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UL 353 Document Information:
Title
UL Standard for Safety Limit Controls
Underwriters Laboratories Inc.
Publication Date:
Sep 23, 1994
Scope:
These requirements cover limit controls, furnace fan controls, and
other interlocks which are
essentially switches responding to changes in liquid level, pressure,
or temperature. Although not
limited to such specific applications, these safety controls include
those intended primarily to
safeguard heating appliances, heating systems, processing systems, and
air-conditioning and
ventilating systems.
These requirements do not cover thermal protectors for motors and
fluorescent-lamp ballasts.
These controls are for use in ordinary locations. Requirements for the
installation and use of
limit controls are included in Standards of the National Fire
Protection Association, such as those
for Installation of:
Air-Conditioning and Ventilating Systems, NFPA 90A-1993,
Warm-Air Heating and Air-Conditioning Systems, NFPA 90B-1993,
Oil-Burning Equipment, NFPA 31, ANSI Z95.1-1993,
National Fuel Gas Code, NFPA 54-1990,
Ovens and Furnaces, NFPA 86-1990, and
Prevention of Furnace Explosions in Fuel Oil and Natural Gas-Fired
Watertube Boiler Furnaces With
One Burner, NFPA 85C-1991.
These requirements cover equipment rated not more than 600 volts and
intended for installation in
accordance with the requirements of the National Electrical Code,
ANSI/NFPA 70.
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
or of electric shock or injury to persons shall be evaluated using
appropriate additional component
and end-product requirements to maintain the 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 does not comply with
this standard. Revision of requirements shall be proposed and adopted
in conformance with the
methods employed for development, revision, and implementation of this
standard.
1.5 revised April 30, 2001
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