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Installation
EMERGENCY CIRCUIT ISOLATION
METHOD
This prevents overloading the generator by keeping electrical
loads below the wattage/amperage capacity of the generator, If
the generator is powering only critical loads, within the wattage/
amperage capacity, during utility power outages, consider using
the emergency circuit isolation method,
Critical electrical loads are grouped together and wired into a sepa-
rate "Emergency Distribution Panel." Load circuits powered by that
panel are within the wattage/amperage capacity of the generator
set. When this method is used, it is difficult to overload the gen-
erator, The transfer switch must meet the
requirements:
• It must have an ampere rating equal to the total amperage rating
of the emergency distribution panel circuit.
• Have it installed between the building's main distribution panel
and the emergency distribution panel.
TOTAL CIRCUIT ISOLATION
METHOD
When a generator capable of powering all electrical loads in the
circuit is to be installed, use the "Total Circuit Isolation Method," It
is possible for the generator to be overloaded when this isolation
method is employed, The following apply to the transfer switch in
this type of system,
• Ampere rating of the transfer switch must
the ampere
rating of the normal incoming utility service,
• The transfer switch is installed between the utility service
entrance and the building distribution panel.
GROUNDING THE GENERATOR
The generator set must be grounded in accordance with the
National Electrical Code and any state or local requirements,
~
A
Do not connect the ground wire to any pipe
~that
carries a flammable or explosive sub-
stance - FIRE or an EXPLOSION may result.
Figure
2.2 -
Grounding Electrode Terminal (typical)
Base Frame
Grounding Electrode Terminal
14
GENERATOR AC NEUTRAL
CONNECTIONS
Grounding is recommended only at one point in the system,
Consult local building codes for proper neutral grounding require-
ments,
TRANSFER SWITCH START SIGNAL
CONNECTIONS
If the generator is to be installed with a standard automatic transfer
switch, such as a GTS type switch, it will be necessary to connect
the two-wire start control system,
Connect the two-wire start signal from the automatic transfer
switch to the automatic start connection, which is located in the
lower rear of the AC connection panel. Match wires 178 (0) and
183
In
the transfer SWitch to 178 (0) and 183 on the terminal strip
In
the connection box, The conductors for the two-wire start circuit
must be in their own conduit.
If the generator is to be installed with an HTS-type transfer switch
a different connection method is needed, Use shielded
2-wir~
communications cable (such a Belden #9460) to make the con-
nection from the HTS transfer switch to the engine generator
connection panel. This cable is to be routed in a separate conduit
between the HTS transfer switch and the generator, The cable is to
be connected as follows:
HTS transfer switch - 4 position terminal block, in the bottom of the
transfer switch enclosure (labeled "comm, Ports"),
Engine generator - terminal strip located in the lower rear of the
AC connection panel. Connect the RS485+ and RS485- to the
respective terminals in switch and generator. Do not connect the
shield at the transfer switch end.
BATTERY INSTALLATION
~
A
Stationary emergency generators installed
.... with automatic transfer switches will crank
and start automatically when NORMAL (UTIL-
ITY) source voltage is removed or is below
an acceptable preset level. To prevent such
automatic start-up and possible injury to per-
sonnel, do not connect battery cables until
certain that normal source voltage at the
transfer switch is correct and the system Is
ready to be placed Into operation.
A
Storage batteries give off explosive hydrogen
~gas.
This gas can form an explosive mixture
around the battery for several hours after
charging. The slightest spark can ignite the
gas and cause an explosion. Such an explo-
sion can shatter the battery and cause blind-
ness or other injury. Any area that houses a
storage battery must be properly ventilated.
Do not allow smoking, open flame, sparks or
any spark producing tools or equipment near
the battery.
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