UL 474:2004 pdf download Dehumidifiers
2.3 Undated references
2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shallbe interpreted as referring to the latest edition of that code or standard.
3 Operating Instructions
3.1 A dehumidifier shall be provided with instructions containing directions and information which themanufacturer considers necessary for use and maintenance of the appliance.
3.2 A copy of the manufacturer’s instructions, or equivalent information, intended to accompany eachdehumidifier,is to be furnished with the sample submitted for investiaation, These instructions are to beused as a guide in the examination and test of the dehumidifier, For this purpose, a printed edition is notrequired initially if rough draft instructions or information as to what the instructions will include aresubmitted for review as part of the investigation.
CONSTRUCTION
4 General
4.1 Ferrous metal parts used to support or retain electrical components in position shall be protectedagainst corrosion by metallic or nonmetallic coatings, such as plating or painting.
Exception: This requirement does not apply to parts, such as washers, screws, bolts, and the like, wherecorrosion of such unprotected parts would not affect compliance with the requirements of this standard.
5 Assembly
5.1 Opening in the enclosure of a dehumidifier shall be designed and located to reduce the risk ofunintentional contact with:
a) Uninsulated live parts,
b) Parts which may cause injury to persons, such as fan blades and blower wheels, and
c) Electric heater elements.
The minor dimension of such openings shall not permit passage of a 1 inch (25.4 mm) diameterhemispherically-tipped rod, applied with a force of 2.5 pounds (11.1 N) In evaluating openings, parts ofthe enclosure, such as covers, panels, and grilles are to be removed unless tools are required for theirremoval or when exposed, a moving part is made inoperative or an uninsulated electrical part isde-energized through the use of interlocking devices.
5.2 An opening is acceptable if the probe illustrated in Figure 5.1 cannot contact uninsulated live parts.film coated wire, moving parts, and heater elements. The probe is to be applied:
a) With a force of 2.5 pounds (11.1 N) and
b) In any possible configuration and to any depth that the size of an opening will permit.
The probe is to be rotated or angled to any possible position before, during, or after insertion through theopening; and, if necessary, the configuration of the probe may be changed after the probe has beeninserted through the opening.
Exception: For film-coated wire, an opening in the motor enclosure of 3/4 inch (1 9.0 mm) or less is acceptable if the probe illustrated in Figure 5.2 cannot contact the wire.