UL XAPX - Future Design Controls

Temperature-indicating and Regulating Equipment
Guide Information for Electrical Equipment for Use in Ordinary Locations
This category covers electrical controls designed for heating and cooling equipment, room temperature
or humidity regulation, and industrial uses. They are intended for household, commercial or industrial use
in accordance with ANSI/NFPA 70, "National Electrical Code" (NEC).
These devices respond directly or indirectly to changes in temperature, humidity, or pressure to effect
temperature control of equipment or appliance operation, etc. These devices may be investigated for
functioning during the normal operation (regulating) of the controlled appliance or for functioning in the
event of an abnormal condition (limiting) of the controlled appliance.
Ratings — Temperature-indicating and regulating equipment is Listed with a maximum rating of 600 V.
A control rated in amps is tested with an inductive (75-80 percent power factor) load for alternating
current ratings unless a direct current (noninductive) rating is specified.
Manual reset controls — An "M1" or "M2" marking indicates the following manual reset functions are
M1 - Controls that automatically reset to the "closed" position after normal operating conditions
have been restored if the reset means is held in the "reset" position.
M2 - Controls that do not automatically reset to the "closed" position if the reset means is held in
the "reset" position.
Room thermostats — Room thermostats intended for the direct control of electric space heating
equipment that are to be permanently connected electrically and are provided with a marked or implied
"off" position, disconnect all ungrounded poles of the supply circuit when adjusted to the "off" position.
Equipment suitable for outdoor use — Equipment identified with an enclosure type designation or as
"Rain tight" or "Rainproof" is intended for use as indicated in Electrical Equipment for Use in Ordinary
Locations (AALZ).
Class 2 output circuits — A device that incorporates a Class 2 transformer or a Class 2 power source
with provision for field wiring of the output circuit is marked to permit wiring as specified in Article 725 of
the NEC for the Class 2 circuit.
Equipment intended for agricultural use — A control marked to indicate use in agricultural buildings in
accordance with Article 547 of the NEC has been tested in the environmental conditions of Paragraph
547.1(A) and 547.1(B) of the NEC.
Motor operators — The Listings of motor operators do not include valves or other connected
mechanical loads.
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Temperature-indicating and regulating equipment is marked with the company's name or trademark, a
distinctive catalog number, and the electrical ratings. Additional markings may be required based on the
individual Listing reports.
Safety controls for gas- and oil-fired appliances, electric central furnaces, boilers and duct heaters are
covered under Controls, Limit (MBPR), Controls, Primary Safety (MCCZ) or Switches (MFHX).
Controls for refrigeration and air conditioning (except remote, wall-mounted room thermostats) are
covered under Controllers, Refrigeration (SDFY).
For additional information, see Electrical Equipment for Use in Ordinary Locations (AALZ).
The basic standard used to investigate products in this category is UL 873, "Temperature-Indicating and
-Regulating Equipment". Alternatively, products may be investigated to Part 1 and the appropriate Part
2s of UL 60730, "Automatic Electrical Controls for Household and Similar Use". The standard
designation is noted in the individual Listings.
The Listing Mark of Underwriters Laboratories Inc. on the product is the only method provided by UL to
identify products manufactured under its Listing and Follow-Up Service. The Listing Mark for these
products includes the UL symbol (as illustrated in the Introduction of this Directory) together with the
word "LISTED," a control number, and the product name "Temperature Indicating Equipment" or
"Temperature Regulating Equipment" or other appropriate product name as shown in the individual
Last Updated on 2004-07-26
This page and all contents are Copyright © 2005 by Underwriters Laboratories Inc.®
The appearance of a company's name or product in this database does not in itself assure that products so
identified have been manufactured under UL's Follow-Up Service. Only those products bearing the UL Mark should
be considered to be Listed and covered under UL's Follow-Up Service. Always look for the Mark on the product.
UL permits the reproduction of the material contained in the Online Certification Directory subject to the following
1. The Guide Information, Designs and/or Listings (files) must be presented in their entirety and in a nonmisleading manner, without any manipulation of the data (or drawings).
2. The statement "Reprinted from the Online Certifications Directory with permission from Underwriters
Laboratories Inc." must appear adjacent to the extracted material. In addition, the reprinted material must
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