Why this matters
Hydrovac is the safest method we have for digging around buried utilities — but "safer than mechanical digging" isn't the same as "risk-free." Pressurized water + a steel wand near energized cable can still kill you. Most documented hydrovac fatalities involve electrical contact. Read that line again, then we'll go through the controls.
Three real risks on any hydrovac job near electrical
- Direct contact with energized conductor. Wand, hose, or operator touches a live cable. Cable insulation may be intact but compromised — we don't rely on it.
- Step potential / arc through soil. Damaged or faulted underground cable can energize the surrounding soil. You don't have to touch the cable — standing in a wet excavation while energized soil is between your boots is enough.
- Water-as-conductor strike. Pressurized water from the wand contacts an energized component (cable, transformer terminal). Path of least resistance is back through the wand, the operator, the truck.
Controls — do these every time
Before the dig
- Confirm ND One Call ticket is current — locate paint markings on the ground match the ticket. If markings are faded, weathered, or absent, STOP and re-mark.
- Review the locate sketch. Know what utilities are present, what depth, what voltage if it's electrical.
- Walk the dig area. Look for transformers, pad-mount equipment, riser poles, or any sign of overhead-to-underground transitions. These are high-risk corners.
- Confirm overhead clearance. Wand position, boom position, hose path — none should approach energized overhead within OSHA minimum distances (10 ft minimum for <50 kV, more for higher voltages).
PPE on every operator
- Class "G" or "E" rated dielectric boots — minimum.
- Class 0 (1,000V) rubber gloves with leather protectors when working <3 ft from any electrical.
- Hard hat (Class E for electrical).
- FR shirt + pants for any work near transformers or substations.
- Safety glasses + face shield. Pressurized water + dirt under pressure WILL hit you.
During the dig
- Reduce pressure as you near the locate mark. 1500 PSI for soil breakup, drop to 750-1000 PSI within 12 inches of any utility, never exceed wand manufacturer's spec for utility exposure.
- Use the wand at an angle — don't point it straight at the suspected utility. Sweep parallel to it.
- One operator on the wand at a time. Spotter watches the excavation. If anything looks off (color change in soil, sparks, unexpected material), STOP.
- Keep the work zone clear. No bystanders, no foot traffic across hose lines.
If you contact electrical
- Don't move. If you can't safely step away, don't. Step potential kills more often than direct contact.
- Operator stays in the truck if possible. If energized, the truck is at the same potential as the ground around it. Stepping from truck to ground creates the dangerous path.
- Call 911 + the utility's emergency line. Most ND utilities have a 24/7 line on the locate ticket.
- Don't approach a downed worker until the utility confirms de-energized. Stay back at least 30 feet.
Discussion questions for the crew
- What's the closest you've worked to an energized line on a hydrovac job? What controls did you have in place?
- If your wand touched a live conductor right now, what's your step-by-step response?
- Do you know what voltage class your dielectric boots are rated for? When were they last inspected?
- If a locate is wrong — utility found at a different depth or location than marked — what's our STOP-and-call protocol?
Bottom line
Most strikes are preventable. The dangerous combination is time pressure + assumption that locates are perfect + complacency from a thousand uneventful jobs. Slow down at the locate mark. Watch the soil. Trust the spotter. Go home tonight.