My question;
Based on information below; it appears that we can use the portable means available to lock out general purpose receptacle and lighting circuits at a circuit breaker panel. Can you expound on why certain equipment/devices require the permanent means of lock out and others do not?
As I understand it, 2008 NEC Code addition requires a means to add a lock to the disconnect and the mechanism for adding the lock remain in place even when the lock is removed. In the past, an installer or maintainer may or may not have had the specific type of temporary mechanism needed to lock the disconnecting means. Now the disconnecting means will have locking provisions that cannot be easily removed.
The provision for locking or adding a lock to the disconnecting means shall be installed on or at the switch or circuit breaker used as the disconnecting means and shall remain in place with or without the lock installed.
Code Ref.:
Chapter 4 Equipment for General Use:
422.31 Disconnection of Permanently Connected Appliances.
422.31 Disconnection of Permanently Connected Appliances.
(B) Appliances Rated over 300 Volt-Amperes or 1/8 Horsepower.
III. Control and Protection of Fixed Electric Space-Heating Equipment
424.19 Disconnecting Means.
430.102 Location.
(A) Controller.
(B) Motor. (2) Controller Disconnect.
430.227 Disconnecting Means.
440.14 Location.
490.44 Fused Interrupter Switches.
Chapter 6 Special Equipment:
610.31 Runway Conductor Disconnecting Means.
610.32 Disconnecting Means for Cranes and Monorail Hoists.
620.51 Disconnecting Means.
620.54 Heating and Air-Conditioning Disconnecting Means.
620.55 Utilization Equipment Disconnecting Means.
625.23 Disconnecting Means.
647.8 Lighting Equipment.
665.12 Disconnecting Means.
665.22 Access to Internal Equipment.
675.8 Disconnecting Means.
(B) Main Disconnecting Means.
Based on information below; it appears that we can use the portable means available to lock out general purpose receptacle and lighting circuits at a circuit breaker panel. Can you expound on why certain equipment/devices require the permanent means of lock out and others do not?
As I understand it, 2008 NEC Code addition requires a means to add a lock to the disconnect and the mechanism for adding the lock remain in place even when the lock is removed. In the past, an installer or maintainer may or may not have had the specific type of temporary mechanism needed to lock the disconnecting means. Now the disconnecting means will have locking provisions that cannot be easily removed.
The provision for locking or adding a lock to the disconnecting means shall be installed on or at the switch or circuit breaker used as the disconnecting means and shall remain in place with or without the lock installed.
Code Ref.:
Chapter 4 Equipment for General Use:
422.31 Disconnection of Permanently Connected Appliances.
422.31 Disconnection of Permanently Connected Appliances.
(B) Appliances Rated over 300 Volt-Amperes or 1/8 Horsepower.
III. Control and Protection of Fixed Electric Space-Heating Equipment
424.19 Disconnecting Means.
430.102 Location.
(A) Controller.
(B) Motor. (2) Controller Disconnect.
430.227 Disconnecting Means.
440.14 Location.
490.44 Fused Interrupter Switches.
Chapter 6 Special Equipment:
610.31 Runway Conductor Disconnecting Means.
610.32 Disconnecting Means for Cranes and Monorail Hoists.
620.51 Disconnecting Means.
620.54 Heating and Air-Conditioning Disconnecting Means.
620.55 Utilization Equipment Disconnecting Means.
625.23 Disconnecting Means.
647.8 Lighting Equipment.
665.12 Disconnecting Means.
665.22 Access to Internal Equipment.
675.8 Disconnecting Means.
(B) Main Disconnecting Means.
