Electrical Line Locating in California

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.

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.

Private locating is quoted per job rather than off a published rate. What moves the number is how much ground has to be covered, how many utilities are in play, whether the lines are metallic or plastic, how reachable the meters, valves, and tracer wire access points are, and whether you need surface marks only or a drawing and GPS data as well. Across California the number also moves with travel distance and local ground conditions, so companies quote the specific job. Describe it once through Utility Hotline and locating companies working that part of California send you their own quotes.

Only on the public side. DigAlert (Southern CA) / USA North 811 (811) is free, is required by law before excavation in most jurisdictions, and notifies its member facility owners so they mark the lines they own, which generally means up to the meter or the right-of-way. Membership is not universal, so how much of a service lateral gets marked can vary from one system to the next. Nothing on the private side, meaning past the meter or the property line, is in scope anywhere in California, and that is the ground a private locating company covers. Place the ticket, book the private locate, and use both.

Coverage is settled one request at a time rather than off a published service-area map. Electrical Line Locating requests arrive from cities across California, spanning the West, and go to the companies working that particular ground, since electrical lines are routine work for a private locating company. Coverage runs deeper around the larger metros, and some crews travel for rural, agricultural, and multi-site work. Tell us the job site and we send your request to the companies covering it.