Is it true that the service entrance terminals must always be labeled when using aluminum wire?

Labeling service entrance terminals when using aluminum wire is important for several reasons. Aluminum wiring has different characteristics compared to copper wiring; it expands and contracts more with changes in temperature which can lead to potential issues if connections are not maintained properly. Labeling helps in identifying the wiring type and ensures that anyone working on the electrical system is aware of the appropriate procedures associated with aluminum wire.

Furthermore, code requirements often mandate that all components of an electrical system are properly labeled to enhance safety and clarity. This is especially crucial for electrical systems where aluminum wire is involved, as workers need to take specific precautions to avoid risks such as overheating or connection failures. Proper labeling also aids emergency responders in understanding the system they may be dealing with in case of an emergency.

While the option suggesting only safety reasons reflects an aspect of the rationale behind labeling, it does not encompass the comprehensive approach to compliance and operational safety. The framework of jurisdictional requirements reinforces that labeling is not merely optional but a necessary practice for proper safety and system identification.