The utilization of Interlocks is supported by the following standards and regulations:

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 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 Regulations:
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

Other Application Links AVAILABLE:

Overview
An overview of the importance of key interlock systems in your sequential operations.

Technical Papers
Kirk Key Interlock Company has published these technical papers for your reference when specifying key interlocks in your project.

Links to Standards and Safety Organizations
Kirk Key Interlock is continually working with safety and standards organizations to recognize that key interlocks are appropriate in many more circumstances than manufacturers and installation contractors are currently utilizing them.

Actual Cases of Electrical Equipment Accidents
A compilation of brief case histories involving electrical accidents that led to severe injuries, loss of life, and large financial settlements.