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2–6 975-0082-01-01
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.
The advantage of using Class 2 circuits for installing the Auto Gen Start is
that Class 2 circuits don’t have to follow the Class 1 wiring rules
(requiring the use of conduit and wiring boxes, et cetera) that apply
elsewhere in the applicable codes.
Circuit
limitations
The relay contacts in the Auto Gen 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 obey the
following limits:
WARNING: 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.
Open circuit voltage (V
oc
)
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)