EPCO Grounding PigTails NEC References
Article 110 Requirements for Grounding PigTails Electrical Installations
Article 110.14 (A): Terminals. Connection of conductors to terminal parts shall ensure a thoroughly good connection without damaging the conductors and shall be made by means of pressure connectors (including set-screw type), solder lugs, or splices to flexible leads. Connection by means of wire-binding screws or studs and nuts that have upturned lugs or the equivalent shall be permitted for 10 AWG or smaller conductors. Terminals for more than one conductor and terminals used to connect aluminum shall be so identified.
Article 110.14 (B): Splices. Conductors shall be spliced or joined with splicing devices identified for the use or by brazing, welding, or soldering with a fusible metal or alloy. Soldered splices shall first be spliced or joined so as to be mechanically and electrically secure without solder and then be soldered.
All splices and joints as the free ends of conductors shall be covered with an insulation equivalent to that of the conductors or with an insulating device identified for the purpose. Wiring connectors or splicing means installed on conductors for direct burial shall be listed for such use.
Article 250.8: Connection of Grounding and Bonding Equipment
Grounding conductors and bonding jumpers shall be connected by exothermic welding, listed pressure connectors, listed clamps, or other listed means. Connection devices or fittings that depend solely on solder shall not be used. Sheet metal screws shall not be used to connect grounding conductors or connection devices to enclosures.
Section 250.8 prohibits the use of sheet metal screws as a means of directly attaching equipment grounding conductors to equipment or as a means for attaching connection devices for equipment grounding conductors to equipment. Connection means that are listed, that are part of listed equipment, or that are exothermically welded are required to ensure a permanent and low-resistance connection. Exhibit 250.2 and Exhibit 250.3 illustrate two methods of attaching an equipment bonding jumper to a grounded metal box.
Exhibit 250.2 Use of a grounding screw to attach equipment bonding jumper to a metal box.
Exhibit 250.3 Use of listed grounding clip to attach a grounding conductor to a metal box.