Questions: What condition causes aluminum branch circuit wiring to be unsafe? overheating at poor connections the absence of ground wires the use of COPALUM crimp connectors wire gauges too small for amperage

The answer is the first one: overheating at poor connections.

Explanation for each option:

1. Overheating at poor connections: This is correct. Aluminum wiring can expand and contract more than copper wiring, which can lead to loose connections over time. These loose connections can cause overheating, which is a significant fire hazard.

2. The absence of ground wires: While the absence of ground wires is a safety concern, it is not specific to aluminum wiring. This issue can occur with any type of wiring and is not the primary reason aluminum wiring is considered unsafe.

3. The use of COPALUM crimp connectors: This is incorrect. COPALUM crimp connectors are actually a recommended solution to make aluminum wiring safer. They provide a secure connection that reduces the risk of overheating.

4. Wire gauges too small for amperage: This is also incorrect. Using wire gauges that are too small for the amperage is a general electrical safety issue and not specific to aluminum wiring. It can cause overheating in any type of wiring, not just aluminum.

Summary: The primary condition that causes aluminum branch circuit wiring to be unsafe is overheating at poor connections. This is due to the tendency of aluminum to expand and contract, leading to loose connections and potential fire hazards.