Publication 1764-UM001B-EN-P - April 2002
2-4 Installing Your Controller
Use only the following communication cables in Class I, Division 2
hazardous locations.
Disconnecting Main Power
The main power disconnect switch should be located where operators
and maintenance personnel have quick and easy access to it. In
addition to disconnecting electrical power, all other sources of power
(pneumatic and hydraulic) should be de-energized before working on
a machine or process controlled by a controller.
Safety Circuits
Circuits installed on the machine for safety reasons, like overtravel
limit switches, stop push buttons, and interlocks, should always be
hard-wired directly to the master control relay. These devices must be
wired in series so that when any one device opens, the master control
relay is de-energized, thereby removing power to the machine. Never
alter these circuits to defeat their function. Serious injury or machine
damage could result.
Table 2.1 Cables for Use in Class I, Division 2 Hazardous Environment
1761-CBL-PM02 Series C or later 2707-NC8 Series B or later
1761-CBL-HM02 Series C or later 2707-NC9 Series B or later
1761-CBL-AM00 Series C or later 2707-NC10 Series B or later
1761-CBL-AP00 Series C or later 2707-NC11 Series B or later
WARNING
!
EXPLOSION HAZARD
Do not replace components or disconnect
equipment unless power has been switched off.
WARNING
!
EXPLOSION HAZARD
Do not connect or disconnect connectors while
circuit is live.
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