The current carried continuously in bare copper bars in auxiliary gutters shall not exceed how many amperes per square inch?

The correct answer is based on the standard practices for electrical installations, specifically regarding the current-carrying capacity of bare copper conductors. When it comes to bare copper bars used in auxiliary gutters, the code stipulates that the maximum allowable current is 1250 amperes per square inch. This limit helps ensure that the conductors operate within safe temperatures, preventing overheating and potential damage.

This specification is derived from considerations of conductivity, heat dissipation, and the risk of fire or failure due to excessive current density. Bare copper offers excellent conductivity, but it is crucial to manage the current effectively to maintain safety and system reliability. Understanding these standards is vital for anyone working in electrical contracting to ensure compliance with code regulations and to uphold safety in electrical installations.