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UL 544 4th Edition, December 30, 1998
Complete Document
Superseded By: UL 60601-1
UL Standard for Safety Medical and Dental Equipment
Includes all amendments and changes through Announcement Bulletin , June 16, 2000
Additional Comments: W/D S/S BY UL 60601-1
Published By:UL (UL)
Page Count:188
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These requirements cover electric medical and dental equipment that is
intended for professional use by personnel in hospitals, nursing homes,
medical care centers, medical and dental offices and similar Health Care
Facilities including apparatus intended to be used with
oxygen-administering equipment.  The equipment covered is for use on
interior wiring systems in accordance with the National Electrical Code.
These requirements cover portable (cord-connected) equipment rated at
300 V or less and permanently connected equipment rated at 600 V or
less.

The Standard also covers general requirements for equipment batteries,
and battery-operated products that are energized by a battery supply
having a voltage of 300 V dc or less, or battery power and provisions
for connection to branch circuits rated 300 V or less in accordance with
the National Electrical Code.

These requirements do not cover electrically heated pads, refrigerated
medical equipment, X-ray equipment, hospital food warming cabinets and
carts, nurse call and intercommunication equipment, isolated power
systems, nor other equipment or appliances that are covered by separate
individual requirements.

These requirements do not cover equipment for use in hazardous locations
(with respect to flammable anesthetics), as defined in the National
Electrical Code, ANSI/NFPA No. 70.  Equipment intended for hospital
operating room use above the hazardous area is judged under the
requirements of this standard and in accordance with National Electrical
Code, ANSI/NFPA No. 70.

The requirements in this Standard do not consider the complete spectrum
of physiological or therapeutic effects, beneficial or otherwise, except
where generally accepted limits for potentially hazardous conditions are
defined.  Devices which necessitate the utilization of conditions
exceeding such accepted limits for patient treatment are intended for
use by or under the supervision of licensed medical persons.  Such
equipment shall be provided with appropriate warnings prominently
displayed on the device (see 71.1).

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 to
determine that the level of safety as originally anticipated by the
intent of this Standard is maintained.  A product whose features,
characteristics, components, materials, or systems conflict with
specific requirements or provisions of this Standard shall not be judged
to comply with this Standard.  Where appropriate, revision of
requirements shall be proposed and adopted in conformance with the
methods employed for development, revision, and implementation of this
Standard.

                  1.6 added December 30, 1998