GAI-Tronics Associated with 600-ohm systems Extended Range Page/Party System Manual - Manual (Page 8)

Pub. 42004-324A
Extended Range Page/Party
®
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Safe Power Connection/Disconnection
In order to satisfy Division 2 requirements, equipment must not create arcs or sparks during normal
operation, when completely installed and powered. Installing or removing an amplifier or connecting to a
live enclosure is not normal operation and can create arcs. To ensure personal safety, adhere to the
following cautionary note:
CAUTION
Do not insert or remove equipment from live enclosures, unless the area is known to be non-hazardous.
A separate power disconnect is highly recommended. It can be installed and safely used in either of two
ways:
1. An explosion-proof disconnect switch can be located in the Division 2 area.
2. An ordinary disconnect switch can be located in a non-hazardous area (outside the Division 2 area).
Either method will allow the use of the switch at all times. Connect field wiring as detailed in instructions
for the same equipment mounted in non-hazardous areas.
Power Distribution Recommendations
The ac power input current for a 700 Series Station (handset/speaker amplifier or speaker amplifier) is
0.46 amperes (50 VA or 27 watts) RMS at full power (12 watt RMS output) with 120 V ac line voltage.
The 14 AWG conductors used for power distribution in standard GAI-Tronics cable is rated at 15 amperes.
This limits the number of speaker amp stations per ac power feed to 32 units or less. Systems with more
than 32 stations will require splitting the ac power feeds into different branches.
Voltage drop must also be taken into consideration for long cable runs. The minimum operating voltage for
a GAI-Tronics station is 90 V ac, and resistance of 14 AWG cable is 26.8 ohms per loop mile. Thus,
length of the cable run must also be considered when designing and installing a system. Contact your
nearest GAI-Tronics representative if you require assistance with a system layout.