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 ELECTRICAL
Floors (Conductive Test)-Continued
n Testing: Ensure that conductive floors were tested at the time of
installation and thereafter at least semi-annually. The tests shall
determine if the floors meet the requirements above. The results of these
tests should be posted in preventive maintenance records or a log and
maintained on file:
n Type of Instrument: Instruments used in testing floors should be of a type
specifically designed for this purpose. It is recommended that the voltage
applied by the testing instrument be between 90 and 500 volts. Tests may
be conducted with low voltage instruments, but if the floors show more
than the maximum resistance by tests with instruments of less than 500
volts, a test with a 500-volt instrument should be made to confirm the
results. The instrument used should consist of two dry electrodes, one of
which should be a piece of metal which weighs 5 pounds and makes
contact with 5 square inches of floor area. The other electrode should
consist of a spring clip for attachment to a permanent ground:
n Use of instrument: Instruments for testing the conductivity of floors
shall be used inside the room only if the room is free of explosives;
otherwise, the test instrument shall be placed outside the room. In any
case, the floor in the immediate area of electrode contact shall be
thoroughly cleaned of all explosive material:
7.2.8 Fresh Water Storage (Cathodic Protection System): See paragraph 7.2.1
for the cathodic protection requirements of fresh water storage. For water tank struc-
ture inspection check for:
GALVANIC OR SACRIFICIAL ANODE SYSTEMS:
n Terminals and Jumpers of Test Leads (permanently installed and
accessible on underground systems):
rust
corrosion
broken or frayed wires
loose connections
similar deficiencies. Tighten connections
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