Two sources of electrical energy shall be provided for direct wire fire alarm signal systems. Which of the following statements is accurate?
A. The primary source shall be storage battery power, and the secondary source shall be generated electric power supplied by utility company power or isolated plants.
B. The primary source shall be adequate emergency power, and the secondary source shall be storage battery power.
C. The primary source shall be generated electric power supplied by utility company power or isolated plants, and the secondary source shall be energy diverted from an adjacent building.
D. The primary source shall be generated electric power supplied by utility company power or isolated plants, and the secondary source shall be adequate emergency power if available or storage battery power.
Answer: D. The primary source shall be generated electric power supplied by utility company power or isolated plants, and the secondary source shall be adequate emergency power if available or storage battery power.
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