269
Maintenance of Flameproof
Installation and Operating
Maintenance of Flameproof Apparatus
To maintain the flameproof apparatus, do the following.
Maintenance
servicing with the
power on
Flameproof apparatus shall not be maintenance-serviced with
its power turned on. However, in cases where maintenance ser-
vicing is to be conducted with the power turned on, with the
equipment cover removed, always use a gas detector to check
that there is no explosive gas in that location. If it cannot be
checked whether an explosive gas is present or not, mainte-
nance servicing shall be limited to the following two items:
❑ Visual inspection - Visually inspect the flameproof
apparatus, metal conduits, and cables for damage or
corrosion, and other mechanical and structural defects.
❑ Zero and span adjustments - These adjustments should
be made only to the extent that they can be conducted
from the outside without opening the equipment cover. In
doing this, great care must be taken not to cause
mechanical sparks with tools.
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