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Subpart S Electrical

Subpart S Electrical. h:extprgppsubpts.ppt. Subpart S. Electrical Standards. 1910.301 Introduction. (a) Design Safety Standards for Electrical Systems 1910.302-308 1910.309-330 (future design) Safety-Related Work Practices 1910.331-360 (c) Safety-Related Maintenance Requirements

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Subpart S Electrical

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  1. Subpart SElectrical h:\extprg\pp\subpts.ppt

  2. Subpart S Electrical Standards

  3. 1910.301Introduction • (a) Design Safety Standards for Electrical Systems • 1910.302-308 • 1910.309-330 (future design) • Safety-Related Work Practices • 1910.331-360 • (c) Safety-Related Maintenance Requirements • 1910.361-380 • Safety Requirements for Special Equipment • 1910.381-399 • (e) Definitions - 1910.399 National Safety Educational Center 1-800-656-5317

  4. Industrial substations Conductors connecting supply of electricity Other outside conductors on premises Yards Carnivals Parking/Other lots Mobile homes Recreational vehicles 1910.302 - ElectricUtilization Systems • (a) Scope • (1) Coverage • Equipment installations used within or on buildings, • structures, and other premises, including: National Safety Educational Center 1-800-656-5317

  5. Ship installations Watercraft Railroad rolling stock Aircraft Automotive vehicles other than RV’s Railroad generating, transforming, transmitting or distribution of power Communication equipment Electric utilities 1910.302 - ElectricUtilization System (Cont) (a)(2) Not Covered: National Safety Educational Center 1-800-656-5317

  6. 1910.303(b)-(f) 1910.303(g)(2) 1910.304(e)(1)(i) 1910.304(e)(1)(iv)-(v) 1910.304(f)(1)(ii)-(v) 1910.304(f)(3)-(4) 1910.304(f)(5)(iv)(a)-(d) 1910.304(f)(5)(v)-(vi) 1910.304(f)(6)(i) 1910.305(g)(1)(i)-(iii) 1910.305(g)(2)(ii)-(iii) 1910.302 - ElectricUtilization Systems (Cont) (b) Extent of application (1) Requirements apply to all electrical installations (regardless of when designed and installed) in sections: National Safety Educational Center 1-800-656-5317

  7. 1910.302 - ElectricUtilization Systems (Cont) • (b)(2) Every system/equipment installed after March 15, 1972, and major replacements, modifications, repairs, or rehabilitation after March 15, 1972 of older systems, shall comply with 1910.302-308. National Safety Educational Center 1-800-656-5317

  8. 1910.303General Requirements • (a) Only approved conductors and equipment • (b) Examination, installation and use of equipment • (1) Electrical equipment free from recognized hazards likely to cause death/serious physical harm to employees [5(a)(1)] • (2) Installation and use - listed or labeled equipment shall be used or installed in accordance with any instructions included in the listing or labeling National Safety Educational Center 1-800-656-5317

  9. 1910.303 - GeneralRequirements (Cont) • (c) Splicing • Conductors joined or spliced by • Brazing • Welding • Soldering • Covered by insulation • (d) Arcing parts shall be enclosed National Safety Educational Center 1-800-656-5317

  10. 1910.303 - General Requirements (Cont) • (e) Marking - Electrical equipment shall be marked: • Manufacture’s name • Trademark • Voltage • Current • Wattage • Durable markings National Safety Educational Center 1-800-656-5317

  11. 1910.303 - GeneralRequirements (Cont) • (f) Identification of disconnecting means and circuits for the following shall be legibly marked and durable: • Motors • Appliances • Each service • Each feeder • Each branch circuit National Safety Educational Center 1-800-656-5317

  12. 1910.303 - GeneralRequirements ( • (g) 600V or less • (1)(i) Working space about electrical equipment (Table S-1) • (ii) Clear spaces: working space/no storage • (2) Guarding of live parts • 50V or more guarded against accidental contact by: • Approved cabinets/enclosures • Location in room/vault • Partitions/screens (only qualified persons) • Location on balcony, gallery, platform • Elevation: 8 ft. or more above floor National Safety Educational Center 1-800-656-5317

  13. 1910.303 - GeneralRequirements (Cont) • (h) Over 600V • (3) Workspace about equipment • See Table S-2 National Safety Educational Center 1-800-656-5317

  14. 1910.304 - Wiring Designand Protection • (a) Use/identification of grounded/grounding conductors • (1) Distinguishable from other conductors (Usually green) • (2) Polarity of connections • No reverse polarity on leads/terminals • (b) Branch circuits • (1) Reserved • (2) Outlet devices • Ampere rating not < load served National Safety Educational Center 1-800-656-5317

  15. 1910.304 - Wiring Designand Protection (Cont) • (c) Outside conductors - 600V or < • (1) Conductors on poles - horizontal climbing space not less than: • (i) Power conductors below communication conductors - 30” • (ii) Power conductors alone or above communication conductors - • 300V or less - 24” • > 300V - 30” • (iii) Communication conductors below power conductors • 300V or less - 24” • 300V or more - 30” National Safety Educational Center 1-800-656-5317

  16. 1910.304 - Wiring Designand Protection (Cont) • (c)(2) Minimum clearances from ground: • (i) 10 ft. - above finished grade, sidewalks, platforms • (ii) 12 ft. - over areas subject to vehicle traffic (not truck traffic) • (iii) 15 ft. - over areas subject to truck traffic • (iv) 18 ft. - over public streets, alleys, roads, driveways • (3) Clearance from building openings - conductors shall have clearance of at least 3 ft. from windows, porches, doors, and fire escapes National Safety Educational Center 1-800-656-5317

  17. 1910.304 - Wiring Designand Protection (Cont) • (c)(4) Clearance over roofs • Conductors shall have clearance of at least 8 ft. from highest point of roofs over which they pass • Exceptions: • (i) Voltage between conductors • 300V or < and roof slope 4” in 12--clearance from roofs 3 ft.; or, • (ii) Voltage between conductors • 300V or < and conductors do not pass over more than 4 ft. of overhang portion of roof--clearance from roofs 18” National Safety Educational Center 1-800-656-5317

  18. 1910.304 - Wiring Designand Protection (Cont) • (d) Services • (1) Disconnecting means • (i) General • Shall be provided to disconnect conductors (in buildings or structures) from service entrance conductors • Indicators for open and closed positions • Readily accessible location nearest point of entrance of the service-entrance conductors National Safety Educational Center 1-800-656-5317

  19. 1910.304 - Wiring Designand Protection (Cont’d) • (d)(2) Services > 600V • (i) Guarding -- Service entrance conductors installed as open wires accessible only to qualified persons • (ii) Warning signs -- High voltage signs for other than qualified employees National Safety Educational Center 1-800-656-5317

  20. 1910.304 - Wiring Designand Protection (Cont) • (e) Overcurrent protection • (1) Circuits 600V or < • (i) Protection of conductors and equipment from overcurrent • (ii) Grounded conductors • Except for motor running overload protection, no interruption of grounded conductors, unless all circuit conductors opened simultaneously • (iii) Disconnection of fuses and thermal cutouts • Except service fuses, all fuses, thermal cutouts, circuits > 150V to ground National Safety Educational Center 1-800-656-5317

  21. 1910.304 - Wiringand Protection (Cont) • (e)(1)(iv) Location in or on premises • Overcurrent devices readily building management personnel • (v) Arcing/Suddenly moving parts • Fuses/circuit breakers located or shielded so not to cause burns or injuries • (vi) Circuit breakers shall indicate • Open (Off) • Closed (On) National Safety Educational Center 1-800-656-5317

  22. 1910.304 - Wiring Designand Protection (Cont) • (f) Grounding • (1) Systems to be grounded • (i) All 3 wire DC systems - neutral conductor grounded • (ii) 2 wire DC systems over 50V to 300V between conductors - grounded • (2) Conductors to be grounded • AC systems - identified National Safety Educational Center 1-800-656-5317

  23. 1910.304 - Wiring Designand Protection (Cont) • (f)(3) Grounding connections • (4) Grounding path • Path to ground from circuits, equipment, enclosures - permanent and continuous National Safety Educational Center 1-800-656-5317

  24. 1910.304 - Wiring Designand Protection (Con) • (f)(5) Supports, enclosures and equipment to be grounded • (i) Metal cable trays, metal raceways, metal conductor enclosures shall be grounded • (v) Equipment connected by cord and plug • Non-current carrying metal parts of cord and plug connected equipment which may be energized shall be grounded IF: • in hazardous locations • operated at > 150V • of types such as: refrigerators, A.C., hand-held motor tools, tools used in wet locations, portable hand lamps National Safety Educational Center 1-800-656-5317

  25. 1910.305 - Wiring Methods,Components and Equipment • (a) Wiring methods • (1) General requirements • (i) Metal raceways, cable armor, and other metal enclosures shall be metallically joined together into continuous electric conductor and be connected to all boxes, fittings, cabinets for effective electrical continuity National Safety Educational Center 1-800-656-5317

  26. 1910.305 - WiringMethods, etc. (Cont) • (a)(2) Temporary wiring • (i) Uses permitted - 600V or < • (A) Remodeling, maintenance, repair, demolition • (B) Experimental or development work • (C) Period not > 90 days for Christmas lighting, etc. National Safety Educational Center 1-800-656-5317

  27. 1910.305 - WiringMethods, etc. (Cont) • (b)(1) Conductors entering cabinets, boxes, fittings • Protected from abrasion • Openings effectively closed • (2) Covers and canopies • Pull boxes, junction boxes, fittings provided with approved covers National Safety Educational Center 1-800-656-5317

  28. 1910.305 - WiringMethods, etc. (Cont) • (c) Switches • (1) Knife - Single-throw type • Blades dead - switch open position • Placed so gravity will not tend to close switch • (2) Faceplates for flush-mounted snap switches National Safety Educational Center 1-800-656-5317

  29. 1910.305 - WiringMethods, etc. (Cont) • (d) Switchboards and panel boards • Live parts located in dry locations • Accessible to qualified persons • Panel boards shall be mounted in cabinets, cutout boxes or enclosures and dead front National Safety Educational Center 1-800-656-5317

  30. 1910.305 - WiringMethods, etc. (Cont) • (e) Enclosures for damp or wet locations • (1) Cabinets, cutout boxes, fittings, boxes, panel board enclosures installed to prevent moisture in enclosures • Wet locations - weatherproof enclosures • (2) Weatherproof enclosures for • Switches, circuit breakers, switchboards in wet locations • (f) Conductors for general wiring shall be: • Insulated • Approved for voltage, operating temperature, location of use • Distinguishable by appropriate color or other suitable means National Safety Educational Center 1-800-656-5317

  31. 1910.305 - WiringMethods, etc. (Cont) • (g) Flexible cords and cables • (1) Approved usage • Pendants • Wiring of fixtures • Connection of portable lamps and appliances • Elevator cables • Wiring of cranes and hoists • Connection of stationary equipment to facilitate interchange National Safety Educational Center 1-800-656-5317

  32. 1910.305 - WiringMethods, etc. (Cont) • (g)(1)(iii) Flexible cords may not be used • As a substitute for fixed wiring • Where run through holes in walls, ceilings, floors • Where run through doorways, windows, openings • Attached to building surfaces • Concealed behind walls, ceilings, floors National Safety Educational Center 1-800-656-5317

  33. 1910.305 - WiringMethods, etc. (Cont) • (g)(2) Identification, splices and terminations • (i) Conductors - Flexible cords and cables used as grounded conductor or equipment grounding conductor shall be distinguishable. • Types SJ, SJO, SJT, SJTO, S, SO, ST, and STO shall be durable marked with: • Type designation • Size • Number of conductors National Safety Educational Center 1-800-656-5317

  34. 1910.305 - WiringMethods, etc. (Cont) • (g)(2)(ii) Flexible cords • Used only in continuous lengths (no splicing/taping) • Hard surface #12 or larger may be repaired, if splicing retains insulation and sheath properties • (iii) Flexible cords - connected to devices and fittings to provide strain relief • (j) Equipment for general use • (1)(i) Lighting fixtures, lampholders, lamps, receptacles and rosettes • No live parts exposed unless 8 ft. above National Safety Educational Center 1-800-656-5317

  35. 1910.306 - Specific PurposeEquipment and Installations • (a) Electric signs and outline lighting • (1) Disconnecting means (electronic/electromechanical controllers) - • Capable of being locked in open position National Safety Educational Center 1-800-656-5317

  36. 1910.306 - Specific PurposeEquipment (Cont) • (b) Cranes/Hoists • (1) Disconnecting means • Between runway contact conductors and power supply • Another means, capable of being locked in open position, shall be provided • (2) Control • Limit switch to prevent load block passing safe upper limit • (3) Clearance for working space/access to live parts - 2 ft. 6 in. National Safety Educational Center 1-800-656-5317

  37. 1910.306 - Specific PurposeEquipment (Cont) • (c) Elevators, dumbwaiters, escalators, moving walks • (1) Disconnecting means - Have single disconnecting means (ungrounded main power conductors) • (2) Warning signs • (3) Control panels • Cabinets with doors • Capable of being locked closed National Safety Educational Center 1-800-656-5317

  38. 1910.306 - Specific PurposeEquipment (Cont) • (d) Electric welders/disconnection means • (1) In supply circuit for • Each motor - generated arc welder • Each AC transformer • Each DC rectifier arc welder • (2) Switch/circuit breaker provided so resistance welders and control equipment isolated from supply circuit Not equipped with disconnect in welder National Safety Educational Center 1-800-656-5317

  39. 1910.306 - Specific PurposeEquipment (Cont) • (e) Data processing equipment • Disconnecting means to all • Electronic equipment in data processing and computer rooms • Air conditioning system National Safety Educational Center 1-800-656-5317

  40. 1910.306 - Specific PurposeEquipment (Cont) • (f) X-ray equipment - other than medical/dental use • (1) Disconnecting means • (i) In supply circuit • Readily accessible from X-ray control • (ii) High voltage switch or equivalent • (2) Control • (i) Radiographic/fluoroscopic types • Effectively enclosed/interlocks • (ii) Diffraction and irradiation types • Energy indication National Safety Educational Center 1-800-656-5317

  41. 1910.306 - Specific PurposeEquipment (Cont) • (g) Induction/dielectric heating equipment • (1) Scope • Industrial • Scientific • (2) Guarding/grounding • (i) Enclosures • (ii) Panel controls • (iii) Access to internal equipment • (iv) Warning labels - “Danger” • (v) Work applicator shielding • (vi) Disconnecting means National Safety Educational Center 1-800-656-5317

  42. 1910.306 - Specific PurposeEquipment (Cont) • (h) Electrolytic cells • (1) Scope • (2) Definitions • Cell line - assembly of electrically interconnected electrolytic cells supplied by DC power • Cell line attachments/auxiliary equipment • Cell line working zone • Electrolytic cells • (3) Application • (4) Disconnecting means • (5) Portable electric equipment National Safety Educational Center 1-800-656-5317

  43. 1910.306 - Specific PurposeEquipment (Cont) • (h)(6) Power supply circuits and receptacles for portable electric equipment • (7) Fixed/portable electric equipment • (8) Auxiliary non-electric connections • (9) Cranes/hoists National Safety Educational Center 1-800-656-5317

  44. 1910.306 - Specific PurposeEquipment (Cont) • (i) Electrically driven/controlled irrigation machines • (1) Lighting protection • (2) Disconnecting means • (j) Swimming pools, fountains, similar installations • (1) Scope • (2) Lighting and receptacles • (3) Cord/plug connected equipment • (4) Underwater equipment • (5) Fountains National Safety Educational Center 1-800-656-5317

  45. Electrical Safety-Related Work Practices Standard 29 CFR 1910, Subpart S National Safety Educational Center 1-800-656-5317

  46. 1910.331 - Scope Covers both qualified and unqualified persons working on, near or with electrical conductors and equipment. National Safety Educational Center 1-800-656-5317

  47. 1910.331 - Scope Contains requirements for: • Working on or near electrical equipment • Use of electrical protective equipment • The safe use of electrical equipment National Safety Educational Center 1-800-656-5317

  48. 1910.331 - Scope Does not cover work by qualified persons on: • Generation, transmission and distribution installations • Communication installations • Installations in vehicles • Railway installations National Safety Educational Center 1-800-656-5317

  49. 1910.332 - Training Required for employees who face the risk of electrical shock National Safety Educational Center 1-800-656-5317

  50. 1910.332 - Content of Training • Electrical safe work practices • Other safe work practices necessary for safety National Safety Educational Center 1-800-656-5317

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