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Installation
6 Automatic Transfer Switch Owner’s Manual
3.3 — Routing the Flexible Conduit
1.
Determine where the flexible conduit will pass
through the building from inside to outside.
2.
While adhering to all local electrical codes, route
the 30 foot conduit along ceiling/floor joists and
wall studs to the location where the conduit will
pass through the wall to the exterior of the building.
NOTE: The 30 foot whip can be shortened to any length
or lengthened up to 70 additional feet. It can also be
removed and replaced with field wiring.
NOTE: The two foot pre-wire whip can be shortened if
needed or removed and replaced with field wiring. The
factory installed branch circuits and circuit breakers can
also be modified if needed. Follow all applicable electrical
codes for any field modification.
IMPORTANT: Follow all applicable NEC codes for the
installed wiring methods.
3.
From inside the building, feed the end of the 30-
foot conduit (INCLUDED and pre-wired from trans-
fer switch) through the wall to the outside.
4.
Remove the threaded lock nut from the conduit
connector.
3.4 — Connecting Power Source and
Load Lines
Installation and interconnection diagrams are provided in
the
Drawings and Diagrams
section of this manual.
NOTE: All installations must comply with national, state
and local codes. It is the responsibility of the installer to
perform an installation that will pass the final electrical
inspection.
The utility supply, generator, and customer load connec-
tions are made at the transfer switch mechanism, inside
the switch enclosure.
Conductor sizes must be adequate to handle the maxi-
mum current to which they will be subjected, based on
the 75°C column of tables, charts, etc. used to size con-
ductors. The installation must comply fully with all appli-
cable codes, standards and regulations.
NOTE: If aluminum conductors are used, apply corrosion
inhibitor to conductors. After tightening terminal lugs,
carefully wipe away any excess corrosion inhibitor.
Tighten terminal lugs to the torque values as noted on the
inside of the door.
Connect power source and load conductors to clearly
marked terminal lugs on transfer mechanism as follows:
1.
Install a 2-pole, 50 Amp breaker for 8kW units and
a 70 Amp double-pole breaker for 11-16kW units,
in the home’s main distribution panel. This will be
the utility (normal) power source for transfer switch.
2.
Customer LOAD leads are pre-wired at the factory.
NOTE: Conductors must be properly supported, of
approved insulative qualities, protected by approved con-
duit, and of the correct wire gauge size in accordance
with applicable codes.
3.5 — Connecting Generator Control
Wiring
Control system interconnections may consist of N1, N2,
and T1, and leads 23 and 194. The generator control wir-
ing is a Class 1 signaling circuit. Reference instruction
manual of specific engine generator for wiring connection
details. Recommended wire gauge sizes for this wiring
depends on the length of the wire, as recommended in
the following chart:
Exception: Conductors of AC and DC circuits, rated
1000 volts nominal, or less, shall be permitted to occupy
the same equipment, cable, or conduit. All conductors
shall have an insulation rating equal to at least the maxi-
mum circuit voltage applied to any conductor within the
equipment, cable, or conduit. See NEC 300.3(C)(1).
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Maximum Wire Length Recommended Wire Size
1-115 ft (1-35m) No. 18 AWG.
116-185 ft (36-56m) No. 16 AWG.
186-295 ft (57-89m) No. 14 AWG.
296-460 ft (90-140m) No. 12 AWG.
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