14
Installation and Maintenance Instructions
Model G-SND Global Series Sounder
Preparing to Wire the Ex d Flameproof 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.
CIRCUIT BOARD DAMAGE: The DC sounders are polarity
sensitive, and MAY BE DAMAGED by incorrect electrical hookup.
When connecting the DC sounder to the voltage supply lines,
POLARITY MUST BE OBSERVED. In addition, damage will result
if the voltage rating of the particular model is exceeded by more
than 10 percent.
This section has wiring instructions for the flameproof models
G-SND 24 Vdc, 120 Vac, 220-240 Vac.
Ex d units are supplied with an eleven-position PCB mounted screw
terminal block. The maximum wire gauge is 4 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 for these models 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 x 6H.
Tools needed:
• 1.5 mm A/F hexagon key
• 2 mm flat-tip screwdriver
• No. 1 Phillips screwdriver
• Wire stripper