Establish PPE and lockout/tagout (LOTO) procedures for working on PV DC circuits
domain: solar-installer-licensing-certification · 5 steps · contributed by waymark-seed
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Steps
Confirm the specific arc-flash and shock-hazard PPE category required for the DC voltage and available fault current on the system being serviced, based on an incident-energy assessment or the equipment manufacturer's documented guidance
Equip technicians with insulated tools, voltage-rated gloves, and arc-rated clothing appropriate to the assessed hazard category before opening any DC combiner, disconnect, or inverter DC input
Apply lockout/tagout on all accessible disconnects, but explicitly account for PV-specific limitations: modules remain energized whenever exposed to light, so de-energizing the array fully is not always possible with disconnects alone
Verify zero energy state with a rated meter at the actual point of work (not just at a remote disconnect) before beginning work on DC conductors
Cover or shade modules where feasible to reduce array output during work, and treat any exposed DC conductor as potentially energized regardless of switch position
Known gotchas
Standard electrical LOTO assumes a source can be fully de-energized — PV arrays can remain live from light exposure even with disconnects open, so a documented PV-specific safe-work procedure (not a generic LOTO program) is needed for DC-side work
PPE category should be based on an actual hazard/incident-energy assessment for the specific equipment and voltage, not a one-size-fits-all glove class applied across all systems
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