When the water drops, most factories want the machines running again straight away. For the electrical system, this is the moment to slow down: panels, cables and motors that were underwater may look fine yet still conduct through damp silt or trapped water inside. These five steps need no special equipment and keep people safe until a qualified person can inspect in detail.
Why not re-energize as soon as the water recedes?
Because insulation on submerged equipment is usually badly degraded even when surfaces look dry. Silty water collects inside panels, cable terminations and motor windings, so a leakage current or short circuit can appear on the very first closing, causing electric shock, fire or damage to several devices at once. Clear water on the outside does not prove the inside is dry.
Step 1: Why keep the supply isolated and not re-close it yourself?
Make sure the main breaker and the branch breakers serving the flooded area stay open. If a breaker has tripped, do not try closing it to see what happens. If the transformer room or main switchboard was flooded, tell the utility and your technical manager before anyone touches the equipment.
A standby generator should only feed the loads through a transfer switch or interlock designed for it. Connecting it directly can back-feed the grid and endanger line workers outside.
Step 2: What should you record about the water level and the affected equipment?
Mark the peak water level on a wall or column and note the time. Make a quick list of what was submerged: panels, distribution boards, motors, pumps, drives, sockets, lights and junction boxes. The list sets the order of inspection and later helps you decide whether panels should be raised in the next upgrade.
Step 3: How do you cordon off wet areas and wet equipment?
Barricade or tag the flooded zones as "do not energize", and lock panels where locks exist. Keep workers out of standing water near panels, sockets and temporary cables. Tell cleaning crews not to spray water or wipe electrical equipment with wet cloths.
Step 4: Why photograph everything before cleaning?
Take pictures of panels (doors closed and open), equipment nameplates, waterlines on enclosures and silt on the floor. The photos serve three purposes: briefing the inspecting engineer, supporting an insurance claim if you have one, and comparing before and after repairs. Clean up only after you have taken them.
Step 5: Call a qualified person before power is restored
The last step is to let a competent technician clean, dry and test insulation, and decide which items can be reused and which must be replaced. Switchgear, contactors, relays and motors that were submerged generally need more thorough testing than equipment that was only damp on the outside.
The full inspection sequence, from the main board down to the loads, is in Factory electrical systems after a flood: checks before re-energizing.
If your facility in Da Nang or nearby provinces needs an inspection before power is restored, BILOCO can help under its electrical systems and M&E maintenance services. Contact details are at the bottom of the page.
Frequently asked questions
Because insulation on submerged equipment is usually badly degraded even when surfaces look dry. Silty water collects inside panels, cable terminations and motor windings, so a leakage current or short circuit can appear on the very first closing, causing electric shock, fire or damage to several devices at once. Clear water on the outside does not prove the inside is dry.
Make sure the main breaker and the branch breakers serving the flooded area stay open. If a breaker has tripped, do not try closing it to see what happens. If the transformer room or main switchboard was flooded, tell the utility and your technical manager before anyone touches the equipment.
A standby generator should only feed the loads through a transfer switch or interlock designed for it. Connecting it direct…
Mark the peak water level on a wall or column and note the time. Make a quick list of what was submerged: panels, distribution boards, motors, pumps, drives, sockets, lights and junction boxes. The list sets the order of inspection and later helps you decide whether panels should be raised in the next upgrade.
Barricade or tag the flooded zones as "do not energize", and lock panels where locks exist. Keep workers out of standing water near panels, sockets and temporary cables. Tell cleaning crews not to spray water or wipe electrical equipment with wet cloths.
Take pictures of panels (doors closed and open), equipment nameplates, waterlines on enclosures and silt on the floor. The photos serve three purposes: briefing the inspecting engineer, supporting an insurance claim if you have one, and comparing before and after repairs. Clean up only after you have taken them.
