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| Vault and Manhole Emergencies |
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| Even a small fire in an underground vault or manhole can create an environment that is immediately dangerous to life and health. Consider every vault and manhole incident a confined space emergency involving combustible and toxic gases, hazardous materials and an explosive atmosphere. |
| For more first responder safety information and to order our FREE safety kit, visit the SCE e‑SMARTresponders website. |
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Do Not Enter! |
When an underground vault or manhole is emitting smoke or flames, let the fire burn unless instructed otherwise by the incident commander, and DO NOT ENTER! Establish a safe perimeter, reroute traffic and notify Southern California Edison (SCE). Protect exposures while you wait for our personnel to arrive. |
Test the Atmosphere |
Electric cable insulation and other flammable utility equipment may release highly reactive, toxic and combustible gases, including elevated concentrations of carbon monoxide. These gases may travel through ducts to structures and other subsurface vaults some distance away. Monitor the atmosphere around manholes and take these precautions: |
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If you detect combustible gas at flammable concentrations near a manhole, keep fire personnel and vehicles away, eliminate spark hazards, reroute traffic and evacuate the area. |
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Do not open vaults or remove manhole covers, as this could introduce oxygen and bring a flammable atmosphere into the explosive range. |
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Never park over or near a manhole cover. An explosion in a manhole can propel the cover into the air with great force. |
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If Victims Are Involved |
If you must assist a victim or downed responder who is in danger inside a manhole or vault, do not enter until SCE has confirmed all underground electrical equipment has been de-energized. Wear full personal protective equipment and self-contained breathing apparatus, and follow your department’s safety procedures for confined space entry and rescue. |
| Learn More |
| Find additional utility safety tips, case studies, instructional videos and educational tools at sce.e‑smartresponders.com. |
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