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UL 698 1995 Edition, June 22, 1995
Complete Document
Superseded By: UL 1203
UL Standard for Safety Industrial Control Equipment for Use in Hazardous (Classified) Locations
Includes all amendments and changes through Revision Page(s) , March 15, 1999
Published By:UL (UL)
Page Count:81
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These requirements cover industrial control equipment for installation
and use in hazardous (classified) locations, Class I, Division 1, Groups
A, B, C, and D, and Class II, Division 1, Groups E, F, and G, in
accordance with the National Electrical Code, NFPA 70.

These requirements also cover explosion-proof electrical equipment for
installation and use in Class I, Zone 1, Groups IIA, IIB, IIB plus
Hydrogen, and IIC hazardous (classified) locations.

                        *1.1.1 added July 12,1996*

Examples of industrial control equipment are:

   a) Manual and magnetic starters and controllers.

   b) Thermal- and magnetic-overload relays.

   c) Pushbutton stations, including selector switches and pilot lights.

   d) Control-circuit switches and relays.

   e) Float-, flow-, pressure-, and vacuum-operated switches.

   f) Resistors and rheostats.

   g) Proximity switches.

   h) Time-delay relays and switches.

   i) Resistors and rheostats intended for industrial heating and
   lighting, including those for motor-generator fields.

   j) Control devices intended for industrial heating and lighting.

   k) Variable-voltage autotransformers.

These requirements apply to industrial control equipment for use in
hazardous locations under the following atmospheric conditions:

   a) A minimum ambient temperature of minus 25 degrees C (minus
   13 degrees F),

   b) An oxygen concentration not greater than 21 percent by volume, and

   c) A nominal barometric pressure of one atmosphere.

These requirements do not cover intrinsically-safe electrical circuits
of industrial control equipment for use in hazardous locations.

These requirements do not cover electrostatic devices, circuits, or
systems.

These requirements do not cover refrigeration-system controllers or the
internal construction of electrical instruments such as meters.

A product that contains features, characteristics, components,
materials, or systems new or different from those covered by the
requirements in this standard, and that involves a risk of fire,
electric shock, or injury to persons shall be evaluated using the
appropriate additional component and end-product requirements as
determined necessary to maintain the acceptable level of safety as
originally anticipated by the intent of this standard.  A product whose
features, characteristics, components, materials, or systems conflict
with specific requirements or provisions of this standard cannot be
judged to comply with this standard.  Where considered appropriate,
revision of requirements shall be proposed and adopted in conformance
with the methods employed for development, revision, and implementation
of this standard.