According to 46 CFR, Subchapter J (Electrical Engineering), the capacity of a general emergency alarm system feeder fuse must be at least what ampere value?
• 46 CFR Subchapter J requirements for general emergency alarm systems • How feeder fuse capacity relates to the connected load current for protection and reliability • Differences between normal circuit protection sizing and emergency/essential system protection sizing
• Think about why an emergency alarm feeder fuse might need to be sized larger than the actual connected load current. • Consider what would happen during starting surges or simultaneous activation of multiple alarms on the circuit. • Ask yourself: does the regulation aim more to protect the wiring from overload, or to guarantee the alarm will operate under worst-case conditions?
• Look up the exact wording in 46 CFR Subchapter J under general emergency alarm system requirements. • Confirm whether the regulation states a percentage above the connected load current or an equal value. • Verify that you are looking at the requirement for the feeder fuse to the general emergency alarm system, not branch circuits or other protective devices.
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