GAI-Tronics 700 Series Installationshandbuch - Seite 8
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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 plugging in a
live enclosure is not normal operation and can create arcs. To guarantee 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 at the time.
A separate power disconnect is highly recommenced. 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 Recommmendations
The ac input current for a 12-watt 700 Series Station (Handset/Speaker Amplifier or Speaker Amplifier)
is 0.46 amperes RMS at full power output (50 VA/27 watts) with 120 V ac line voltage. The 14 AWG
wire used for power distribution in standard GAI-Tronics cable is rated at 15 amperes. This limits the
number of speaker amp stations per ac feed to 32 units or less. System larger than 32 stations will require
breaking the ac power feed 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 90V ac and the resistance of 14 AWG cable is 26.8 ohms per loop mile.
Contact your nearest GAI-Tronics representative it you require assistance with system layout.
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