GAI-Tronics DHF-102 Digital Intercom Staitons - Manual (Page 11)

Pub.: 42004-383D
M ODEL DHS/DHF S ERIES D IGITAL I NTERCOM S TATIONS Page 9 of 24
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Field Wire Installation
1. Unfasten the front panel assembly.
2. Pull the field wiring through the conduit entrance in the rear of the enclosure. The use of ferrules is
recommended on the ends of stranded wire to create a secure, reliable connection.
3. Install all connections as indicated below. Refer to Figure 11 for wiring details. Refer to Table 1 and
Table 2 on page 11 for the recommended conductor sizes and lengths.
N OTE : USA and Canada Consult the National Electrical Code (NFPA 70), Canadian Standards
Association (CSA 22.1), and local codes for the specific requirements regarding your installation. Install
all equipment without modification and according to the local and national codes. Class 2 circuit wiring
must be performed in accordance with NEC 725.55.
Power
Central Power
This assembly is capable of operating without a 24 V ac or dc power source. When a 24 V dc power
source is not connected to P46, this station is powered by the central cabinet via the system cable. This
will limit the functionality of this station and limit the distance from the central cabinet. The following
functions will not be operational when central power is used:
• External speaker amplifier
• Audio line driver
• Headset operation
• Configurable outputs
The enclosure must be connected to earth ground. Install a ring lug on the ground conductor prior to
connection to the enclosure. Secure the ring lug to the #6 ground screw on the rear enclosure.
Local Power
This assembly requires a 24 V ac or dc power source for the station to be fully functional. The following
functions are enabled when central power is used:
• External speaker amplifier
• Audio line driver
• Headset operation
• Configurable outputs
A separate power feed is recommended for each intercom station. A pluggable terminal block P46 is
provided for connection of power to the station. Power leads can be connected to either L1 or L2 in ac or
dc systems. Also, the enclosure must be connected to earth ground. Install a ring lug on the ground
conductor prior to connection to the enclosure. Secure the ring lug to the #6 ground screw on the rear
enclosure.
Installation of this equipment shall be carried out by suitably-trained personnel in
accordance with the applicable code of practice concerning equipment and protective
systems intended for use in potentially Explosive Atmospheres.