UL 508:1999 pdf download Industrial Control Equipment
1 Scope
1.1 These requirements cover industrial control devices, and devices accessory thereto, for startingstopping, regulating, controlling, or protecting electric motors. These requirements also cover industriacontrol devices or systems that store or process information and are provided with an output motor controlfunction(s). This equipment is for use in ordinary locations in accordance with the National Electrical Code.NFPA 70.
1.2 These reauirements cover devices rated 1500 volts or less. industrial control eauipment covered bithese requirements is intended for use in an ambient temperature of 0 – 40°C (32 – 104°F) unlessspecifically 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 motorgenerator fields.
j) Control devices intended for industrial heating and lighting.
k) Solid-state time-delay relays
I)Programmable controllers.
m)Numerical control systems.
n) Lighting dimmer systems and controls.
o) Mercury-tube switches.
p) Definite purpose controllers
Solid-state logic controllers.g1
r)Industrial microprocessor/computer systems.
s) Variable voltage autotransformer.
t)Motor starting autotransformer.
1.5 Industrial control panels are covered by the requirements in the Standard for Industrial ControlPanels,UL 508A.
1.5 revised December 2, 2003
1.6Fire pump controllers are covered by the requirements in the Standard for Fire Pump Controllers, UL218.
1.6 revised December 2, 2003
1.7 An adjustable-speed drive and accessories or modules for use with an adjustable-speed drive arecovered by the Standard for Power Conversion Equipment, UL 508C.
1.8 Equipment intended for use in hazardous locations as defined by the National Electrical Code, NFPA70, are covered by the Standard for Explosion-Proof and Dust-lgnition-Proof Electrical Equipment for Use
in Hazardous(Classified) Locations,UL 1203.
1.8 revised October 16, 2013
1.9 Devices that regulate temperature and/or control refrigeration equipment are covered by the Standardfor Temperature-lndicating and -Regulating EquipmentUL 873, and other applicable standardsCompliance with the Standard for Automatic Electrical Controls for Household and Similar Use, Part 1:General Requirements, UL 60730-1, and/or the applicable Part 2 standard from the UL 60730 seriesfulfills these requirements.
1.9 revised October 16,20131.10 Electrical instruments are covered by the Standard for Electrical Analog lnstruments- Panel BoardTypes,UL 1437.
1.11 A product that contains features, characteristics, components, materials, or systems new or differenttrom those covered by the requirements in this standard, and that involves a risk of fire or of electric shockor injury to persons shal be evaluated using appropriate additional component and end-productrequirements to maintain the level of safety as originally anticipated by the intent of this standard.Aproduct whose features,characteristics, components,materials,or systems conflict with specificrequirements or provisions of this standard does not comply with this standard. Revision of requirementsshall be proposed and adopted in contormance with the methods employed for development, revision, andimplementation of this standard.
1.11 revised August 22,2000
UL 508:1999 pdf download
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