Lost A Leg Of Power? How To Tell If It Is The Utility Or Your Panel

What Does Losing A Leg Of Power Actually Mean?

A typical home supply arrives as two live legs. Each feeds roughly half of the circuits in the panel, and together they feed every 240-volt circuit — the dryer, range, air conditioning and well pump among them. A Lost leg of service means one of those feeds has failed between the street and your breakers, while the other keeps working.

That split makes the fault confusing: the home is neither fully on nor fully off. Lights in one part behave normally, sockets in another are dead, and appliances needing both legs stop, hum or run weakly. The pattern maps onto which leg each circuit sits on.

What Are The Signs One Leg Has Failed?

The clearest sign is a clean divide: about half the circuits dead at once, with no single breaker tripped, while the rest of the home works normally. Several circuits failing together in that pattern puts the problem upstream of the individual breakers — in a leg, not in one room's wiring.

Why Do Some Rooms Work Normally While Others Are Dead?

Because the panel divides its circuits between the two legs. Breakers in the Electrical panel / breaker panel alternate between legs down each side, so a failed leg takes out a scattered pattern of rooms rather than one tidy half of the house. A homeowner ringing an emergency electrician in Acampo about sockets dead in the kitchen, a bedroom and the garage at the same moment is describing that pattern.

Why Do Large Appliances Stop Or Struggle On One Leg?

Large appliances draw from both legs at once, so losing one leg removes half of what they are built to run on. Heating appliances produce little or no heat, and motor-driven ones — air conditioning, a well pump, a dryer motor — may hum, start slowly or refuse to start. A motor on reduced voltage draws harder and heats faster, so struggling equipment should be switched off, not coaxed.

Why Might Dead Circuits Glow Faintly Or Flicker Back?

A dead leg can pick up a faint feed through a large appliance still switched on: power crosses inside it from the live leg to the dead one, then reaches the dead circuits at reduced strength. Lights may glow dimly and brighten or fade as that appliance cycles. It looks like recovery; it is not. Switching large appliances off removes the faint feed and confirms the leg is still down.

How Can You Tell Whether It Is The Utility Or Your Panel?

Only measurement settles it, because the same symptoms come from faults on either side of the meter. A pro measures with a Multimeter at the Service entrance conductor and works downstream: what arrives from the Service drop, what passes through the Meter base / meter pan, what the Main breaker / main disconnect hands to the panel, and what each Bus bar then carries. Where a healthy reading turns into a missing leg is the dividing line.

If a leg is already missing where the supply enters, the fault belongs to the Electric utility (service provider) — a failed connection or damaged conductor on its side — and the pro passes the readings on so the utility crew knows what to look for. If both legs arrive correctly but one is missing past the main breaker, the fault is in the home's equipment: a failing main breaker, a heat-damaged bus connection or a loose lug. A caller asking an emergency electrician in Acton or an emergency electrician in Adelanto who fixes it should expect that measured answer, not a guess.

What Causes A Leg To Fail In The First Place?

Heat and weather cause most cases. A Loose connection on one leg arcs and overheats under load until it fails open, and Corrosion (bus bars, lugs, outdoor equipment) raises resistance at a joint the same way, slowly cooking it. Storm damage to service equipment can tear a conductor at the mast, Water intrusion in an outdoor meter base corrodes the jaws gripping the meter, and a Lightning surge can damage a main breaker so one side no longer carries current.

Age plays its part: connections loosen over years of heating and cooling cycles, which is why Torqueing panel connections and a Thermal imaging / infrared scan under Load testing appear in a thorough check — a failing joint runs hot long before it runs dead, as an emergency electrician in Agoura Hills called out after a storm often finds.

What Should You Switch Off While One Leg Is Down?

Switch off every large appliance until the leg is restored: dryer, range, air conditioning, water heater, well pump and any EV charger circuit. Motors starved of voltage overheat, and appliances spanning both legs create the faint backfeed that makes dead circuits flicker. Leave lighting breakers as they are, avoid a Space heater load on the surviving leg, and do not reset anything repeatedly.

Safe isolation / de-energising still governs any work at the panel: the surviving leg is live, and the dead leg can become live without warning if the utility restores its side. Guidance for an emergency electrician in California follows CSLB requirements, and an emergency electrician in Florida works under DBPR rules, but the safety order is the same in both states.

What Affects The Cost Of Fixing A Lost Leg?

Only the factors can be stated honestly — the figure depends on which side of the meter the fault sits on and what the heat has damaged. A utility-side fault is the utility's repair, so the homeowner's cost may be limited to the diagnostic visit. On the home's side, a failed main breaker is contained; a heat-damaged bus or meter base is larger, and damage spread into the panel can lead toward Panel upgrade / service upgrade work. Permit and inspection requirements through the Local building / permit department, and whether the utility must disconnect the service, also shape the total. Any charge is agreed with the independent pro before work starts.

When Should You Call About A Lost Leg?

Call as soon as the pattern shows — half the home dead and large appliances failing together is not a wait-and-see fault. Call immediately, and keep away from the panel, if it buzzes, runs hot, sparks or smells of burning. One free call connects you with an independent local pro with 20+ Years Of Experience who can typically arrive in 30–60 minutes, measure both legs through the service, and say plainly whether the fix belongs to the utility or to your equipment.