Wiring to the 20-contact connector, Wiring to the 20-contact connector –6, Warning: shock hazard – Xantrex Technology Automatic Generator User Manual

Page 28: Warning: fire, shock, and energy hazards

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Installation

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)

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