Pro-face PS-4000B Series, User Manual

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Important Information
23
Power Switch
The amount of input power required by systems with a PS-B unit classifies the power
switch as an incendive device because the voltage and current across the
make/break component are capable of generating a spark.
If using an ordinary power switch, hazardous location regulations require the power
switch be 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
(intrinsically safe). These switches are built in a manner that prevents the possibility
of a spark when contact is 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 to ensure you select a power switch that conforms to the hazardous
location rating for the installation.
Cable Connections
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION OR ARC FLASH

Remove all power from the device before removing any covers or elements of
the system, and prior to installing or removing any accessories, hardware, or
cables.

Unplug the power cable from both the PS-B unit and the power supply.

Always use a properly rated voltage sensing device to confirm power is off.

Replace and secure all covers or elements of the system before applying power
to the unit.

Use only 24 Vdc when operating the PS-B unit.
Failure to follow these instructions will result in death or serious injury.
DANGER
EXPLOSION HAZARD

Always confirm the ANSI/ISA 12.12.01 and CSA C22.2 N

213 hazardous
location rating of your device before installing or using it in a hazardous location.

To power on or power off a PS-B unit installed in a Class I, Division 2 hazardous
location, you must either:

Use a switch located outside the hazardous environment, or

Use a switch certified for Class I, Division 1 operation inside the hazardous
area.

Do not disconnect equipment unless power has been switched off or the area
is known to be non-hazardous. This applies to all connections including power,
ground, serial, parallel, and network connections.

Never use unshielded / ungrounded cables in hazardous locations.

Use only non-incendive USB configuration.

When enclosed, keep enclosure doors and openings closed at all times to avoid
the accumulation of foreign matter inside the workstation.
Failure to follow these instructions will result in death or serious injury.