Depth and cable type by application
| Application | Cable / Method | Min. Depth | Permit |
|---|---|---|---|
| Outdoor receptacle | UF-B cable | 24" | Yes |
| Shed circuit | UF-B cable | 24" | Yes |
| Garage feeder | UF-B or conduit | 24" | Yes |
| Driveway crossing | UF-B @ 18" or conduit | 18" | Yes |
| Pool equipment | Conduit | Varies | Must hire a Licensed Electrical Contractor (LEC) |
This table is a quick-reference starting point — exact depth and cable requirements can vary by local amendment and site conditions. Always confirm specifics with the ESA or your electrician before digging.
Recommended: UF-B direct burial cable
Rated for direct burial without conduit in most standard applications — check local requirements before choosing between UF-B and conduit for your specific run.
Why depth matters
Burial depth requirements exist to protect the cable from being damaged by everyday digging — gardening, fence post holes, aerating a lawn — before it ever becomes a safety issue. Driveway crossings get a shallower minimum specifically because they're typically under harder, less frequently dug surfaces, but they also see more mechanical stress from vehicle weight, which is part of why conduit is often preferred there.
Why pool equipment is different
Pools combine water, bonding and grounding requirements, and specialized equipment (pumps, heaters, lighting) in ways that go well beyond standard outdoor wiring. This is one of the few categories on this list where DIY isn't really an option at all — pool electrical work must be done by a Licensed Electrical Contractor, full stop.
Before you dig
- Call before you dig to have underground utility lines located and marked — this applies to any outdoor electrical project, not just electrical ones.
- Apply for your ESA permit before starting — all new outdoor circuits require one.
- Confirm your cable type and depth against the table above and your local amendment.
- Book your inspection before backfilling the trench — most jurisdictions want to inspect underground wiring while it's still visible.
When to stop and call a licensed electrician
Any outdoor circuit is new wiring, which means it always requires a permit — this isn't a project where you can skip that step. Pool equipment, anything involving conduit runs through structural elements, or any run longer than a simple point-to-point path are all good reasons to bring in a professional from the start.