Subject 1573

Bulletin Dated: October 1, 2004

SUMMARY OF TOPICS

1. This bulletin addresses and resolves the comments received in response to UL's Subject 1573 proposal bulletin dated March 29, 2004, proposing revisions to the Fourth Edition of the Standard for Stage and Studio Luminaires and Connector Strips, UL 1573. The proposals have been revised to address the following areas (refer to Appendix A for full details):

• Leakage Current Test - UL proposes that power supply cord-connected UL 1573 products be required to comply with a leakage current test.

• Leakage Current Limits - UL proposes that leakage current limits of (a) 4.0 MIU apply to power supply cord-connected products that meet certain criteria; and (b) 0.5 MIU for all other power supply cord-connected products.

• New Glossary Entries - UL proposes several new Glossary definitions, including Fixed Equipment, Portable Equipment, and Stationary Equipment, to assist in understanding the application of the new and revised requirements.

• Power Supply Cord-Connected Connector Strip - UL proposes new paragraph 29A.2.9 to indicate that all circuits within the connector strip need to be energized during the conduct of the leakage current test and, where applicable, the location(s) for the leakage current warning marking proposed in Figure 60A.1.

• Product Use Categorization - UL proposes new paragraphs 2.5.1 - 2.5.3 to specify that a product needs to comply with the requirements for all applicable product-use categorizations (fixed, portable, stationary) where the manufacturer intends the installer to choose how the product is used.

• Leakage Current Measurement Circuits - UL proposes new figures showing the leakage current measurement circuits in a manner that is more readily applied to a wider number of products.

• Revised Criteria for Components Exempt from the Leakage Current Test - UL has revised proposed Section 29A extensively to provide more generic criteria for components exempt from the leakage current test.

• Appliance Wiring Material - UL proposes the use of certain appliance wiring material that meets appropriate insulation requirements which will exempt a product from being subjected to the leakage current test.

• Leakage Current for DC Products - UL has revised the proposals to address products intended for use on DC supply circuits.

• Permanence of Cord Tags - UL proposes to revise paragraph 53.4 to require all cord tags, including the new leakage current warning marking, to comply with the permanence of cord tag requirements in the Standard for Cord Sets and Power-Supply Cords, UL 817.

2. In response to comments received about the leakage current test proposals in UL's Subject 1573 bulletin dated March 29, 2004, this bulletin provides additional Rationale information for the proposed requirements.

3. This bulletin also requests your comments on the proposed 36-month effective date for the revised Leakage Current Test proposals in Appendix A.

COMMENTS DUE: DECEMBER 3, 2004