21
Installation and Maintenance Instructions
Model G-SND Global Series Sounder
Preparing to Wire the Ex de Increased Safety Models
SHOCK HAZARD: To avoid electrical shock hazards, do not
connect wires when power is applied. Failure to observe this
warning may lead to serious injury or death.
This section has wiring instructions for the three increased safety models:
• G-SND 24 Vdc
• G-SND 120 Vac
• G-SND 240 Vac
Ex de units are supplied with a six-pole, spring-tension clamp style
terminal block. The maximum wire gauge is 4.0 mm
2
(12 AWG).
The wire must be rated 85 °C or higher.
Use only stranded cable to
terminate the sounder. The cross-sectional area of the primary earth
(ground) must equal the cross-sectional area of the phase conductor.
Cable termination should be in accordance with specifications
applying to the application. It is recommended that all cables and
cores should be fully identified. Use the appropriate cable gland for
the application. Gland entry threads are M20-1.5 6H.
Conductive metalwork, including cable glands, must be a
minimum of 5 mm away from the terminals.
Leads connected to the terminals shall be insulated for the
appropriate voltage and this insulation shall extend to within
1 mm of the metal of the terminal throat.
The G-SND terminal block is supplied with two conductors per
pole. The terminal block allows for easy supply-in and loop-out
wiring to connect sounders in series.
Tools needed:
• 3.0 mm A/F hexagon key
• No. 1 Phillips screwdriver
• Wire stripper
