Wis. Admin. Code Public Service Commission PSC 114.092

Current through October 28, 2024

Section PSC 114.092 - Point of connection of grounding conductor

(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.

(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.

Wis. Admin. Code Public Service Commission PSC 114.092

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. PSC 114.092 (title) under s. 13.92 (4) (b) 2, Stats., renum. (1) and (2) from PSC 114.092B2b and 114.092D under s. 13.92 (4) (b) 1, Stats., Register March 2015 No. 711.

Amended by, CR 18-007: am. (title), (1) (intro.), (2) (intro.) Register February 2020 No. 770, eff. 3/1/2020

Some amount of current will always be present on the grounding conductors of an operating AC electrical system. That current may be conducted and/or induced and is not, in and of itself, objectionable.