Transfer Switch Manual

Installation
Automatic Transfer Switch Owner’s Manual 7
Section 3 Installation
3.1 — Introduction to Installation
This equipment has been wired and tested at the factory.
Installing the switch includes the following procedures:
• Mounting the enclosure.
• Connecting power source and load leads.
• Connecting the generator start and sensing circuit.
• Connecting any auxiliary contact (if needed).
• Testing functions.
3.2 — Mounting
Mounting dimensions for the transfer switch enclosure
are in this manual. Enclosures are typically wall-
mounted. See the “Installation Diagram” section.
This transfer switch is mounted in a UL type 3R
enclosure. It can be mounted outside or inside and
should be based on the layout of installation,
convenience and proximity to the utility supply and load
center.
Install the transfer switch as close as possible to the
electrical loads that are to be connected to it. Mount the
switch vertically to a rigid supporting structure. To prevent
switch distortion, level all mounting points. If necessary,
use washers behind mounting holes to level the unit.
3.3 — Connecting Power Source and
Load Lines
Installation and interconnection diagrams are provided in
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 connection is made at the utility service
disconnect circuit breaker terminals. The generator and
customer load connections are made at the transfer
switch mechanism, inside the switch enclosure.
Conductor sizes must be adequate to handle the
maximum current to which they will be subjected, based
on the 75°C column of tables, charts, etc. used to size
conductors. The installation must comply fully with all
applicable codes, standards and regulations.
All power cables can enter the enclosure through the
knockouts provided. If not using the knockouts, conduit
entry into the enclosure above the level of uninsulated
live parts shall use fittings listed for use in wet locations
to maintain the Type 3R rating. Conduits should be
arranged to provide separation between the Utility and
Generator supply conductors inside the enclosure.
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
decal located on the inside of the door. After tightening
terminal lugs, carefully wipe away any excess corrosion
inhibitor.
Connect power source and load conductors to clearly
marked terminal lugs on transfer mechanism as follows:
1. Connect utility (normal) power source cables to
utility service disconnect circuit breaker if
equipped, or N1 and N2 lugs of the transfer switch.
See Figure 2-1.
2. Connect the generator (standby) source power
cables to transfer switch terminals E1, E2.
3. Connect customer LOAD leads to switch terminals
T1, T2.
3.4 — Connecting Start Circuit Wires
Control system interconnections may consist of N1, N2,
and T1, and leads 23 and 194. The generator control
wiring 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:
(000119)
Equipment malfunction. Installing a dirty or damaged
transfer switch will cause equipment malfunction and
will result in death or serious injury.
DANGER
(000116)
DANGER
Electrocution. Turn utility and emergency
power supplies to OFF before connecting power
source and load lines. Failure to do so will result
in death or serious injury.
(000120)
CAUTION
Equipment damage. Verify all conductors are tightened
to the factory specified torque value. Failure to do so
could result in damage to the switch base.