Table 250.102(C)(1). Grounded Conductor, Main Bonding Jumper, System Bonding Jumper, and Supply-Side Bonding Jumper for Alternating-Current Systems.
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NEC Table 250.102(C)(1) is used for sizing the grounded conductor, main bonding jumper, system bonding jumper, and supply-side bonding jumper for alternating-current systems.
Article 250 is the largest article in the NEC® and contains the following three tables:
- Table 250.66 for sizing grounding electrode conductors of alternating-current systems.
- Table 250.102(C)(1) for sizing the grounded conductor, main bonding jumper, system bonding jumper, and supply-side bonding jumper for alternating-current systems.
- Table 250.122 for sizing equipment grounding conductors.
The left side of Table 250.102(C)(1) corresponds to the largest size ungrounded conductor installed, and the right side provides the required size of the grounded conductor, main bonding jumper, system bonding jumper, or supply-side bonding jumper.
Note 1 under Table 250.102(C)(1) contains the 12.5% rule to be used when the largest ungrounded conductor or equivalent area for parallel conductors is over 1100 kcmil copper or 1750 kcmil aluminum.
See image for an example of the table.