A weather-protected generator can still be affected by rising water, wind-driven rain, blocked airflow, debris, damaged exhaust, unstable foundations or flooded downstream equipment.
Before You Start
Facility managers, emergency coordinators, operators and project teams responsible for standby power before, during and after severe weather.
A weather-event record covering water level, access, enclosure, foundation, exhaust, electrical interfaces, downstream loads and qualified release.
Keep people out of the affected area, use the approved site emergency process and contact local emergency and qualified electrical personnel. Do not walk through water to reach the generator or operate equipment to see whether it still works.
Safety Check 01
What should be confirmed before severe weather arrives?
Preparedness includes drainage, access, enclosure condition, fuel security, air and exhaust openings, communication and the elevation of generator and distribution equipment.
Record current site and drainage condition
- Record current site and drainage condition
- Confirm emergency contacts and operating authority
- Secure loose external materials through approved site work
- Verify that planned fuel and service access remains safe
Safety Check 02
Why does standing water change the access decision?
Water may conceal energized conductors, damaged surfaces, contamination and unstable ground. Visible depth does not establish electrical safety.
Restrict access before personnel approach the water
- Restrict access before personnel approach the water
- Record water extent from a safe dry location
- Do not touch enclosures, cables or metalwork in the affected area
- Require qualified inspection and isolation planning
Safety Check 03
How can wind and rain affect ventilation and exhaust?
Wind-driven rain, debris and changed pressure can block openings, damage stacks or redirect exhaust toward air intakes and occupied spaces.
Observe openings and exhaust outlets from a safe position
- Observe openings and exhaust outlets from a safe position
- Record debris, damaged supports and new soot or water marks
- Stop use if exhaust reaches people or building openings
- Have the complete airflow and exhaust path reviewed
Safety Check 04
What is required after the weather event?
Dry appearance is not proof of safe insulation, controls, fuel quality, mechanical support or downstream distribution. Return to service requires documented inspection and approved testing.
Retain photographs and event timeline
- Retain photographs and event timeline
- Identify equipment exposed to water, impact or debris
- Do not energize flooded or suspect equipment for diagnosis
- Document qualified release and staged system verification
This guidance does not provide flood entry, dewatering, electrical drying, insulation testing, storm operation or re-energization procedures. Follow the site emergency plan, local authority direction, equipment manuals and qualified-person requirements.
Common Mistakes
Conditions that require a safer decision
Walking through shallow water to check the controller
Water depth does not show whether conductors, metalwork or ground are energized or stable.
Starting the generator because the enclosure looks dry
Internal electrical, fuel, ventilation and downstream conditions may still be unsafe.
Ignoring wind direction after a storm
Changed airflow or damaged exhaust can move gases toward people and building openings.
Record to retain
Keep a record another person can verify
Weather-event timeline
Rain, flood level, wind, outage, alarms and observed changes.
Access and water boundary
Restricted zones, safe observation points and responsible contacts.
Equipment exposure map
Generator, ATS, cables, fuel, exhaust, foundations and downstream loads.
Qualified return-to-service record
Inspection, corrective work, approved testing and staged verification.
Sources and Review Basis
Sources and Review Basis
Risk-recognition references support this page; the approved project design, current equipment manuals and local qualified specialists remain controlling.
- OSHA portable generator wet-condition and electrical safety
- OSHA flood preparedness and response
- OSHA electrical safety topic
- Current project drawings, commissioning records and OEM manuals for the installed set