Howard HI-104 Single-Phase Pad Transformer User Manual
Page 34
Document 2.4.96, Revision 0
March, 2013
34
Single-Phase Pad-Mounted Compartmental-Type Distribution Transformers
Table 4: Torque Guidelines for Accessories
Component
Nominal
Torque
(in-lbs)
Torque
Range
Bay-O-Net fuse cartridge
end plug
70
60-80
Bay-O-Net fuse holder-to-
cartridge connection
70
60-80
Bushing-mounted weak-
link fuse mounting bolts
150
140-160
Dry-well fuse canister
clamp
60
40-80
Fluid-level sight plug
600
480-720
Fill plug
960
900-1020
Drain plug
960
900-1020
Drain valve
600
480-720
Automatic pressure relief
valve, 1/4” NPT
180
160-200
Automatic pressure relief
valve, 1/2” NPT
180
170-190
Neutral strap fastener (at
ground pad)
160
140-180
Series/multiple, delta/wye
or tap switch mounting nut
120
96-144
MOV arrester disconnector
nut (ECI brand)
120
96-144
Ground connector
160
140-180
Rotary load-break switch
mount (Central Moloney
brand)
1200
1100-
1300
Rotary load-break switch
mount (Cooper Power
brand)
600
480-720
Rotary load-break switch
handle, Allen screw
55
45-65
When checking tightness of gasketed components, the measured
torque will normally be less than the nominal torque listed in the table
above due to relaxation of the gasket material. Additional tightening of
bushing mounting hardware may cause the component to crack or the
gasket to become over-compressed.
Additional Maintenance Instructions
Features and accessory devices discussed herein
may not be present in all transformers. Some fea-
tures or accessory devices may be present on a
transformer, but not discussed in these instructions.
Howard Industries does not represent that these
instructions are complete, sufficient, accurate or use-
ful for all circumstances.
Questions regarding installation, operation, and
maintenance should be directed to the Howard
Industries Transformer Division, particularly when
encountering unusual or special circumstances not
sufficiently covered by these instructions.
Repair Parts
Repair parts can be ordered from the Howard Indus-
tries Transformer Division. A description of the part
and the transformer serial number will be required to
ensure that the correct part has been ordered.
Warranty Claims
The Howard Industries Transformer Division should
be notified immediately when problems are discov-
ered during the warranty period. All warranty repairs
must be made or approved by the Howard Industries
Transformer Division.