Page 8
1017-10
60706-144
The line terminals in the A.T.S. are marked “LINE - L1, L-
N, L3”. The “hot” leads L1 and L3 will wire directly to the
top lugs on the line side contactor. The L-N connection will
be made at the neutral bar on the standoffs on the floor of
the A.T.S.
The load terminals in the A.T.S. are marked “LOAD - T1,
T-N, T3”. The “hot” leads T1 and T3 will wire directly to the
load lugs between the contactors. s. The T-N connection
will be made at the neutral bar on the standoffs on the
floor of the A.T.S.
An equipment grounding lug is provided beside the neu-
tral bar for your use in grounding the transfer switch.
Three Phase
The standby generator terminals in the A.T.S. are
marked “GENERATOR - G1, G2, G3 and G-N. The “hot”
leads G1 G2 and G3 wire directly to the generator side
contactor, terminals G1, G2 and G3. The G-N connection
is made at the neutral bar on the standoffs on the floor of
the A.T.S.
The line terminals in the A.T.S. are marked “LINE - L1,
L2, L3 and L-N”. The “hot” leads L1, L2 and L3 will wire
directly to the top lugs on the line side contactor. The L-N
connection will be made at the neutral bar on the stand-
offs on the floor of the A.T.S.
The load terminals in the A.T.S. are marked “LOAD - T1,
T2, T3 and T-N”. The “hot” leads T1, T2 and T3 will wire
directly to the load lugs between the contactors. The T-N
connection will be made at the neutral bar on the stand-
offs on the floor of the A.T.S.
An equipment grounding lug is provided just above the T-
N connection for your use in grounding the transfer switch.
All the neutral leads (G-N, L-N and T-N) must be carried
through the A.T.S. These leads are all bonded together
within the A.T.S. and are bonded to GROUND at one com-
mon point. If your system requires an isolated neutral, this
neutral to ground bond can be isolated by removing the
copper strap located between the LINE terminal L-N and
the ground lug in the panel. This action, along with lifting
the Neutral to Ground bond in the generator connection
cabinet, will effectively change this unit to a fully isolated
neutral system.
The generator output leads in the generator connection
box follow the same marking pattern. i.e. G1, G-N and G3
on the single phase and G1, G2, G3 and G-N on the three
phase units.
*************
***** WARNING *****
*************
EQUUIPMENT DAMAGE - When installing a Three
Phase 240 volt system be sure you know which lead is the
high voltage "wild" leg (208Volt line to neutral). The gen-
erator normally carries the high voltage on the G3 lead.
INSTALLATION NOTES:
The load current carrying wires (L) and (T) must be sized
to handle the maximum load current without excessive
voltage drop. By code, the wire must be heavy enough to
handle the full current rating of the main line circuit-
breaker (or fuse) in the entrance (or sub-panel) protecting
the contactor switch.
A fused disconnect (circuit breaker or fuses) must be
installed between the engine generator and the A.T.S.
panel. See the generator specifications table on page 2
for disconnect sizing. Failure to install a proper fused dis-
connect will void any warranty on the generator end. All
wiring from the engine-generator to the transfer switch
must be of sufficient size to handle the appropriate fused
disconnect amperage.
All wires should be installed in rigid or flexible conduit.
(Knockouts are provided in the control box)
Because of the many different types of service, feeder,
and distribution equipment, no specific wiring instructions
can be provided. It is recommended that only copper wire
be used. In all cases it is essential that while the load is
connected to the generator, there can be absolutely no
feedback from the generator to the power line or the power
line to the generator. When properly installed, the normal
A.T.S. Control and safety systems will eliminate all paths
for feedback.
To wire the automatic transfer switch into the existing
wiring, first determine which circuits will be on the emer-
gency load circuit. If the entire load is to be transferred,
the transfer switch can be wired in directly after the service
entrance, providing the service entrance ampere rating is
within the transfer switch’s rated capability.
If only specific circuits are to be powered under emer-
gency power failure conditions, an additional distribution
panel designated “emergency distribution panel” must be
installed.
All selected emergency circuits are removed from main
distribution panels and reinstalled in the emergency distri-
bution panel. Suggested circuits: freezer, refrigerator, fur-
nace, emergency lights, sump pump, emergency outlet
circuits, etc. Total running load must not exceed genera-
tor rating.
