7
REV A
OPM-136
ELECTRICAL CONNECTIONS
GROUNDING
Proper grounding of your generator is application dependent. Carefully
evaluate your planned use of your generator to understand which
grounding you require. If you are not sure what to do, contact a
competent professional to assist you. The NFPA 70 250:34-35 are good
technical references.
STANDARD PORTABLE GENERATOR
Your WINCO portable generator ships with a bonded neutral. You can
safely use this generator without external grounding as long as all
loads are powered through the receptacle panel.
VEHICLE-MOUNTED GENERATOR
Your WINCO portable generator ships with a bonded neutral. When
mounted to a vehicle to safely distribute power it is necessary that
the generator frame is bonded to the vehicle frame. The generator
should only supply equipment that is cord and plug connected through
receptacles mounted on the generator or the vehicle.
PERMANENTLY INSTALLED GENERATORS
This WINCO portable generator ships with a bonded neutral and
overcurrent protection. NFPA 70 refers to this as a “separately derived
system.” When connecting it to a building a transfer switch specifically
designed for GFCI and bonded neutral generators is required.
CAUTION:
Only qualified electricians should install electrical wiring. Wiring must
conform to all applicable national, state, and local codes. (Reference:
National Fire Protection Association Manual No. 70, National Electrical
Code.)
DANGER: PERSONAL INJURY:
A manual transfer switch must be installed to separate the generator
and the commercial power lines. The switch must isolate the generator
from the commercial power lines and the load when the generator is
on standby, and must isolate the commercial power lines from the load
and the generator when the generator is supplying power. See the
following diagrams.
A properly rated and installed double throw manual power isolation
transfer switch must be used with a standby generator. The transfer
switch isolates the load from the power line and allows you to safely
operate your loads without endangering the power line repair crew. See
diagram on page 8.
The load, connected to the normal terminals of the transfer switch, is
energized by the normal power line when the switch is in the normal
position. The generator, connected to the emergency terminals of the
switch, furnishes power when the switch is in the emergency mode
position.
There are two ways to install a manual transfer switch. The first
shown on the left side of the diagram on page 8, is to install the switch
between the watt-hour meter and the normal distribution panel. As
with any system you must install an entrance rated breaker before the
manual transfer switch. The manual transfer switch must in all cases be
equal to or greater than the rating of the entrance rated breaker.
The second way to install the system is to purchase and install an
emergency distribution panel and move the circuits you wish to back
up to the new distribution panel. In this case the manual transfer switch
only has to be sized to the amperage of the circuit breaker in the main
distribution panel that is feeding it. See the right hand drawing of the
diagram on page 8.
Before deciding which system to install, first determine which loads you
can safely run on your PTO generator and the cost of buying a large
manual transfer switch versus the cost of a smaller switch and the
additional distribution panel.
PLUG KIT
The bag contains an instruction sheet, 2 plug bodies, four contacts,
two handle and the hardware to assembly the disconnect plug. You will
need to purchase the appropriate length of fine stranded copper wire
for your application in order to complete the assembly of the disconnect
plug. Your application and local code will determine the type of wire
used. WINCO’s recommended wire size is given in each plug kit.
Single Phase
120/240V
Three Phase
120/208V & 120/240V
Three Phase
277/480V
