subch. III of ch. PSC 114Subchapter III — Omissions, Changes or Additions to NESC-2017
Subch. III of ch. PSC 114 Note
PSC 114.007PSC 114.007Omissions, changes, additions to NESC-2017. Omissions, changes, or additions to the NESC-2017 are specified in this subchapter and are rules of the commission and not requirements of the NESC-2017.
PSC 114.007 AnnotationNote 1: Each omission, change or addition is found in the same location in this subchapter as the appropriate NESC part, section or subsection where the affected rule is found. Each change or addition has been prefixed by ch. PSC 114. Following the PSC designation is the referenced NESC section or subsection and the page on which it is found in the NESC. Example: PSC 114.096C [NESC 096C, p. 34]. The word “Change” following the section number and heading means that the corresponding wording of the NESC-2017 has been changed and that the new wording is substituted at the appropriate location. The word “Addition” following the section number and heading means that a new requirement is incorporated in the NESC-2017 and that the new requirement is inserted at the appropriate location.
PSC 114.007 NoteNote 2: To observe federal directives and recommendations that national standards adopt the metric system for units of measure, the numerical values of the NESC-2017 are stated in the metric system and in the customary inch-foot-pound system. To conform to this more international convention, this revision of the Wisconsin State Electrical Code, Volume 1 also adopts the same measurement convention. In the text, the metric value is now shown first with the customary inch-foot-pound value (in parentheses) following. In tables, the metric values are also given first and where the entire tables are duplicated, the table of metric values appears first with the table of inch-foot-pound values following.
PSC 114.007 HistoryHistory: CR 07-021: cr. Register January 2008 No. 625, eff. 2-1-08; CR 13-039: r. and recr. Register June 2014 No. 702, eff. 7-1-14; CR 18-007: am. Register February 2020 No. 770, eff. 3-1-20.
Section 1. Introduction to the National
Electrical Safety Code
PSC 114.010PSC 114.010Omissions. [NESC 010 through 016, pp. 1-6] Introduction to the National Electrical Safety Code (Section 1) (Omission) Rules 010 through 016 of the NESC-2017 are omitted and not incorporated as part of the Wisconsin State Electrical Code, Volume 1.
PSC 114.010 HistoryHistory: CR 07-021: cr. Register January 2008 No. 625, eff. 2-1-08; CR 13-039: r. and recr. Register June 2014 No. 702, eff. 7-1-14; CR 18-007: am. Register February 2020 No. 770, eff. 3-1-20.
Section 2. Definitions of Special Terms
PSC 114.02PSC 114.02Definitions of special terms.
PSC 114.02(1)(1)Administrative authority. [NESC Section 2., p. 7] (Change) Change the definition of “Administrative Authority” to read:
Administrative authority. The authority for the enforcement of this code is vested in the commission with respect to the installation and operation of circuits or equipment by public utilities and railroads in the exercise of their functions as utilities and railroads.
PSC 114.02(2)(2)Commission. [NESC Section 2, p. 8] (Addition) Add the following definition:
Commission. Public service commission of Wisconsin.
PSC 114.02 HistoryHistory: CR 07-021: cr. Register January 2008 No. 625, eff. 2-1-08; CR 13-039 r. and recr. Register June 2014 No. 702, eff. 7-1-14; CR 18-007: am. (title), r. (intro.), consol. (1) (intro.) and (a), renum. to (1) and am., consol. (2) (intro.) and (a), renum. to (2) and am. Register February 2020 No. 770, eff. 3-1-20.
Section 9. Grounding Methods for Electric Supply and Communications Facilities
PSC 114.092PSC 114.092Point of connection of grounding conductor.
PSC 114.092(1)(1)Cable with insulating jacket. [NESC 092B2b(3), p. 25] (Change) Change paragraph (3) to read:
(3) Cable with insulating jacket
Additional bonding and connections between the cable insulation shielding or sheaths and the system ground are recommended. Where uninsulated cable joints in multi-grounded shielded cable systems are exposed to contact by personnel, the shielding (including sheath or concentric neutral) at the joint shall be grounded. Accessible insulated cable joints are not required to be grounded by this rule. Where multi-grounded shielding cannot be used for electrolysis of sheath-current reasons, the shielding sheaths and splice-enclosure devices shall be insulated for the voltage that may appear on them during normal operation. Bonding transformers or reactors may be substituted for direct ground connection at one end of the cable.
PSC 114.092(2)(2)Current in grounding conductor. [NESC 092D, p. 26] (Change) Change paragraph D to read:
D. Current in grounding conductor
Ground connection points shall be so arranged that under normal operating circumstances there will be no objectionable flow of current over the grounding conductor. If an objectionable flow of current occurs over a grounding conductor due to the use of multi-grounds, the following options may be used:
1. Determine the source of the objectionable ground conductor current and take action necessary to reduce the current to an acceptable level at its source.
2. Subject to the approval of the commission, other effective means may be used to limit the current, but no means employed shall create a situation of excessive voltage buildup on the neutral.
The system ground of the source transformer shall not be removed.
Under normal system conditions a grounding conductor current will be considered objectionable if the electrical or communications system’s owner or operator deems such current to be objectionable, or if the presence or electrical characteristics of the grounding conductor current is in violation of rules and regulations governing the electrical system, as set forth by the commission.
The temporary currents set up under abnormal conditions while grounding conductors are performing their intended protective functions are not considered objectionable. The conductor shall have the capability of conducting anticipated fault current without thermal overloading or excessive voltage buildup. Refer to Rule 93C.