What is the maximum current allowed in bare copper bars within auxiliary gutters?

The maximum current allowed in bare copper bars within auxiliary gutters is defined by the National Electrical Code (NEC) and relevant electrical standards, which stipulate that bare copper conductors can safely carry a significant amount of current based on their size and cooling conditions.

Selecting 1000 amperes per square inch reflects accepted standards for current-carrying capacity for bare copper conductors in situations where they are exposed to air, allowing for effective heat dissipation. This rating considers factors such as resistance, ambient temperature, and installation conditions that impact the current-carrying capabilities of copper conductors.

In contrast, the other values listed do not adequately correspond to the established limits for the current capacity of bare copper bars. Lower values would create a scenario where the conductor may be undervalued and, therefore, lead to potential overheating and safety hazards. Hence, the standard maximum current rating of 1000 amperes per square inch is essential for ensuring safe and efficient operation of electrical systems using bare copper within auxiliary gutters.