Data & Comms Rack Installation SWMS

Installation of 19-inch communications and data racks in server rooms, main distribution frames (MDFs) and comms cupboards is classified High Risk Construction Work under WHS Regulation 2025 Part 4.4 wherever workers must interface with energised distribution boards, live patch fields or adjacent active electrical installations. The scope covers rack assembly and floor or plinth anchoring, mounting of patch panels and power distribution units (PDUs), structured cable management, and termination of fibre optic and Cat6A/UTP cabling. Workers face simultaneous risk from arc flash on backfed PDUs, falling rack components during lifts, Class 1M laser radiation from unterminated fibre, and confined working postures inside hot-aisle cabinets. Because energised electrical work is reasonably foreseeable when racks are cut into live comms-room ring mains or backfed from a UPS, a documented Safe Work Method Statement is mandatory under WHS Reg s299 before work commences. This SWMS must be prepared in consultation with workers (s47), signed by every person performing the task, and retained for the duration of the work plus two years after any notifiable incident.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

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

1. 1Elimination — Schedule rack cut-in works during agreed change windows with full upstream isolation at the distribution board, eliminating any live electrical interface for the duration of installation.
2. 2Elimination — Pre-assemble and pre-populate racks in a ground-level staging area before final positioning, removing overhead work and reducing in-room manual handling exposure.
3. 3Substitution — Substitute traditional A-frame ladders with a certified mobile elevating work platform or rated podium step where ceiling height and floor loading of the comms room permits.
4. 4Substitution — Specify pre-terminated MTP/MPO fibre trunks in lieu of field fusion splicing to remove open laser sources and hot-work splice operations from the workspace.
5. 5Engineering — Install lockout-tagout devices and apply personal danger tags to all upstream breakers and UPS bypass switches per AS/NZS 4836:2023 isolation verification procedure before any rack-side work.
6. 6Engineering — Use floor-mounted anchor brackets and dynamic rack-lifter trolleys rated to 250kg to position and plumb cabinets, preventing tip-over during seismic bracing installation.
7. 7Administrative — Conduct pre-start brief using this SWMS, verify worker electrical licensing under AS/NZS 3000:2018 Clause 1.6, and log permit-to-work entry against the site's energised work register.
8. 8Administrative — Implement two-person rule for any task within 500mm of energised parts, with the second worker positioned at the isolation point as safety observer per AS/NZS 4836 s6.4.
9. 9PPE — Wear arc-rated coveralls minimum ATPV 8 cal/cm² to AS/NZS 4836 Appendix C, Class 0 insulating gloves tested within 6 months, and arc-flash face shield when working within the restricted approach boundary.
10. 10PPE — Use IEC 60825-rated laser safety glasses filtering 1310/1550nm during all fibre handling, cut-resistant Level C gloves for cable stripping, and steel-cap safety footwear for rack positioning.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a Tier-3 commercial office fitout in a CBD high-rise, a comms subcontractor is installing four 42RU racks into an existing operational MDF that hosts the building management system. At the 6:30am pre-start brief, the lead technician opens this SWMS on a site tablet and walks the two-person crew through each hazard line. The crew identifies that hazard 1 (arc flash on backfed PDU) applies because two of the four racks are being cut into a live ring main feeding the BMS — isolation of the entire MDF is not permitted by the building owner. The team selects the corresponding controls: upstream lockout at the sub-board, two-person rule with a dedicated safety observer at the isolation point, and ATPV 8 cal/cm² arc-rated coveralls with Class 0 gloves. Each worker signs the SWMS sign-on register, confirming their electrical licence number and arc-flash PPE test date. Mid-morning, the team discovers an undocumented backfeed from a rooftop solar inverter feeding the same bus. Work stops, the supervisor re-opens the SWMS, adds the new hazard under the field-amendment section, re-briefs both workers, and obtains fresh sign-on before isolating the inverter DC side and resuming the rack cut-in safely.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS/NZS 3000 — Electrical installations

Frequently asked questions