Installing the XW Automatic Generator Start
975-0307-01-01 2–5
Wiring to the 20-contact Connector
ELV Circuits ELV (Extra-Low Voltage) circuits have an open-circuit voltage of not
more than 30 V
rms
or 42.2 VDC or peak, and are therefore not a shock
hazard.
Class 2 Circuits As per the US National Electrical Code (NEC) and the Canadian
Electrical Code (CEC), available power in Class 2 circuits is limited to
100 VA, usually by current limiting by means of overcurrent protection or
series resistance. The current is limited to 5 A for circuits with open-
circuit voltage of 20 V, and to I=100/V
oc
for circuits with open circuit
voltage between 20 V and 30 V.
Circuit
Limitations
The relay contacts in the XW Auto Generator Start are rated at 5 A
maximum and all circuits on the 20-contact connector are rated at 30 V
maximum.
Ensure that all circuits connected to the 20-contact connector comply with
the following limits:
Wiring Harness Connections to the generator, thermostats, and external ON/OFF switches
are made using a wiring harness that plugs into the 20-contact connector
(see Figure 2-1).
CAUTION: Shock Hazard
All installation wiring should be performed by a qualified installer or electrician.
WARNING: Fire, Shock, and Energy Hazards
The 20-contact connector is intended for connection to Class 2 ELV (Extra Low
Voltage) circuits only. Do not exceed the circuit limitations specified in the
following section.
Table 2-1
Circuit Limitations
Circuit Parameter Circuit Maximum
Open circuit voltage (Voc) 30 V maximum
Overcurrent protection
(fuse size for open circuit voltage up to 20 V)
5 A maximum
Overcurrent protection
(fuse size for open circuit voltage from 20 V to 30 V)
5 A to 3.33 A
(100/V
oc
amps
maximum)
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