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UL 511

6th Edition, December 27, 1994

Complete Document

UL Standard for Safety Porcelain Cleats, Knobs, and Tubes

Includes all amendments and changes through Revision Page(s) , July 28, 1998


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W/D NO S/S
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Product Details:

  • Revision: 6th Edition, December 27, 1994
  • Published Date: July 28, 1998
  • Status: Not Active, See comments below
  • Document Language: English
  • Published By: UL (UL)
  • Page Count: 20
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

These requirements cover insulating cleats, knobs, and tubes for the support of conductors of open wiring or concealed knob and tube wiring of circuits involving potentials of 600 volts or less, in accordance with the National Electrical Code, NFPA 70.

These requirements do not cover split knobs and multiple-wire cleats for conductors larger than No. 4 AWG (21.2 mm²), solid knobs for conductors larger than No. 4/0 AWG (107.2 mm²), knobs not intended for over-surface wiring, or tubes having an internal diameter greater than 2-1/2 inches (63.5 mm).

A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involve 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.

*1.3 revised July 28, 1998*