Utility Strike Prevention: A Guide for Site Managers

Underground utility strikes remain among the most common — and most preventable — incidents on UK sites. A single strike can shut a site for days, injure or kill an operative, cut services to thousands of homes, and bring significant financial and reputational damage. As the site manager, you are the person best placed to make sure the right procedure happens every time ground is broken.

Why strikes still happen

The technology to locate most services before excavation exists and is standard issue. Strikes continue because the root causes are almost always human: poor pre-dig survey technique, time pressure overriding safe procedure, expired or missing training, and failure to consult service plans. You cannot control every swing of every bucket — but you can control the systems, culture and checks that make an unsurveyed dig unlikely.

Before any excavation starts

• 01Obtain up-to-date service plans from all relevant utility companies — available on site before digging begins. Plans are never perfectly accurate, but an operative without them is working blind.
• 02Confirm the surveying operative holds a current cable avoidance qualification.
• 03Confirm they have working equipment and can use it in all four locating modes.

Training is not a tick-box

A current card confirms the operative passed a course. It does not confirm what they are doing on site today. Competency drifts over the three-year life of a card, especially if the kit is used rarely or shortcuts have crept in from colleagues. Watch how surveys are actually done: is the Genny connected first? Are all four modes used? Is everything found actually marked? If any answer is no, the training has not translated into practice, and that gap is yours to close — independent on-site assessment exists for exactly this.

Supervision and culture

The biggest single risk factor is time pressure. When the programme is tight, the pre-dig survey is the first thing to suffer, because it is the easiest thing to skip — and nobody sees you skip it until something goes wrong. Build survey time into the programme rather than treating it as an overhead. Call out shortcuts even when the team is behind. Make it normal for an operative to say 'I need to scan this properly' without being told to hurry up.

Equipment

A CAT with a flat battery, a damaged Genny, or a unit out of calibration is not fit for purpose. Kit is checked before use each day; faults are reported and dealt with, not worked around. If the equipment is not working, the excavation does not start.

When things go wrong

• 01Stop all work in the affected area immediately.
• 02If there is any possibility of a gas leak, exposed live electricity or a ruptured main, evacuate and call the emergency services. Do not attempt to repair or re-energise anything.
• 03Report the incident to the network operator and your principal contractor.
• 04Preserve the scene and the evidence: the plans in use, the equipment settings, who was surveying and supervising. The investigation needs all of it — and so does preventing the next one.