According to 46 CFR, Subchapter J...

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Question 1 of 205eccefa4bacbc34ba4d485b4

According to 46 CFR, Subchapter J (Electrical Engineering), in terms of conductor size, the capacity of each branch circuit providing power to a fire detection or alarm system must not be less than what percent of the maximum load?

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🔍 Key Concepts

• 46 CFR Subchapter J – Electrical Engineering requirements for vital systems like fire detection and alarm • Meaning of branch circuit ampacity relative to the maximum connected load • Typical safety factor used in marine electrical design for continuous or critical loads

💭 Think About

• Look up the exact wording in 46 CFR Subchapter J about branch circuits supplying fire detection or alarm systems—what percentage of the maximum load is required? • Ask yourself: for a critical safety system like fire detection, would regulations allow the circuit to be sized exactly at the load, below it, or require a safety margin above it? • Consider how electrical codes usually treat continuous or life‑safety loads—is there a common multiplier used to avoid overheating and nuisance trips?

✅ Before You Answer

• Verify you are in the correct part of 46 CFR Subchapter J that deals specifically with fire detection and alarm systems, not general lighting or power circuits. • Confirm whether the regulation talks about “not less than” a certain multiple of the maximum load (e.g., 1.0x, 1.25x, etc.). • Double‑check that the percentage applies to the branch circuit capacity (conductor and protective device), not to the device rating alone.

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