Data-Centre Busbar, UPS & Lithium Battery Install SWMS

Data-centre power installation is the high-energy electrical work that fits and commissions the power chain for a data hall: overhead and underfloor busbar, the uninterruptible power supply, and lithium-ion battery energy storage racks. The dominant hazards are severe arc flash and electric shock on the busbar, UPS and switchboards, direct-current stored energy in the battery string that cannot be fully isolated, lithium thermal runaway producing fire and toxic off-gassing, heavy module and battery-tray handling, falls at raised-floor edges and high-level busbar, and a confined underfloor void. This SWMS covers the busbar, UPS and lithium battery installation and commissioning; it does not cover the upstream main switchboard, the design and certification of the battery energy storage system, or the fire-suppression system, which are documented separately.

Under the model Work Health and Safety Act 2011 and the harmonised Work Health and Safety Regulations adopted in each state and territory, this is high risk construction work on several grounds: it is carried out on or near energised electrical services, in an area that may have a contaminated or flammable atmosphere from battery off-gassing, where a person can fall more than two metres, and in or near a confined underfloor void; Victoria operates the equivalent provisions under the Occupational Health and Safety Act 2004 and Occupational Health and Safety Regulations 2017. The wiring rules and an arc-flash risk assessment follow AS/NZS 3000, the battery system follows AS/NZS 5139 with cells certified to IEC 62619, emergency eyewash and shower follow AS 4775, and a battery emergency management plan with fire-service consultation applies where the installation exceeds the applicable threshold.

Failure to meet the primary duty of care is prosecuted under the Category 1 to 3 offences in the Work Health and Safety Act (and the equivalent provisions in Victoria's Occupational Health and Safety Act 2004), with maximum penalties indexed in most jurisdictions, imprisonment available for individuals, and a separate industrial manslaughter offence; current figures follow the prevailing penalty schedule of the responsible state regulator. This document is structured to satisfy the safe work method statement content requirements of the harmonised regulations and documents a controlled, de-energised method for high-energy power infrastructure.

Hazards identified

11 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination: Isolate, lock out and work de-energised, with an arc-flash risk assessment defining boundaries and a licensed electrical worker, where energised work cannot be avoided.
2. 2Engineering: Use string isolation links and insulated tools, treat the battery as always live, and follow the AS/NZS 5139 connection sequence; wear arc-rated personal protective equipment.
3. 3Elimination: Remove damaged cells, use cells certified to IEC 62619 and an installation to AS/NZS 5139 with ventilation and gas detection, and maintain a battery emergency management plan.
4. 4Engineering: Use mechanical handling and rated lifting for heavy UPS modules and battery trays, with multi-person handling; wear gloves and footwear.
5. 5Engineering: Use floor-panel covers, edge protection and an elevating work platform, with exclusion and a fall-arrest harness where a residual fall risk remains.
6. 6Elimination: Work from outside the underfloor void where possible; otherwise ventilate and use a confined-space permit where it applies.
7. 7Elimination: Remove damaged cells, provide a spill response and AS 4775 emergency eyewash and shower, and apply handling controls; wear gloves and eye protection.
8. 8Engineering: Provide temporary bracing and fix tall racks to the structure before loading.
9. 9Engineering: Deburr busbar and racks and handle safely; wear cut-resistant gloves.
10. 10Engineering: Use panel lifters and handle raised-floor panels safely with hands clear of pinch points; wear gloves.
11. 11Engineering: Manage cabling with housekeeping and defined routes; wear safety footwear.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

A critical-power contractor is installing the power chain for a new data hall: overhead and underfloor busbar, the uninterruptible power supply, and lithium-ion battery energy storage racks. The work is high risk construction work on several grounds - it is on or near energised electrical services, the battery room can develop a flammable or toxic atmosphere if a cell fails, there are falls at raised-floor edges and high busbar, and the underfloor void can be a confined space - so the engineer builds the safe work method statement around arc flash, stored energy, thermal runaway, falls and the void. The busbar and switchboard work is done de-energised wherever possible, to an arc-flash risk assessment that defines boundaries, by a licensed electrical worker, with arc-rated personal protective equipment where any energised work is unavoidable. The battery string is treated as always live because it cannot be fully isolated; string isolation links and insulated tools are used and the AS/NZS 5139 connection sequence is followed. Cells are certified to IEC 62619 and installed to AS/NZS 5139 with room ventilation and gas detection, and a battery emergency management plan, developed with the fire service where the installation exceeds the applicable threshold, governs a thermal-runaway event. Heavy UPS modules and battery trays are moved with mechanical handling and rated lifting, and tall racks are braced and fixed to the structure before they are loaded. Raised-floor edges are protected, high busbar is reached from an elevating work platform, and the underfloor void is worked from outside where possible or under a confined-space permit with ventilation where entry is needed. An AS 4775 eyewash and shower and a spill response cover the electrolyte risk. Workers sign on to the statement before starting, the arc-flash assessment, isolation and commissioning records are kept, and the signed statement is held on site for the responsible state regulator.

Related legislation

• Work Health and Safety Act 2011 (harmonised; enacted in all states and territories except Victoria, which applies the Occupational Health and Safety Act 2004), s.19 — Primary duty of care to workers and to other persons at or near the workplace
• Harmonised Work Health and Safety Regulations, section 291 — Defines high risk construction work (Victoria: Occupational Health and Safety Regulations 2017, Part 5.1)
• Harmonised Work Health and Safety Regulations, section 299 — Content and review requirements for a safe work method statement for high risk construction work (Victoria: regulation 327; Tasmania: regulation 312)
• Harmonised Work Health and Safety Regulations, Part 4.7 — Electrical safety: the prohibition on energised electrical work except where de-energising is not reasonably practicable and the prescribed conditions are met, with duties for RCD protection and testing (Victoria applies the Occupational Health and Safety Regulations 2017 and state electrical-safety legislation)
• Harmonised Work Health and Safety Regulations — Confined spaces and hazardous atmospheres: entry permit, ventilation and gas-detection duties where an underfloor void or battery off-gassing applies
• State dangerous-goods and battery-storage requirements — A battery emergency management plan and fire-service consultation where the lithium-ion installation exceeds the applicable threshold

Frequently asked questions