trapped key interlocks
safety standards
Safety Standards

IEEE and ANSI (American National Standards Institute)

  • IEEE Std C37.20.1-1993 for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear. 

  • IEEE Std C37.20.2-1993 for Metal-Clad and Station-Type Cubicle Switchgear. 

  • ANSI/IEEE Std C37.20.3-1987 for Metal-Enclosed Interrupter Switchgear.

  • IEEE Std C37.20.6-1997 for 4.76kV to 38kV Rated Grounding and Testing Devices Used In Enclosures. 

  • IEEE Std C37.35-1995 Guide for the Application, Installation, Operation, and Maintenance of High-Voltage Air Disconnecting and Interrupter Switches. 

  • ANSI/IEEE Std C37.38-1989 for Gas-Insulated, Metal-Enclosed Disconnecting, Interrupter, and Grounding Switches. 

  • IEEE Std C37.59-1996 Standard Requirements for Conversion of Power Switchgear Equipment.

  • ANSI Std C37.121-1989 Requirements for Unit Substations. 

  • IEEE Std 241-1990 Recommended Practice for Electric Power Systems in Commercial Buildings. 

  • IEEE Std 499-1997 Recommended Practice for Cement Plant Electric Drives and Related Electrical Equipment. 

  • ANSI/IEEE Std 502-1985 Guide for Protection, Interlocking, and Control of Fossil-Fueled Unit-Connected Steam Stations. 

  • IEEE Std 510-1983 Recommended Practices for Safety in High-Voltage and High-Power Testing. 

  • IEEE Std 1015-1997 Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercial Power Systems.

 

NEC (National Electric Code) and NFPA (National Fire Protection Association)

  • NEC Article 440-33 Air-Conditioning and Refrigeration Equipment.

  • NEC Article 440-34 Air-Conditioning and Refrigeration Equipment. 

  • NEC Article 460-24 Switching. 

  • NEC Article 490-21 Circuit Interrupting Devices, High-Voltage Fuses. 

  • NEC Article 490-22 Equipment Over 600 Volts, Isolating Means. 

  • NEC Article 490-42 Interlocks - Interrupter Switches. 

  • NEC Article 490-45 Interlocks - Circuit Breakers.

  • NEC Article 665-22 Guarding, Grounding, and Labeling. 

  • NEC Article 710-22 Isolating Means. 

  • NEC Article 710-24 Metal-Enclosed Power Switchgear and Industrial Control Assemblies. 

  • NEC Article 810-71 Interior Installation - Transmitting Stations.

  • NFPA-70E Standard for Electrical Safety Requirements for Employee Workplaces 2000 Edition. 

  • NFPA-79 Electrical Standard for Industrial Machinery 1997 Edition.

OSHA (Occupational Safety and Health Administration)

 
  • 1910.212 

  • 1910.217 

  • 1910.255 

  • 1910.261 

  • 1910.262 

  • 1910.265 

  • 1910.269 

  • 1910.305 

  • 1910.308 

  • 1910.333 

  • 1910.66 

  • 1926.405 

  • 1926.406 

  • 1926.408

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