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 ELECTRICAL
7.2.6 Fire alarm: Check condition of:
n
Pull stations:
n
Bells and horns:
n
Smoke/heat detectors:
n
Control panel:
Verify that the power is on. These are generally supplied by 120
volt AC power sources which are then transformed to 24 volt DC
within the panel
Verify that the battery backup is fully charged
Verify that there are no trouble lights on. If trouble lights are
illuminated, the panel or field devices need to be serviced
n Annunciator panel:
n Wiring:
7.2.7 Floors (Conductive Test):
n Specifications: Conductive floors may be made of lead, conductive rubber
or plastic, conductive masonry material, or conductive composition
material. Floors must comply with the following requirements:
The surface of the floor must be free from cracks and reasonably
smooth. If washing of floors is necessary, the material as installed
must be capable of withstanding repeated washing with hot water.
If conductive floors are to be waxed, a conductive wax approved by
Underwriters' Laboratories, Inc. shall be used
The material must not produce sparks when stroked briskly and
firmly with a hardened steel file
The material must not slough off, wrinkle, or buckle under normal
conditions of use
The electrical resistance measured between ground and a S-pound
electrode in direct contact with 5 square inches of floor area must
not exceed 1,000,000 ohms
In areas where conductive floors and conductive shoes are required,
the total resistance between the ground and the wearer shall not
exceed 1 megohm (1 million ohms). Where conductive floors and
conductive shoes are required, table tops on which exposed
explosives are handled or where explosive dust is encountered shall
be covered with properly grounded, conductive, sparkproof material
7-15
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