Three Men at the North-East Fence
You are the shift supervisor for a private guard company at a 132/33 kV injection substation on the edge of a state capital. Nine guards are on the contract; four are on your 12-hour night shift: a gate post, a control-room liaison, a roving patrol and you. The site has one gate, a 2.1 m chain-link fence topped with three strands of barbed wire, and CCTV covering the gate and the transformer yard but not the north-east fence line, which runs behind a drainage reserve. Guards are unarmed, carry batons and torches, and post orders say 'challenge verbally, do not engage'. At 02:40 the gate guard radios that three men are cutting the mesh at the north-east corner, roughly 60 m from transformer bay 2. The patrol guard is 200 m away on the south side. Two minutes later the utility control room reports a trip alarm on feeder 3 and asks whether anything is happening at the station. Police response in this area has averaged 25 to 40 minutes; the NSCDC divisional office is 12 km away.
1. Set out your decisions and the exact sequence of actions for the next five minutes, and state the principle that fixes the order.
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Principle: people, plant, perimeter, paperwork - in that order. A dead guard is a worse outcome than a cut fence, and an unarmed man at baton range against three intruders is a casualty waiting to happen.
- Hold the gate (0-30 s). The gate guard stays put and keeps reporting. Never strip the only entry/exit control point; a second team walking in behind the first is a common pattern.
- Fix the picture (30-90 s). Ask the gate guard for number, clothing, tools, direction of travel, and whether a vehicle or a lookout is waiting. Order the patrol to stop 40-50 m short, use cover, and light the group from a distance while staying on the radio.
- Do not close in. Three men with cutters may have matchets and a buyer waiting. Post orders say verbal challenge only; I would challenge loudly from inside the fence line and trigger the site siren, which often scatters them without contact.
- Cover the asset, not the hole. Cable theft at a substation is usually the first move before the transformer is touched, so the patrol goes between the breach and transformer bay 2 rather than standing at the gap.
- Tell the control room now that feeder 3 should be treated as a possible interference trip, not a routine fault, and ask them to hold auto-reclose and send their own security.
- Then call police and the NSCDC divisional office. With a 25-40 minute response, my job for the next half hour is to observe, deter and keep a running description, not to arrest.
2. State what information you would pass in the first ten minutes, to whom, and in what order - and what you would deliberately not pass or do.
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Order matters because each recipient acts on different facts.
- Utility control room (already open line): breach at the north-east corner, three intruders, feeder 3 trip coincides - they decide whether to de-energise or hold. They are the only people who can stop the plant hurting someone.
- Company control room / duty manager: site, time, number of intruders, current guard positions, whether the plant is at risk, and what I have already done. They escalate to the client and decide on relief staff.
- Police: location with a landmark, grid position if known, number of persons, weapons seen or not seen, direction of escape, my call-back number, and the fact that guards are unarmed. Give the gate description so a response vehicle is not waved past.
- NSCDC divisional office: same factual summary, framed as an attack on designated critical infrastructure, so it is logged as such.
What I would not do: I would not tell police 'armed robbers' if I have only seen cutters - an inaccurate escalation can produce a violent response. I would not give the control room my guess about whether the trip was caused by the intruders; I would give them the timing and let their engineers judge. I would not name or accuse any individual over the radio, and I would not send the patrol to pursue once the men leave the compound, because pursuit takes guards off the site and into the drainage reserve at night.
3. The men flee when the patrol's torch beam hits them, leaving bolt cutters and a 2 m gap in the mesh. Set out your actions until the day shift arrives, and identify the three changes you would make to the post orders.
Read the worked answer
Until handover:
- Secure before you tidy. Keep the patrol covering the gap from inside; do not immediately start repairing, because a return while guards are bent over the fence is exactly the second visit you want to prevent.
- Preserve, do not clean. Note and photograph the cut section, the dropped tools, footprints and any tyre marks in the drainage reserve. Keep the bolt cutters where they fell, covered if it rains, handled minimally; they may carry prints.
- Record times. Intrusion observed, challenge given, police call, police arrival, control room notification. Contemporaneous times are what a police statement or an insurer will test.
- Make the site defensible again before dawn: temporary welded mesh or a vehicle parked across the gap, plus a guard on that side, so the plant is not open all night.
- Write the incident report before sleeping, and hand over to the day supervisor verbally as well as in the book.
Three post-order changes:
- Cover the CCTV blind side. The north-east fence behind the drainage reserve had no camera and no lighting; that is where they cut, which is not a coincidence.
- Replace 'challenge verbally, do not engage' with a defined response ladder - observe, report, deter, withdraw - with named positions for a breach, because the current order leaves what to do with the patrol undefined.
- Set a standing trigger to wake the control room on any simultaneous trip, so a guard is not the only person deciding whether a fault is a fault.