// CODE SNIPPET
(C) Size — Supply-Side Bonding Jumper
JUMP TO FULL CODE CHAPTER
The supply-side bonding jumper shall not be smaller than specified in Table 250.102(C)(1).
|Size of Largest Ungrounded Conductor or Equivalent Area for Parallel Conductors (AWG/kcmil)||Size of Grounded Conductor or Bonding Jumper* (AWG/kcmil)|
|Copper||Aluminum or Copper-Clad Aluminum||Copper||Aluminum or Copper-Clad Aluminum|
|2 or smaller||1/0 or smaller||8||6|
|1 or 1/0||2/0 or 3/0||6||4|
|2/0 or 3/0||4/0 or 250||4||2|
|Over 3/0 through 350||Over 250 through 500||2||1/0|
|Over 350 through 600||Over 500 through 900||1/0||3/0|
|Over 600 through 1100||Over 900 through 1750||2/0||4/0|
|Over 1100||Over 1750||See Notes 1 and 2.|
1. If the ungrounded supply conductors are larger than 1100 kcmil copper or 1750 kcmil aluminum, the grounded conductor or bonding jumper shall have an area not less than 121/2 percent of the area of the largest ungrounded supply conductor or equivalent area for parallel supply conductors. The grounded conductor or bonding jumper shall not be required to be larger than the largest ungrounded conductor or set of ungrounded conductors.
|2. If the ungrounded supply conductors are larger than 1100 kcmil copper or 1750 kcmil aluminum and if the ungrounded supply conductors and the bonding jumper are of different materials (copper, aluminum, or copper-clad aluminum), the minimum size of the grounded conductor or bonding jumper shall be based on the assumed use of ungrounded supply conductors of the same material as the grounded conductor or bonding jumper and will have an ampacity equivalent to that of the installed ungrounded supply conductors.|
|3. If multiple sets of service-entrance conductors are used as permitted in 230.40, Exception No. 2, or if multiple sets of ungrounded supply conductors are installed for a separately derived system, the equivalent size of the largest ungrounded supply conductor(s) shall be determined by the largest sum of the areas of the corresponding conductors of each set.|
|4. If there are no service-entrance conductors, the supply conductor size shall be determined by the equivalent size of the largest service-entrance conductor required for the load to be served.|
|*For the purposes of applying this table and its notes, the term bonding jumper refers to main bonding jumpers, system bonding jumpers, and supply-side bonding jumpers.|
Where the ungrounded supply conductors are paralleled in two or more raceways or cables, and an individual supply-side bonding jumper is used for bonding these raceways or cables, the size of the supply-side bonding jumper for each raceway or cable shall be selected from Table 250.102(C)(1) based on the size of the ungrounded supply conductors in each raceway or cable. A single supply-side bonding jumper installed for bonding two or more raceways or cables shall be sized in accordance with 250.102(C)(1).
Informational Note No. 1: The term supply conductors includes ungrounded conductors that do not have overcurrent protection on their supply side and terminate at service equipment or the first disconnecting means of a separately derived system.
Related Code Sections
(C) Wiring and Protection, Size — Supply-Side Bonding Jumper
Jumper, System Bonding Jumper, and Supply-Side Bonding Jumper for Alternating-Current Systems Size of Largest Ungrounded Conductor or Equivalent ...
National Electrical Code 2020 of Minnesota > 2 Wiring and Protection > 250 Grounding and Bonding > 250.102 Grounded Conductor, Bonding Conductors, and Jumpers > (C) Size — Supply-Side Bonding Jumper
(2) Wiring and Protection, Supply-Side Bonding Jumper
type or of the wire or bus type as follows: A supply-side bonding jumper of the wire type shall comply with 250.102(C), based on the size ...
National Electrical Code 2020 of Minnesota > 2 Wiring and Protection > 250 Grounding and Bonding > 250.30 Grounding Separately Derived Alternating-Current Systems > (A) Grounded Systems > (2) Supply-Side Bonding Jumper
(C) Equipment for General Use, Used as Service Equipment
using an equipment-bonding jumper or a supply-side bonding jumper sized in accordance with 250.122 or 250.102(C)(1) as applicable. Exception ...
National Electrical Code 2020 of Minnesota > 4 Equipment for General Use > 408 Switchboards, Switchgear, and Panelboards > 408.3 Support and Arrangement of Busbars and Conductors > (C) Used as Service Equipment
(6) Wiring Methods and Materials, Bonding Jumpers
Where parallel equipment bonding jumpers or supply-side bonding jumpers are installed in raceways, they shall be sized and installed in accordance ...
National Electrical Code 2020 of Minnesota > 3 Wiring Methods and Materials > 310 Conductors for General Wiring > 310.10 Uses Permitted > (G) Conductors in Parallel > (6) Bonding Jumpers