3700 Series Flat Panel Industrial PC
Chapter 2 – Installation
33
143311 (H)
Power Switch
The 3700 series does not have a power switch. The amount of input power
required by this system classifies the power switch as an incendiary device
because the voltage and current across the make/break device are capable of
creating a spark.
Hazardous Locations' regulations require that a power switch rated for ordinary
locations may be used if it is located in an area specified as non-hazardous.
However, limits in cable length between the workstation and the power switch may
apply. Otherwise the switch must be compliant with Class I, Division 1
requirements (i.e. intrinsically safe). These switches are built in a manner that
prevents the possibility of a spark when contacts are made or broken.
Use suitable UL listed and/or CSA Certified Class I, Division 1 switches in
Hazardous Locations. These switches are available from a wide number of
sources. It is the responsibility of the customer to ensure that the power switch
selected for their installation has the correct Hazardous Locations rating for the
location in which it is installed.
Cable Connections
Division 2 Hazardous Location regulations require that all cable connections be
provided with adequate strain relief and positive interlock. Never connect or
disconnect a cable while power is applied at either end of the cable.
Communication Cable Interfaces
All communication cables should include a chassis ground shield. This shield
should include both copper braid and aluminum foil. The D-sub style connector
housing should be a metal conductive type (e.g., molded zinc) and the ground
shield braid should be well terminated directly to the connector housing. Do not
use a shield drain wire.
The outer diameter of the cable must be suited to the inner diameter of the cable
connector strain relief to ensure that a reliable degree of strain relief is maintained.
Always secure the D-sub connectors to the workstation mating connectors via the
two screws located on both sides.
Warning
Never connect or disconnect the communication cables while power is applied
at either end of the cable. This may result in an incendiary spark. Permanent
damage to the workstation communication components may occur.
Note
This warning does not apply to the front panel keyboard and USB interface
connectors. These connections are nonincendive circuits. Please refer to the
Hazardous Locations control drawing on page 34.
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