Electrical safety demands a precise answer to the question “Is voltage present?”

Grace Engineered Products Voltage IndicatorKeeping personnel away from live voltage is foundational to electrical safety. Thru-door voltage indicators provide visibility of voltage from outside the enclosure without exposing personnel to voltage. Workers performing mechanical LOTO must isolate electrical energy. An externally-mounted voltage detector provides a means to check voltage inside an electrical panel. Without a voltage indicator, a mechanic performing mechanical LOTO would be required to work in tandem with an electrician using a voltmeter to physically verify voltage inside an electrical panel. In this case, the electrician is exposed to voltage. With thru-door voltage detectors, the mechanic can verify zero electrical energy without any exposure to voltage.

Voltage is the common denominator in an electrical accident or an arc flash; no voltage means no accident, no arc flash. While performing electrical LOTO with a thru-door voltage detector installed, the electrician can pre-check the internal voltage state without opening the enclosure. Next, the electrician should replicate a zero voltage reading with his voltmeter as per NFPA 70e 120.1(5). This low-cost, redundant voltage-verification task reduces arc flash risk and increases electrical safety for workers.

Grace Engineering SafeSide thru-door voltage indicators provide electrical safety information while the panel doors are safely closed. This “one-size-fits-all” solution detects 3-phase AC or DC voltage. The encapsulated construction and redundant circuit design means rugged reliability. SafeSide products are available with flashing LEDs and non-flashing LEDs.


Posted on Thursday Sep 07, 2017 | loto, nfpa70e, voltage-indicator,