UL 745-2-14:2004 pdf download PROPOSED REQUIREMENTS FOR THE SECOND EDITION OF THE STANDARD FOR INSUL ATING BUSHINGS, UL 635
1.SCOPE
RATIONALE
UL proposes to revise Paragraph 1.2 by indicating that the requirements of UL 635 are not applicable tobushings used in a variety of applications. A description of those bushings is provided in the Proposalsection of this item.
The proposal represents UL’s current and historical criteria for which types of bushings are covered bythe reauirements of UL 635. UL does not evaluate (and has never evaluated) the bushings described inthe Proposal section of this item for Listing or Recognition in accordance with UL 635. UL concludedthat references to those bushings were inadvertently omitted from Paragraph 1.2.
PROPOSAL
1.2 This Standard does not cover bushings used in the following applications:
a) Bushings for the protection of uninsulated conductors.
b) Strain-relief insulating bushings used to hold more than one cable, wire, or cord.
c) Bushings that are an integral part of a flexible cord.
d) Bushings used at the end of a raceway at the point of connection to open wiring andbushings used in conjunction with rigid or flexible conduit, conduit fittings, electrical metallictubing, armored cable, or non-metallic sheathed cable.
e) Bushings for power circuit breakers, transformers. or similar power apparatus rated morethan 600 volts.
fBushings intended for outdoor use.
g) Bushings used on armored cable between the conductors and the outer armor
h) Insulating bushinas provided either separately or as part of a conduit fittina
i) Rainproof or liquid tight bushings
i) Bushings for use on the ends of rigid or flexible conduit.
k) The following items covered by the Standard for Conduit Tubing, and Cable Fittinas. UL514B
1. Cord grips:
2.Insulating bushings:
3.Liquid-tight flexible cord fittings:
4.Mesh grips
5Strain relief grips
6Strain relief grips for bus drop cables.
7Strain relief grips for flexible cords: and
8.Strain relief with wire mesh cord grips
2. MATERIALS
RATIONALE
UL proposes to reorganize the format of Section 5 by adding subsections for requirements forflammability, temperature ratings, materials substitution, and molding considerations. The intent of theproposal is to provide clarity to the current material requirements in UL 635. ln addition, the proposalwould clarify the material substitution requirements as well as the extent to which the materials may ormay not be modified during the molding process.
The proposed revision of Section 5 includes the following changes:
1. Paragraphs 5.1, 5.3, and 5.4 have been re-designated as Paragraphs 5.1.1, 5.1.2, and 5.1.3respectively. The proposed Paragraphs 5.1.1, 5.1.2, and 5.1.3 have been transferred to theproposed Subsection 5.1, titled“General.”
2. Paragraph 5.2 has been revised to include a reference to the lEC Standard for Test Flames- 50 W Horizontal and Vertical Flame Test Methods, 60695-11-10. Paragraph 5.2 has beenre-designated as Paragraph 5.2.2 and has been transferred to the proposed Subsection 5.2titled“Flammability.
3. The proposed temperature rating requirements would appear in UL 635 as Subsection 5.3the proposed requirements for materials substitution would appear in the standard asSubsection 5.4, and the proposed requirements for molding considerations would appear in thestandard as Subsection 5.5