What we locate

Electrical Line Locating

Live power is easy to find. Dark conduit is not.

Electrical line locating finds buried power on a site: the utility service up to the meter, and everything past it that a one-call ticket does not cover, from parking lot lighting to EV charger feeds and generator runs. Loaded live circuits trace in minutes, while de-energized, spare, and conduit-only runs need active tracing or ground penetrating radar.

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What electrical line locating covers

Buried electrical runs from a utility's primary distribution feeding a pad-mount transformer, through the secondary service lateral to the meter, and then past that meter into all of the circuits the property owner installed: parking lot and site lighting, sign and gate power, EV charger feeds, well and irrigation pump circuits, generator and transfer-switch runs, solar array home runs, and the feeders tying a shop, garage, or second building back into the main panel. Conductors are copper or aluminum, either direct-buried or pulled through PVC, rigid steel conduit, or a concrete-encased duct bank. Minimum cover is set by NEC 300.5 in the US and the underground installation rules of the Canadian Electrical Code, and those minimums are shallower than most people assume, so a great deal of buried power sits inside the first two feet and low-voltage landscape lighting can be a few inches down. A strike is not like nicking a water line. Contacting an energized conductor produces arc flash and arc blast, can energize the machine and the ground around it, and injures operators and bystanders who never touched the equipment. That is why electric is marked APWA red and why it is located before anything gets driven, augered, cored, or trenched.

How electrical lines get traced

Energized, loaded AC circuits are the easiest target in the trade. Current flowing through a conductor radiates a field at power frequency, 60 Hz in North America, and a locator's passive power mode reads that field and its harmonics with no transmitter connected at all, so a locator can sweep a site and find live feeders quickly. Everything else needs an active signal. The locator applies a transmitter tone to the cable either by direct connection to the neutral, ground, or metallic sheath at a de-energized panel, handhole, or pedestal, or by placing a rated signal clamp around an insulated cable at a point where it is grounded at both ends so the induced current has a return path. Spare or empty conduit carries nothing to trace, so a sonde on a push rod or a conductive duct rodder is fed through it and tracked from the surface. Ground penetrating radar covers what neither approach reaches, since PVC conduit, concrete-encased duct banks, and abandoned runs return reflections whether or not they carry current. What the locator confirms goes down as red paint and flags, normally with a field sketch of measured offsets to permanent features, and on larger sites as GPS points or a CAD drawing that outlives the marks.

Why electrical lines are hard to find

The paradox of electrical is that the circuits most likely to be struck are the ones passive locating cannot see. Passive power mode needs current actually flowing, and it needs that current to be unbalanced enough that the fields of the outgoing and return conductors do not cancel, so a parking lot lighting circuit that is off during the day, a standby generator feed, a spare conduit left for a future tenant, an abandoned run, and a solar array's DC home runs all radiate nothing a power-mode locator can lock onto. Those are exactly the runs that appear on no drawing, because they were added over decades by different electrical contractors, and PVC conduit is non-conductive, so with no tracer wire and no accessible open end there may be nothing available to put a signal on. Once a signal is applied, electrical is the worst utility on a site for bleedover: neutrals are bonded to ground rods, building steel, and frequently a metallic water service, so the tone flows onto the water line and returns as a ghost trace with a false depth. Concrete-encased duct banks compound the problem, because six circuits in one bank read as a single target and no surface instrument can separate them. Depth taken from passive power detection is the least trustworthy number a locator reports, since the field is distorted by the return path and by every other energized thing nearby, which is why an active trace at a known frequency is preferred whenever a connection point exists.

When this job comes up

Tracing the service lateral from the transformer or pedestal to the meter
Parking lot and site lighting circuits before pole bases, footings, or bollards
EV charger feeds and new panel runs trenched across an existing lot
Generator, transfer switch, and standby feeds at hospitals, plants, and data centers
Campus and industrial primary distribution between buildings and pad-mount transformers
Solar array DC home runs and combiner trenches before ground-mount or racking work
Post-strike and pre-demolition sweeps where the site electrical is undocumented

Call one-call first

What one-call marks, and what it does not

Call 811 in the US or your provincial one-call center in Canada before any excavation. It is free, it is required by law before digging in most jurisdictions, and for electrical it brings the utility out to mark the primary and the portion of the service it owns, typically ending at the meter. Where that ownership boundary actually falls varies by service territory: in many areas the utility owns the underground secondary from the transformer or pedestal to the meter, while in others the customer owns and maintains that same lateral, in which case one-call will not mark it even though it is the incoming service, so confirm with your utility rather than assuming. Everything past the meter is private and outside one-call's scope entirely, including parking lot and site lighting, sign and gate circuits, EV charger feeds, well pumps, generator and standby runs, solar DC home runs, and the feeders between buildings on a campus or plant. Street lighting and traffic signal circuits owned by a municipality may or may not be registered with the one-call center depending on the jurisdiction. Private locating is booked as the second half of the same job: the ticket first, then a locator for the rest of the site.

How electrical lines get located

Often found on the same site

Questions

Electrical Line Locating FAQ

Does 811 mark buried electrical lines?

It marks the ones the utility owns. A one-call ticket notifies the member facility owners and the electric utility comes out and marks its primary and the service it owns, free, usually stopping at the meter. Where that boundary sits varies by service territory, and in some areas the customer owns the underground lateral from the transformer to the meter, so it does not get marked at all. Nothing past the meter is covered: site and parking lot lighting, sign and gate circuits, EV charger feeds, generator and solar runs, and feeders between buildings are the property owner's and are what a private locating company is hired to find. Always call 811 or your provincial center first, then book private locating for the rest of the site.

Can a locator find a de-energized or empty electrical conduit?

Usually, but not with passive power mode, which only reads the field radiating from current that is actually flowing. A de-energized cable, a spare duct, or a solar DC run gives a power-mode locator nothing to detect. The locator switches to an active method instead: a transmitter tone applied to the neutral, ground, or sheath at a de-energized panel or pedestal, a signal clamp around the cable where it is grounded at both ends, or a sonde or conductive duct rodder pushed through an empty conduit and tracked from the surface. Where no connection point exists, ground penetrating radar can still image PVC conduit and concrete duct banks as reflections. Each of these is slower and less certain than tracing a live loaded feeder, so tell the locating company up front which circuits are dark, spare, or abandoned.

How deep are buried electrical lines, and how accurate is the locate?

Shallower than most people expect. Code minimums under NEC 300.5 and the Canadian Electrical Code put a lot of direct-buried power inside the first two feet, and low-voltage landscape and sign lighting can sit a few inches down, while site grading after installation moves the real cover in either direction. Horizontal position on a well-coupled cable or a clean active trace is generally reliable and is marked with a tolerance zone rather than a single line, but depth is an estimate. Depth read in passive power mode is the least reliable of all, because the field is distorted by the return path and by nearby energized equipment. ASCE 38-22 classes this kind of surface geophysics as Quality Level B; only exposing the conductor, normally by vacuum excavation, reaches Quality Level A. Hand dig or vacuum excavate inside the tolerance zone no matter how clean the marks look.

How much does electrical line locating cost?

It is quoted per job rather than off a rate card. What drives the number is site size, how many circuits are in play, whether connection points such as panels, handholes, and pedestals are accessible, how much of the work is dark conduit that needs sondes or radar, and whether you want surface marks only or a drawing and GPS data as well. Describe the job once through Utility Hotline and locating companies serving your area will send their own quotes so you can compare them side by side.