Guardian Technologies 004988-4 Manual De Usuario

 10 

This prevents overloading the generator by keeping 
electrical loads below the wattage/amperage capacity 
of the generator. If the generator can only power criti-
cal loads, within it’s wattage/amperage capacity, dur-
ing utility power outages, use the emergency circuit 
isolation method.

Critical electrical loads are grouped together and 
wired into a separate “Emergency Distribution Panel.” 
Load circuits powered by that panel are within the 
wattage/amperage capacity of the generator set. The 
transfer switch must meet the following require-
ments:

• 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 dis-

tribution panel and the emergency distribution 
panel.

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 gen-
erator 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 equal 

the ampere rating of the normal incoming utility 
service.

• The transfer switch is installed between the util-

ity service entrance and the building distribution 
panel.

The National Electrical Code requires the frame and 
external electrically conductive parts of this equip-
ment to be properly connected to an approved earth 
ground and/or grounding rods. For that purpose, a 
GROUND LUG (Figure 2.2) is provided on the gen-
erator mounting base. Consult a qualified electrician 
for grounding requirements in the area. Grounding 
procedures must meet local regulations.

GROUNDING

LUG



Proper grounding helps protect personnel against 
electrical shock in the event of a ground fault condi-
tion in the generator or in connected electrical devic-
es. In addition, grounding helps dissipate static elec-
tricity that often builds up in ungrounded devices.

The manufacturer uses an UNGROUNDED AC neu-
tral. Grounding is recommended only at the main 
service entrance. If the neutral wire is grounded and 
one of the phase loads becomes grounded, the exces-
sive current opens the load circuit breaker or col-
lapses the generator field. The actual result depends 
on the electrical characteristics of the particular 
installed generator.



If the generator is to be installed with a pre-packaged 
(non-control board based) transfer switch, it is nec-
essary to connect the control wires to the generator 
and set position two of the four-position dip switch 
to OFF.

Setting switch two to OFF allows the control PCB to 
perform the ATS control functions.

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