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Safety Messages for Wiring
When installing and operating flameproof electrical equipment, the relevant national regulations for installation and
operation (e.g., EN60079-14, IEC Wiring Regulations and NEC/CEC) must be observed.
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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.
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To maintain the flameproof integrity of the enclosure, DO NOT damage the cover or threads while disassembling or
reassembling the unit.
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Painting and surface finishes, other than those applied by Federal Signal Corporation, are not permitted.
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Cable termination should be in accordance with specifications applying to the application. Federal Signal
recommends that all cables and cores be fully identified.
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Ensure that only the correct equipment-certified glands are used and that the assembly is shrouded and correctly
earthed. Gland entries are M20-1.5 6H with an option for the M25 entry on the end of the increased safety box
models. See Table 4 on page 13 for choosing the correct cable entry devices for Equipment in Potentially
Explosive Atmospheres.
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Because of space limitations, ensure that the cable cores within the unit are not too slack.
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In all countries, the wiring must comply with all national and local codes and standards.
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Ensure that all nuts, bolts, and fixings are secure.
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
(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 be fully identified. Use the appropriate cable gland for the application. Gland
entry threads are M20-1.5 x 6H.
Tools needed:
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1.5 mm A/F hexagon key
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2 mm flat-tip screwdriver
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No. 1 Phillips screwdriver
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Wire stripper
Federal Signal signaling.fedsig.com
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