Grace Technologies Fiber Optic Live Line Indicator Series

Grace Technologies’ Fiber Optic Live Line Indicator Series is now available in two dedicated models for 4- and 5-wire wye (Y) power systems. Known in the Australian market as live line indicators, these advanced permanent electrical safety devices (PESDs) are designed to align with AS/NZS 3000:2018 standards, addressing the evolving safety and compliance needs of Australian industries.

Each model is engineered for its specific wye configuration, delivering visual voltage presence indication at the enclosure door with zero volts brought to the door — supporting safer mechanical and electrical lockout/tagout procedures. This thru-door indication approach allows workers to confirm voltage status without direct exposure to live energy, reducing arc flash and shock hazards while maintaining compliance with Australian safety regulations.

The devices are certified CAT III 1000 V, CAT IV 600 V, and Class I, Division 2 hazardous location rated, with an operational rating up to 1100 VAC/VDC. They install through a standard 30 mm knockout and are available in two cable lengths (36″ and 72″) for flexible panel set-ups. They are durable, with fully potted construction and an IP69 rating for demanding environments.

Applications include panel boards, disconnect switches, power distribution panels, motor starters, MCCs/MCC buckets and variable frequency drives (VFDs). The devices are suitable for high-risk environments such as mining, infrastructure, utilities and manufacturing, and for panel builders, OEMs and system integrators seeking safety-first designs without compromising performance.

Designed to reduce incident energy exposure by keeping panel doors closed during voltage verification, the series also improves maintenance efficiency. Additional troubleshooting capabilities include phase loss indication and detection of stuck blades or unexpected current paths to ground.