Powell Power/Vac - Abnormal Conditions; Doors

Powered by Safety
®
62
Maintenance
Power/Vac® Metal-Clad Switchgear 5kV & 15kV
01.4IB.67000
c. The resistance of bus connections may
be checked by passing a measured
DC current of 200A or more, through
the joint and measuring the voltage
drop (in millivolts) across the joint. An
increase in the voltage drop indicates a
joint requiring maintenance.
d. Tests on circuit breakers, removable
elements, and other devices which
are included in the switchgear should
be performed in accordance with the
instructions applicable to each device.
14) Abnormal Conditions
Local atmospheric conditions such as high
humidity, salty atmosphere, corrosive
gases, heavy dust, extreme heat, or severe
operating conditions, are considered to be
abnormal, and more frequent equipment
inspections are required.
A series of quarterly inspections should be
performed to analyze the effect of local
abnormal conditions on equipment. Then
an inspection and maintenance schedule
can be established to maintain the
equipment in a satisfactory condition.
If maintenance and inspection frequency
in abnormal conditions interferes with
operating and production schedules,
consideration should be given to placing
the equipment in a relatively tight room.
Clean air can be pumped into the room to
create positive air pressure and decrease
exposure of the equipment to abnormal
conditions. In areas where the ambient
temperature is relatively high, cooling the
air will improve equipment protection from
extreme heat conditions. A less frequent
maintenance schedule can be established
when equipment is protected from
abnormal conditions.
15) Doors
Verify that all doors open without
interference.
a. Exterior doors utilizing tie-down bolts
should have gasket material around
the tie-down bolt holes. Confirm
the presence and functionality of
the gasket. If the gasket is damaged,
replace it.