Commercial Electrical Troubleshooting in Toronto
Intermittent problems cost businesses the most: the breaker that trips twice a week, the lights that flicker only when the HVAC starts, the machine that faults at random. Portman traces commercial electrical problems to the cause, so the fix holds.
- Facility managers
- Restaurant operators
- Office managers
- Building operators
Call Us If…
Real situations, not a capabilities list. If one of these sounds familiar, you're in the right place.
- 01A breaker trips intermittently and resetting it has become routine.
- 02Three-phase equipment hums, runs hot or won't start — possibly a lost phase.
- 03Lights flicker or dim when large equipment starts.
- 04A 347V lighting circuit is partially out across a floor.
- 05Someone smells something hot near a panel or a device is discoloured.
- 06A previous repair didn't fix the problem.
Diagnosis Before Parts
Swapping breakers and devices until a problem goes away is expensive and often hides the real fault. Our troubleshooting follows the circuit: what it feeds, how it's loaded, where it's terminated and what changed. Depending on the fault, that means voltage and current measurements under load, insulation testing on suspect conductors, phase checks on three-phase equipment and inspection of terminations for heat damage.
What Commercial Faults Usually Turn Out To Be
- Overloaded shared circuits after equipment was added over the years
- Loose or heat-damaged terminations in panels, disconnects and devices
- Failed breakers, contactors or overload relays
- A lost phase from a failed fuse, breaker pole or termination upstream
- Ground faults in damp areas — kitchens, washrooms, exterior signage
- Damaged conductors in conduit, ceiling spaces or slabs
- Undocumented alterations made by previous tenants
Troubleshooting Higher-Voltage Commercial Systems
Many Toronto commercial buildings run lighting at 347V and distribution at 600V, stepping down through transformers to 120/208V for receptacles. Faults can sit at any level: a 347V lighting circuit, a transformer primary, a 600V feeder or a 208V branch. We work across the whole system and coordinate any required shutdown with you before isolating equipment.
You Get the Cause, Not Just a Reset
When the fault is found, you get a plain explanation of what failed, why, and what the repair options are — including whether the underlying cause is load, age, damage or a past installation. That record is useful for landlords, insurers and whoever maintains the building next.
Troubleshooting Visit, Step by Step
- STEP 1
Tell us the symptoms, when they happen and what was changed recently.
- STEP 2
The electrician reviews the panel schedule and affected equipment on site.
- STEP 3
Testing under safe conditions isolates the faulted circuit or component.
- STEP 4
You receive the cause and repair options before work proceeds.
- STEP 5
The authorized repair is completed and the circuit is re-tested.
- STEP 6
Findings are documented for your records.
Safety first. If you see smoke or fire, or someone has been shocked, call 911 first. Do not open panels, reset repeatedly tripping breakers or work on live equipment yourself — keep people clear and call us. Urgent? Call 647-835-7757 or see commercial emergency service.
Something Not Working? Book a Service Call.
Describe the problem, add photos if you have them, and tell us how urgent it is. For emergencies, call instead — forms are not monitored like the phone line.
Planning a project instead?
Send drawings, specs and schedule through the project quote form.
Frequently Asked Questions
Real Commercial Work
Read about documented jobs in our project gallery.
Related Commercial Services
Need commercial electrical service?
Call Portman Electric · 647-835-7757