Battery charging cabinets are increasingly used across mining operations to safely charge and store portable equipment batteries, including lithium battery systems. However, inspections and incident investigations have identified a potential electrical hazard associated with the internal cable management design of some cabinets.
In one incident, a worker received an electric shock while placing a device on charge inside a battery charging cabinet. The cabinet housed one power board, multiple chargers and several electrical leads, with some leads routed through an internal metal cable duct. Unprotected holes in the steel structure allowed the leads to pass through the metal trunking.
Investigators found that the edges of these openings were sharp and lacked mechanical edge protection. Over time, vibration and normal cable movement caused the PVC insulation on the electrical leads to rub against the sharp metal edges. This contact produced visible wear and marking on the cables—consistent with long-term abrasion—and created the potential for insulation damage and exposure of live conductors.
Damaged electrical cable insulation significantly increases the risk of electric shock if a worker handles or comes into contact with the affected lead during normal use. Similar cabinet designs are used across multiple mine sites, meaning the same hazard may exist at other operations if sites fail to identify and control the risk.
After identifying the hazard, the mine operator installed mechanical edge protection at the cable entry points of the battery charging cabinet to prevent further abrasion of the electrical leads.
Takeaways
- Inspect charging cabinets: Electrical teams should inspect battery charging cabinets and similar equipment for signs of cable damage, abrasion or degraded insulation.
- Identify sharp edge hazards: Review cable routing within cabinets and enclosures to ensure electrical leads do not contact sharp metal edges.
- Implement engineering controls: Install mechanical edge protection, grommets or protective conduit wherever cables pass through metal ducting or cabinet structures.
- Manage vibration-related wear: Consider the long-term effects of vibration and cable movement when assessing electrical installations.Address hazards proactively: Rectify design or installation issues that could damage insulation before they lead to electric shock incidents.
Summary
Battery charging cabinets are widely used across mining operations, but poor cable routing and inadequate edge protection can introduce hidden electrical hazards. Sharp metal edges can gradually damage cable insulation, increasing the risk of electric shock during normal equipment use. Regular inspections and simple engineering controls—such as installing mechanical edge protection—can effectively eliminate this risk and help prevent future incidents.
