As a warehouse or facility manager, your primary focus is keeping operations moving, inventory organized, and staff productive. However, there is a silent threat that can halt your operations instantly: failing electrical wiring.

Because most of a commercial building’s electrical system is hidden behind walls or tucked into conduits, faults often go unnoticed until they cause expensive equipment downtime, or worse, an electrical fire.

Understanding how to spot the early warning signs of electrical failure can protect your team, save your stock, and keep your business compliant with South African safety standards. Here are five critical signs that your warehouse wiring needs urgent professional attention.

1. Persistent Flickering or Dimming Lights

If your high-bay warehouse lights flicker intermittently or dim when heavy machinery kicks in, it isn’t just an annoyance. This is usually a symptom of a voltage drop or a loose connection along the line. When large machinery starts up, it draws a massive amount of current; if your wiring cannot handle the load, the rest of the circuit suffers.

2. Strange Buzzing or Humming Sounds

A properly functioning electrical system should operate in complete silence. If you hear a faint buzzing, humming, or clicking coming from your Distribution Board (DB) or near wire ways, it is a major red flag. This noise is often caused by arcing—where electricity jumps across a gap in a damaged or loose wire—which generates extreme heat.

3. Mysterious “Fishy” or Burning Smells

Never ignore an unusual odor in the workplace. Damaged electrical insulation, overloaded wires, and overheating plastics emit a distinct, pungent smell that often resembles burning plastic or fish. If a specific section of your warehouse smells off, turn off the power to that zone immediately and call a certified electrician.

4. Wall Sockets or Switch Plates That Feel Warm

Electrical outlets and switch plates should never be warm to the touch. If you notice discoloration, scorch marks, or heat radiating from a socket, the internal wiring is likely overloaded or degraded.

5. Frequent and Repetitive Breaker Tripping

Circuit breakers are designed to trip to prevent disaster. If a specific breaker trips repeatedly, it is doing its job—warning you that the circuit is overloaded, or that there is a short circuit or ground fault. Constantly flipping the switch back on without investigating the root cause risks a catastrophic system failure.

The SANS 10142-1 Compliance Check

In South Africa, all workplace electrical installations must comply strictly with SANS 10142-1 (The Code of Practice for the Wiring of Premises).

Ignoring the warning signs listed above doesn’t just risk your operational workflow; it puts you in direct violation of the Occupational Health and Safety (OHS) Act. If a fire breaks out due to faulty wiring that you were aware of—or failed to maintain—corporate insurance policies can legally void your claim, leaving your business liable for millions in damages.

How PMT Can Help Secure Your Workplace

Don’t wait for a small electrical fault to turn into an operational crisis. At PMT, our qualified commercial electricians specialize in preventative maintenance, thermal imaging (which finds hidden hot spots before they burn), and comprehensive system faults diagnostics.

Is your warehouse showing any of these warning signs? Contact the PMT team today to schedule an electrical safety audit and ensure your facility remains fully compliant and safe.