Federal Signal Global Serie Consignes D'installation Et De Maintenance page 18

Installation and Maintenance Instructions
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
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
Wiring the Ex de Models
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.
18
(12 AWG). The wire must be rated 85 °C or
2
Model G-SND Global Series Sounder