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1、 Tentative Interim Amendment NFPA 70E Standard for Electrical Safety Requirements for Employee Workplaces 2004 Edition Reference: Table 130.7 (C) (9) (a) TIA 04-1 (NFPA 70E) (SC-04-4-9/Log 779) Pursuant to Section 5 of the NFPA Regulations Governing Committee Projects, the National Fire Protection A
2、ssociation has issued the following Tentative Interim Amendment to NFPA 70E, Standard for Electrical Safety Requirements for Employee Workplaces, 2004 edition. The TIA was processed by the Electrical Safety Requirements for Employee Workplaces Committee, and was issued by the Standards Council on Ap
3、ril 15, 2004, with an effective date of May 5, 2004. A Tentative Interim Amendment is tentative because it has not been processed through the entire standards-making procedures. It is interim because it is effective only between editions of the standard. A TIA automatically becomes a proposal of the
4、 proponent for the next edition of the standard; as such, it then is subject to all of the procedures of the standards-making process. 1. Revise existing Notes 1, 2, 4, and 5 for Part II, Table 130.7 (C) (9) (a), as follows: 1. Maximum of 25 kA short circuit current available, 0.03 second (2 cycle)
5、fault clearing time. 2. Maximum of 65 kA short circuit current available, 0.03 second (2 cycle) fault clearing time 4. Maximum of 65 42 kA short circuit current available, 0.33 second (20 cycle) fault clearing time. 5. Maximum of 65 35 kA short circuit current available, up to 1.0 0.5 second (60 30
6、cycle) fault clearing time. 2. Add references to Notes 4 and 5 at the following locations (highlighted) within the table: Task (Assumes Equipment Is Energized, and Work Is Done Within the Flash Protection Boundary) Hazard/ Risk Category V-rated Gloves V-rated Tools Panelboards rated 240 V and below
7、Notes 1 and 3 Circuit breaker (CB) or fused switch operation with covers on 0 N N CB or fused switch operation with covers off 0 N N Work on energized parts, including voltage testing 1 Y Y Task (Assumes Equipment Is Energized, and Work Is Done Within the Flash Protection Boundary) Hazard/ Risk Cate
8、gory V-rated Gloves V-rated Tools Remove/install CBs or fused switches 1 Y Y Removal of bolted covers (to expose bare, energized parts) 1 N N Opening hinged covers (to expose bare, energized parts) 0 N N Panelboards or Switchboards rated 240 V and up to 600 V (with molded case or insulated case circ
9、uit breakers) Notes 1 and 3 CB or fused switch operation with covers on 0 N N CB or fused switch operation with covers off 1 N N Work on energized parts, including voltage testing 2* Y Y 600 V Class Motor Control Centers (MCCs) Notes 2 (except as indicated) and 3 CB or fused switch or starter operat
10、ion with enclosure doors closed 0 N N Reading a panel meter while operating a meter switch 0 N N CB or fused switch or starter operation with enclosure doors open 1 N N Work on energized parts, including voltage testing 2* Y Y Work on control circuits with energized parts 120 V or below exposed 0 Y
11、Y Work on control circuits with energized parts 120 V, exposed 2* Y Y Insertion or removal of individual starter “buckets” from MCC Note 4 3 Y N Application of safety grounds, after voltage test 2* Y N Removal of bolted covers (to expose bare, energized parts) Note 4 2* N N Opening hinged covers (to
12、 expose bare, energized parts) 1 N N 600 V Class Switchgear (with power circuit breakers or fused switches) Notes 5 and 6 CB or fused switch operation with enclosure doors closed 0 N N Reading a panel meter while operating a meter switch 0 N N CB or fused switch operation with enclosure doors open 1
13、 N N Task (Assumes Equipment Is Energized, and Work Is Done Within the Flash Protection Boundary) Hazard/ Risk Category V-rated Gloves V-rated Tools Work on energized parts, including voltage testing 2* Y Y Work on control circuits with energized parts 120 V or below, exposed 0 Y Y Work on control c
14、ircuits with energized parts 120 V, exposed 2* Y Y Insertion or removal (racking) of CBs from cubicles, doors open 3 N N Insertion or removal (racking) of CBs from cubicles, doors closed 2 N N Application of safety grounds, after voltage test 2* Y N Removal of bolted covers (to expose bare, energize
15、d parts) 3 N N Opening hinged covers (to expose bare, energized parts) 2 N N Other 600 V Class (277 V through 600 V, Nominal) Equipment Notes 2 (except as indicated) and 3 Lighting or small power transformers (600 V, maximum) Removal of bolted covers (to expose bare, energized parts) 2* N N Opening
16、hinged covers (to expose bare, energized parts) 1 N N Work on energized parts, including voltage testing 2* Y Y Application of safety grounds, after voltage test 2* Y N Revenue meters (kW-hour, at primary voltage and current) Insertion or removal 2* Y N Cable trough or tray cover removal or installa
17、tion 1 N N Miscellaneous equipment cover removal or installation 1 N N Work on energized parts, including voltage testing 2* Y Y Application of safety grounds, after voltage test 2* Y N (Notes 1, 2, 4, and 5 are not applicable to the remainder of the table, so the rest of the table is not shown.) Copyright 2004 All Rights Reserved NATIONAL FIRE PROTECTION ASSOCIATION