11
TIT3IM /
January 2019
The ground connection should also be checked to ensure
a low impedance connection.
The door fit and gasket condition should be checked for a
proper fit and seal.
Transformers that have been exposed to flood conditions,
may not be able to be dried out appropriately. The insulation
resistance, primary to core, secondary to core and primary to
secondary, should be greater than 1kV MEGOHMS. Contact the
transformer manufacturer for appropriate action instructions.
Dry-Out of Transformers
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION OR
ARC FLASH
Failure to follow the attached dry-out procedures
before energizing transformers previously exposed
to moisture will result in serious personal injury or
death and property damage.
RECOMMENDED TORQUE VALUES FOR BOLTED
ELECTRICAL CONNECTIONS
BOLT SIZE
CARBON ST.
GRADE 5
ft-lbs [Nm] ±5%
BRASS
ALLOY CU270
ft-lbs [Nm] ±5%
S.S STEEL
B8 OR B8M
ft-lbs [Nm] ±5%
1/4-20
7 [10]
3.8 [5]
5 [6]
3/8-16
20 [27]
14 [18]
15 [20]
1/2-13
60 [70]
33 [45]
37 [50]
8 mm
20 [23]
12 [14]
12 [14]
12 mm
60 [70]
33 [45]
37 [50]
*Note: The above torque values are for dry, unlubricated bolts.
Failure to follow storage requirements can result
in death or serious injury, and property damage.
WARNING