INSTALLATION
(continued)
Series 911
2
381333–241
Be sure that the insulator piece is behind
the 260 and 400 ampere RC Switches.
insulator
backing
piece
Figure 2. Required insulator backing piece
for 260 and 400 amp. RC Switches.
Mount the RC Switch vertically in the back of the
enclosure as shown on the
Composite Outline
drawings
provided. Level all mounting points of the rigid
supporting structure by using flat washers behind the
holes to avoid forced distortion of the transfer switch.
Power connections
Use
Wiring Diagram
355634 furnished at the back of this
manual for 100–400 amp RC Switches. Use
Wiring
Diagram
724242 furnished at the back of this manual for
600–1200 amp RC Switches. All wiring must be made in
accordance with the local codes. Table A shows the range
of conductor sizes and number of conductors accepted by
RC Switch terminals and the corresponding tightening
torque recommended.
De–energize the conductors before making
any power or control circuitry connections.
Be sure that the load L1, load L2, and Line
connections are in the same phase sequence.
It is unnecessary to remove the barriers from the RC
Switches. H–design 600–1200 amp size RC Switches have
interphase barriers that have cutouts to access cable
terminals. These interphase barriers should not be
removed. Always protect internal components from
damage and metal chips and construction debris. Do not
run cables behind the RC Switch. Conductors can be
bundled on the right side of the switch. Maintain proper
electrical clearance between live metal parts and
grounded metal: ½ inch minimum up to 400 amps., 1
inch minimum over 400 amps..
Connect main source and load conductors to clearly
marked power terminals on the RC Switch. Be careful
when stripping insulation from conductors; avoid nicking
or ringing the conductor. Remove surface oxides from
conductors by cleaning with a wire brush. Follow
conductor manufacturer’s instructions when aluminum
conductor is used. Apply joint compound to conductor,
then carefully wipe away excess compound. Tighten the
terminals to the torque specified in Table A.
Table A. Transfer switch terminals for power conductors (use stranded–type conductors).
RC Switch
Rating (amps)
Maximum Number of
Conductors per Terminal
Range of Conductor Sizes
Al–Cu AWG
Recommended
Tightening Torque
#14 to #10
35 in–lb
100
one
#8
40 in–lb
100
one
#6 to #4
45 in–lb
#3 to 1/0
50 in–lb
150, 200, 225
one
#6 to 350 MCM
375 in–lb
260 400
two
#1/0 to 250 MCM
600 in lb
260, 400
one
#4 to 600 MCM
600 in–lb
600, 800, 1000
two
#1 to 600 MCM
375 in lb
1200
four
#1 to 600 MCM
375 in–lb