Underwriters Laboratories Inc. Standard for Safety UL508

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Industrial Control Equipment
1 Scope
1.1 These requirements cover industrial control devices, and devices accessory thereto, for starting,
stopping, regulating, controlling, or protecting electric motors. These requirements also cover industrial
control devices or systems that store or process information and are provided with an output motor control
function(s). This equipment is for use in ordinary locations in accordance with the National Electrical Code,
NFPA 70.
1.2 These requirements cover devices rated 1500 volts or less. Industrial control equipment covered by
these requirements is intended for use in an ambient temperature of 0 – 40°C (32 – 104°F) unless
specifically indicated for use in other conditions.
1.3 Deleted December 2, 2003
1.4 Examples of industrial control devices described in 1.1 are:
a) Manual, magnetic, and solid-state starters and controllers.
b) Thermal, magnetic, and solid-state 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) Solid-state time-delay relays.
l) Programmable controllers.
m) Numerical control systems.
n) Lighting dimmer systems and controls.
o) Mercury-tube switches.
p) Definite purpose controllers.
q) Solid-state logic controllers.


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