1 Scope

1.1 This standard applies to the following types of transfer switches that have a maximum rating of 1000 volts for use in non-hazardous locations, in accordance with Annex A1, Item 1:

1. a) Automatic transfer switches;

2. b) Manual or non-automatic transfer switches;

3. c) Closed transition transfer switches;

4. d) Hybrid transfer switches;

5. e) Transfer switches for fire pumps;

6. f) Bypass/isolating switches;

7. g) Softload transfer switches;

8. h) Transfer switches intended for use as service equipment;

9. i) Transfer switches intended for use in mobile/portable applications such as recreational vehicles, motor homes, camping trailers, and mobile health care facilities;

10. j) Inlet assemblies for transfer switch equipment;

11. k) Arc resistant transfer switch equipment;

12. l) Cord connected transfer switch equipment;

13. m) Combination meter/transfer equipment assemblies; and

14. n) In Mexico and the United States, branch circuit emergency lighting transfer switches (BCELTS).

15. In Canada, the requirements for BCELTS do not apply.

Summary of Topics

This new edition of ANSI/UL 1008 dated July 13, 2022 includes the following changes:

– Marking Requirements– Scope of Annex J– Miscellaneous Updates– Table 2– Revised LSI Circuit Breaker Markings in Annex I– New Annex K for Arc Resistant Design– New Annex L for Electromagnetic Compatibility– Annex M for Cord Connected Transfer Switch Equipment– Marking/Instruction for Short Circuit Withstand Rating when Protected by Fuses– Revision of Requirements for Transfer Switches with Integral Inlets– Table 25– Changes to Align with the 2020 NEC– Revisions for Inlets Rated 100A and Greater for Compliance with the 2020 NEC– New Annex N for Combination Meter/Transfer Equipment Assemblies