Inadequate Wiring Hazards
Electrical wiring hazards occur when:
- Wire size is too small for the current it carries – this can cause the wire to overheat and potentially start a fire.
- Connections are improper or loose – this can create shock hazards or arcing.
How inadequate wiring creates risk:
- Circuit breakers are normally matched to the wire size. However, in older wiring, branch lines (e.g., to ceiling light fixtures) may use a smaller gauge than the main supply cable. Replacing a light fixture with a device that draws more current than the branch line can handle may exceed the wire’s ampacity, causing overheating and fire.
- Using undersized extension cords can create similar hazards. Even if the circuit breaker is properly rated, the smaller cord may overheat when powering high-current tools, posing a fire risk.
Special considerations for wiring materials:
- Aluminum wiring is more brittle than copper and can crack or break more easily.
- Loose or improperly made connections in aluminum wire can oxidize, producing heat or arcing hazards.
Key Takeaway: Always ensure wiring and connections are properly sized, installed, and maintained for the current they will carry, and pay attention to the type of conductor used.