HVAC Electrical | Lumen & Wire

Modern commercial and industrial HVAC plant demands an electrical infrastructure that is engineered with the same rigour as the mechanical systems it serves. At Lumen & Wire, we design and install dedicated supply and sub-mains for chiller sets, air-handling units, variable refrigerant flow systems, cooling towers, and the full spectrum of mechanical plant found in Melbourne's high-rise, healthcare, and industrial sectors. Every installation is sized for realistic demand diversity, future expansion, and the thermal cycling that separates HVAC electrical work from standard commercial switchboard fit-outs.

Our licensed electrical contractors carry deep working knowledge of NCC Section J compliance as it applies to energy-use intensity, motor efficiency classes, and metering obligations. We treat Section J not as a paperwork exercise but as an engineering constraint that shapes how we specify conductors, switchgear, power-factor correction, and sub-metering from the very first design conversation. The result is a system that passes JA compliance reporting and delivers measurable energy performance across its service life.

Motor Controls, Variable Speed Drives, and Drive Integration

Variable speed drives are now standard on chiller primary pumps, AHU supply and return fans, cooling tower fans, and condenser water pumps. Correct drive installation is not simply a matter of terminating cables: harmonic mitigation, motor cable length limits, output reactors, EMC screening, earth fault management, and bypass contactor arrangements all require careful coordination. Our technicians are experienced in commissioning VSDs from Danfoss, ABB, Schneider, and Siemens and will work directly with mechanical commissioning agents to map speed references, overload curves, and PID setpoints to actual plant behaviour.

Dedicated sub-mains and distribution boards sized to HVAC load schedules with correct diversity factors
VSD installation, cabling, bypass, and output reactor selection per manufacturer and AS/NZS 3000 requirements
Motor starter panels for DOL, star-delta, soft-start, and electronic control arrangements
Power-factor correction packages integrated to HVAC boards to maintain site power factor under Part Load conditions
NCC Section J sub-metering for HVAC energy end-use separation and reporting
ATS and essential services wiring for life-safety-linked HVAC systems in Class 9 buildings

BMS, BACnet, and Modbus Integration

Building management systems are only as reliable as their field wiring and device integration. Lumen & Wire provides trunk and field-level cabling for BACnet/IP, BACnet MS/TP, and Modbus RTU networks that connect controllers, variable air volume boxes, chiller plant controllers, FCU wiring centres, and metering gateways. We work alongside BMS programmers and mechanical controls contractors, handling the electrical scope cleanly so that commissioning is not delayed by cabling defects or incorrect termination practices.

Where existing BMS infrastructure is being extended or upgraded, we undertake network audits, segment isolation, and cable remediation before new devices are brought online. Our documentation packages include termination schedules, network segment drawings, and device address registers that support handover to building facilities teams without ambiguity.

Technical Specification

At a glance

SupplyDedicated HVAC sub-mains

ControlVSD, contactors, sensors

IntegrationBMS / BACnet / Modbus

PlantChillers, AHU, VRF

ComplianceAS/NZS 3000, NCC J

Frequently Asked

HVAC Electrical — your questions answered

We manage the electrical installation scope in full, including power, controls cabling, and field device wiring. BMS programming and graphics are typically a separate mechanical controls scope, but we coordinate closely with those contractors and can manage that relationship on your behalf during construction.

We design sub-metering arrangements, motor efficiency specifications, and power-factor correction to meet Section J energy-use intensity targets from the outset. We produce the supporting documentation required by the certifier and coordinate with the mechanical NCC assessor to ensure the electrical scope contributes correctly to the building's overall compliance pathway.

Yes. We offer VSD commissioning and fault-finding as a standalone service. This includes drive parameter review, output waveform measurement, harmonic assessment, and verification that earthing and screening arrangements meet both the drive manufacturer's requirements and AS/NZS 3000.

We plan all isolations, board shutdowns, and cabling runs to minimise disruption to occupied tenancies. Where extended outages are unavoidable, we coordinate with building management to schedule works outside business hours and provide temporary supply arrangements where required.