GE Multilin 350, Operation & Maintenance Manual

Page: 183 / 188

7
7.
OPERATING PROCEDURES
1. Identify the current rating of the Manual Ground
and Test Device by reading the nameplate on the
front or right side of the device. Make certain this
current rating matches the metal-clad unit into which
the device will be inserted.
2. Determine the compartment elevation (upper or
lower) and set the Selector Switch on the front of the
Manual Ground and Test Device: ”Upper” for upper
compartment and “Lower” for lower compartment.
3. Attach the three connection bars to the desired
extension bars (Bus or Line/Load). Use the bolts (4) Fig.
2, provided and tighten to 20-25 foot-pounds torque.
The three indicator rods should project beyond the
front cover on the studs to which the connection bars
are attached.
4. Adjust the front cover shutter (6) Fig. 1, to cover
the extension bars to which the connection bars are
not attached. This is accomplished by loosening the
shutter retaining screws (9) Fig. 1, on the backside of
the front cover and then tightening after the shutter
has been positioned. As a check after attaching the
extension bars per the next step, the shutter should be
positioned over the extension bar openings with the
recessed indicator rods.
5. WITHOUT any cable connections to the Manual
Ground and Test Device, rack the device into the
metal-clad
compartment. This should be
accomplished by using the Remote Racking Device.
6. Test the exposed studs to make certain that the
circuit is dead. This should be done using established
safety procedures.
7. Rack the Manual Ground and Test Device out to
the test position. Attach cables for making the
required connections between the ground angle and
the load/line studs. Grounding cables, lugs and
fasteners used are to be as follows:
Cable Specifications
Maximum Fault Current - 50kA rms (2 sec)
Cable
(2 per terminal) 500MCM, 259 Strands,TC
UL Style 3591
Lugs Burndy YA36N
Fasteners
½”-13bolts,Washers, Lock
Washers and Nuts (Grade 5)
CAUTION: Use the Cable Specification to ensure
satisfactorily withstand from the effect of a fault
current. Failure to adhere to the Cable Specification
may result in cables not capable of withstanding the
forces or heat generated by fault currents and cause
severe injury to nearby personnel.
Maximum cable length should be no more than 4 feet
for furthest terminal to Ground connection. All cables
should be sized to minimize length and bound
together to minimize movement in case of a fault
current.
8. Rack the Manual Ground and Test Device into
metal-clad equipment using the Remote Racking
Device. Follow the breaker installation and removal
procedure contained in instruction book GEK-39672.