow draws warm air in at the top of the unit and delivers cooled air downward. In a switchroom with cable trenches, that cooled air can be distributed under the floor and up through cable entry points directly into the switchgear compartments, which is where the heat is actually generated. Downflow suits raised floor rooms delivering into a plenum, and is less common in industrial switchrooms.
Do you service switchroom cooling in remote and industrial locations?
Yes. We regularly supply, install and maintain precision CRAC cooling for switchrooms in mining, industrial and infrastructure environments across regional and remote Australia, including Queensland, Western Australia, the Northern Territory, and offshore and Pacific Island locations. We manage logistics, freight and site access for locations without an established service provider network.
What brands do you install in switchrooms?
Vertiv Liebert DM22 upflow precision CRAC units and DME compact units, Schneider Electric Uniflair DX for larger MCC rooms, and Vertiv SRC-G or Uniflair wall mounted splits where there is no floor space. All are purpose built for precision thermal management with high sensible heat ratios suited to the dry heat loads of switchgear environments.
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Tell us aboutthe room
Room size, switchgear type, location, and any temperature problems you already know about. We carry out a heat load assessment and recommend the configuration, with a fixed quote against what is actually there.
If your switchroom is already running warm, the useful first step is a measurement rather than a quote. We will assess the heat load, tell you where the room actually sits against the switchgear rating, and only then recommend a configuration.
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