SIZING BONDING JUMBER FOR BIG METAL PARTS

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azaher1972

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Saudi Arabia
GREETINGS TO ALL
WOULD SOMEONE HELP ME FIND IN THE NEC THE ANSWER TO

  • HOW I CAN SIZE THE WIRE USED TO BOND STEEL WALL LADDER OR BIG STEEL DOOR TO AN POTENTIAL BUS BAR
  • IF THE MAIN PANEL BOARD ALREADY HAS ITS BONDING JUMBER BETWEEN GROUND BAR AND NEUTRAL BAR HOW I SIZE THE WIRE USED TO BOND THE ENCLOSURE OF THE PANEL TO THE EARTHING BAR INSIDE IT FRON THE CODE I DONT THINK 250.66 IS FOR THAT ALSO A SUB PANEL HAS A BAR FOR GROUNDING , HOW I SIZE THE WIRE GROUNDING THE ENCLOSURE ??
  • BEST REGARDS
 
Please don't use CAPS. Thanks
If your "Main" Panel is a Service Panel (Utility) or the Main Panel on the load side of a SDS, the system bonding jumper would be sized per Table 250.66
Equipment grounding conductors on the load side of an overcurrent device are sized per 250.122
To my knowledge the NEC does not address grounding of ladders or steel doors.
Structural metal forming the frame of a building is bonded per 250.66.
 
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