Should I turn off my main breaker if I suspect a gas leak near my electrical panel?

If you suspect a gas leak near your electrical panel, do NOT touch any electrical switches or breakers - including the main breaker. Leave the area immediately, evacuate everyone from the home, and call 911 and your gas utility from outside the building.

Turning off electrical switches when gas is present can create a spark that ignites the gas, causing an explosion or fire. Even though it seems logical to shut off power, any electrical switching - including breakers, light switches, or even unplugging appliances - can generate a small arc that's enough to ignite natural gas or propane vapors.

Immediate steps for a suspected gas leak:

Get everyone out - evacuate the home immediately through the nearest exit

Don't touch anything electrical - no switches, breakers, outlets, or appliances

Don't use phones inside - cell phones and landlines can create sparks

Don't turn lights on or off - leave them as they are

Call from outside - once safely away from the building, call 911 and your gas utility (Enbridge Gas at 1-866-763-5427 in the GTA)

Why electrical panels and gas don't mix: Natural gas is heavier than air when mixed with other gases and can settle in basements where electrical panels are often located. In Toronto's older housing stock - particularly century homes in neighborhoods like Cabbagetown, Riverdale, and the Annex - basement electrical panels are commonly located near gas meters, furnaces, or water heaters. Even a tiny spark from a breaker switching can ignite gas vapors that have accumulated in the area.

Signs of a gas leak to watch for:

• Smell - the distinctive "rotten egg" odor (mercaptan additive)


• Sound - hissing near gas lines, appliances, or the meter


• Visual - dead vegetation near gas lines, dirt blowing near underground lines, or white vapor clouds


• Physical symptoms - dizziness, nausea, or fatigue (though these have many causes)

After the emergency is handled: Once the gas utility has cleared the area as safe, they may need to shut off your gas service temporarily for repairs. At that point, it's safe to have a licensed electrician inspect your electrical panel if it was in the affected area. Gas leaks can sometimes cause corrosion on electrical components, and any electrical work in areas where gas was present should be evaluated by a professional.

GTA-specific considerations: Toronto's aging infrastructure means gas line leaks are not uncommon, especially during freeze-thaw cycles that shift underground utilities. If you're in an older Toronto neighborhood with original cast iron gas mains, be particularly alert for gas odors, especially in spring when ground movement is most common.

Remember - when it comes to gas leaks, your safety is worth more than any electrical equipment. Get out first, call for help second, and let the professionals handle both the gas emergency and any electrical concerns afterward.