PSC 114.232(1)(d) (d) Add the reference to Footnote 26 in NESC-2012 Table 232-1 on pp. 94-97 (Metric) and pp. 97-100 (Feet) to the sailboating category titles of rows 6 and 7. It applies to all clearances in those rows.
PSC 114.232(1)(e) (e) Add Footnote 27 which reads as follows:
27A diagonal clearance equal to the required vertical clearance shall be maintained to uneven or sloping terrain within a horizontal distance of 3/4 (75%) of the required vertical clearance. All distances shall be measured from the conductors in their wind-displaced position as defined in NESC Rule 234A2.
PSC 114.232(1)(f) (f) Add the reference to Footnote 27 in NESC-2012 Table 232-1 on pp. 94-97 (Metric) and pp. 97-100 (Feet) to the conductor category titles of columns 3, 4 and 5. It applies to all clearances in those columns.
PSC 114.232(2) (2)Table PSC 114.232-2. [NESC, Table 232-2, pp. 101-102 (metric) and pp. 102-103 (feet)] Vertical clearance of equipment cases, support arms, platforms, braces and unguarded rigid live parts above ground, roadway, or water surfaces (Change). Change Footnote 8 to read as follows:
8Where the US Army Corps of Engineers, or the state, or surrogate thereof has issued a crossing permit, the greater clearances of that permit or this code shall govern.
PSC 114.232(3) (3)Table PSC 114.232-3. [NESC, table 232-3, p. 104] Reference heights (Change). Change Footnote 3 to read:
3For controlled impoundments, the surface area and corresponding clearances shall be based upon the design high water mark. For other waters, the surface area and clearances shall be based on the ordinary high water mark. The clearance over rivers, streams, and canals shall be based upon the largest surface area of any 1.6-km-long (1 mi) segment which includes the crossing. The clearance over a canal, river or stream normally providing access for sailboats to a larger body of water shall be the same as that required for the larger body of water.
PSC 114.232 History History: 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 114.232 (title) under s. 13.92 (4) (b) 2., Stats., number (1) to (3) under s. 13.92 (b) (b) 1., Stats., Register March 2015 No. 711.
PSC 114.234 PSC 114.234Clearance of wires, conductors, cables, and equipment from buildings, bridges, rail cars, swimming pools, and other installations.
PSC 114.234(1) (1)Vertical and horizontal clearances. [NESC 234C1a, p. 118] (Change) Change paragraph (1) (a) to read:
(a) Clearances. Unguarded or accessible wires, conductors, cables, or rigid live parts may be located adjacent to buildings, signs, billboards, chimneys, radio and television antenna, tanks, flagpoles and flags, banners and other installations and any projections therefrom. The vertical and horizontal clearances of such rigid and nonrigid parts shall be not less than the values in Table 234-1 when at rest under the conditions specified in Rule 234A1.These facilities may be installed beside, over or under buildings, building projections and other installation, as illustrated in Figs. 234-1(a) and 234-1(b) and 234-1(c). Buildings, signs, billboards, chimneys, radio and television antennas, tanks, flagpoles and flags, banners and other installations and any projections therefrom shall not be located near existing wires, conductors, cables or rigid live parts if doing so results in clearances less than the values given in Table 234-1.
PSC 114.234(2) (2)Transmission lines over dwelling units. [Follows NESC 234C1b, p. 119] (Addition) Add the following paragraph c:
c. Transmission lines over dwelling units.
No utility may construct conductors of supply lines designed to operate at voltages in excess of 35 kV over any portion of a dwelling unit. This provision also applies to line conductors in their wind-displaced position as defined in Rule 234A2.
PSC 114.234 Note Note: It is the intent under s. SPS 316.225(6) that the public not construct any portion of a dwelling unit under such lines.
PSC 114.234 Note Note: The term “dwelling unit" has the meaning given in ch. SPS 316, which adopts by reference the definitions in NEC-2008.
PSC 114.234 Note Note: See s. SPS 316.225(6) Clearance Over Buildings and Other Structures, which refers to ch. PSC 114 regarding clearance of conductors over 600 volts and the prohibition of dwellings under or near overhead lines.
PSC 114.234(3) (3)Supply conductors attached to buildings or other installations. [NESC 234C3d, p.119] (Change) Change Exception 2(a) to read:
PSC 114.234 Note Exception 2(a): 2.45 m (8 feet). This clearance may be reduced to 0.90 m (3 ft) for supply conductors limited to 300 volts to ground and communication conductors and cables if the roof has a slope of not less than 1 (vertical) to 3 (horizontal).
PSC 114.234(4) (4)Clearance of lines near stored materials. [Follows NESC 234C5, p. 120] (Addition) Add the following paragraph 6 and note:
6. Clearance of Lines Near Stored Materials
Lines, under wind-displaced conditions stated in Rule 234A2, shall not be run over designated material storage areas where material is regularly stored and handled by cranes, dump trucks, elevators or other types of high machinery unless the clearance of such lines is adequate to permit full use of the equipment. Material which requires the use of such high machinery shall not be stored near or under existing lines.
PSC 114.234 Note Note: See NESC Rule 234F for Grain Bin clearances.
PSC 114.234(5) (5)Clearance of lines near fuel storage tanks. [Follows NESC 234C5, p. 120] (Addition) Add the following paragraph 7 and exceptions 1 and 2:
7. Clearance of Supply Lines Near Fuel Storage Tanks
Supply lines shall not be run over above-ground flammable liquids and liquefied petroleum gas (LPG) storage tanks. A horizontal clearance of not less than 2.45 m (8 ft) with cables at rest, and not less than 1.80 m (6 ft) with cables displaced by wind according to Rule 234A2, shall be maintained between above-ground flammable liquids and liquefied petroleum gas storage tanks and supply cables of all voltages meeting Rule 230C. A horizontal clearance of not less than 4.6 m (15 ft) with conductors at rest, and not less than 3.0 m (10 ft) with conductors displaced by wind according to Rule 234A2, shall be maintained between such fuel storage tanks and all other supply conductors.
PSC 114.234 Note Exception 1: These requirements do not apply to liquefied petroleum gas tanks with a capacity of 1,000 gallons or less.
PSC 114.234 Note Exception 2: These requirements do not apply to tanks enclosed in a building or fully covered by a roof or canopy capable of preventing falling overhead supply conductors from directly contacting the tank. In this case, the vertical and horizontal clearance requirements of conductors from buildings apply. See Rule 234C.
PSC 114.234(6) (6)Clearance of lines near wells. [Follows NESC 234C5, p. 120] (Addition) Add the following paragraph 8 and exception:
8. Clearance of Open Supply Lines Near Wells
Open supply lines shall not be run over wells. A horizontal clearance with conductors at rest of no less than 3/4 of the vertical clearance of the conductors to ground required by Rule 232, and a horizontal clearance of not less than 3.0 m (10 ft) with conductors displaced by wind according to Rule 234A2, shall be maintained between open supply conductors and wells. Persons installing such wells shall also comply with this requirement.
PSC 114.234 Note Exception: This rule does not apply to Groundwater Monitoring Wells defined in Wis. Admin. Code ch. NR 141 provided such wells are installed using hydraulic push methods, such as a Geoprobe type rig (The vertical clearance required for a Geoprobe is typically less than 10 feet.) and where sampling is accomplished using a bailer or a submersible pump attached to flexible tubing. This exception is not intended to apply to monitoring wells installed with drilling rigs that are taller than 14 feet or sampling methods that require sections of piping (steel or plastic pipe).
PSC 114.234(7) (7)Clearance of lines near antennas. [Follows NESC 234C5, p. 120] (Addition) Add the following paragraph heading 9 and note:
9. Clearance of lines near antennas
PSC 114.234 Note Note: Besides the applicable clearances of Rule 234C, additional requirements with respect to the proximity of antennas to power and communications lines are found in Wisconsin Building Code (Antenna Setback and Antenna Support, IBC Chapter 31, Sections 3108.1, 3108.2 and 3108.4).
PSC 114.234(8) (8)Swimming pools. [NESC 234E1, p. 121] (Addition) Add the following sentence to the beginning of paragraph E1:
1. Swimming Pools
Pools and appurtenances shall not be placed under or near existing service-drop conductors or any other overhead wiring; nor shall such wiring be installed over a swimming pool or the surrounding area unless such installation complies with the clearances or the exceptions specified in NESC Rule 234E1.
PSC 114.234(9) (9)Grain bins loaded by permanently installed augers, conveyers, or elevator systems. [Follows NESC 234F1, p. 122] (Addition) Add Exception and Note to read:
PSC 114.234 Note Exception: Farm silos that are loaded by a blower through a vertical metal tube permanently attached to the side of the structure are not considered grain bins.
PSC 114.234 Note Note: Typical cylindrical farm silos are considered buildings for the purposes of this code and the clearance requirements of NESC Rule 234C, as amended herein, would apply.
PSC 114.234(10) (10)Table PSC 114.234-l. [NESC Table 234-l, pp. 130-133 (metric) and pp. 134-137 (feet)] Clearance of wires, conductors, cables, and unguarded rigid live parts adjacent but not attached to buildings and other installations except bridges. (Changes, deletions and additions).
PSC 114.234(10)(a) (a) Table PSC ll4.234-l Metric contains the following changes and additions to NESC Table 234-1 Metric:
PSC 114.234(10)(a)1. 1. The value in Item (Row) 1.b.(1), Column 2 is revised from “0.90" to “2.45".
PSC 114.234(10)(a)2. 2. The value in Item (Row) 1.b.(1), Column 3 is revised from “1.07" to “2.45".
PSC 114.234(10)(a)3. 3. Add Footnote 17, which reads as follows:
17This clearance may be reduced to 0.90 m for supply conductors limited to 300 V to ground and communications conductors and cables if the roof has a slope of not less than 1 (vertical) to 3 (horizontal).
PSC 114.234(10)(a)4. 4. The reference to Footnote 17 is added to the values in Item (Row) 1.b.(1), Columns 2 and 3.
PSC 114.234(10)(b) (b) Table PSC 114.234-1 Feet contains the following changes, deletions and additions to NESC Table 234-1 Feet:
PSC 114.234(10)(b)1. 1. The value in Item (Row) 1.b.(1), Column 2 is revised from “3.0" to “8.0."
PSC 114.234(10)(b)2. 2. The value in Item (Row) 1.b.(1), Column 3 is revised from “3.5" to “8.0."
PSC 114.234(10)(b)3. 3. Add Footnote 17, which reads as follows:
17This clearance may be reduced to 3 ft for supply conductors limited to 300 V to ground and communications conductors and cables if the roof has a slope of not less than 1 (vertical) to 3 (horizontal).
PSC 114.234(10)(b)4. 4. The reference to Footnote 17 is added to the values in Item (Row) 1.b.(1), Columns 2 and 3.
PSC 114.234 History History: 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 114.234 (title) under s. 13.92 (4) (b) 2., Stats., renum. (1) to (10) from PSC 114.234C1a, 114.234C1c, 114.234C3d, 114.234C6, 114.234C7, 114.234C8, 114.234C9, 114.234E1, and 114.234F1 under s. 13.92 (4) (b) 2., Stats., Register March 2015 No. 711.
PSC 114.235 PSC 114.235Sag-related clearances. [Follows NESC 235C2b(1)(a) Exception 2, p. 150] (Change) Change Exception 2 to read:
Exception 2: For supply conductors of different utilities, vertical clearance at any point in the span need not exceed 75% of the values required at the supports for the same utility by Table 235-5.
PSC 114.235 History History: 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; renum. PSC 114.235 from PSC 114.235C2b(1)(a) under s. 13.92 (4) (b) 1., Stats., Register March 2015 No. 711.
Section 24. Grades of Construction
PSC 114.242 PSC 114.242Grades of construction for conductors. [Follows NESC 242F, p. 187] (Addition) Add the following paragraph G to read:
G. Circuits exceeding 175 kV to ground
Grade B construction shall always be used if the voltage exceeds 175 kV to ground.
PSC 114.242 History History: 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; renum. PSC 114.242 from PSC 114.242F under s. 13.92 (4) (b) 1., Stats., Register March 2015 No. 711.
Section 25. Loading for Grades B and C
PSC 114.250 PSC 114.250General loading requirements and maps.
PSC 114.250(1)(1)Extreme wind loading. [Alternative to NESC 250C, p. 191] As an alternate to NESC Tables 250-2 and Table 250-3, the following Table PSC 114.250-2 and the related definitions and formulas for kZ and GRF may be used. (NESC Figure 250-2(b) “Basic Wind Speeds" is a part of this rule by reference.)
C. Extreme wind loading
If no portion of a structure or its supported facilities exceeds 18 m (60 ft) above ground or water level, the provision of the rule are not required, except as specified in Rule 261A.1.2.f. Where a structure or its supported facilities exceeds 18 m (60 ft) above ground or water level, the structure and its supported facilities shall be designed to withstand the extreme wind load associated with the Base Wind Speed as specified by NESC Figure 250-2(b). The wind pressures calculated shall be applied to the entire structure and supported facilities without ice.
The following formula shall be used to calculate wind load.
Load in Newton = 0.613 (Vm/s) 2 kZ GRF I Cd A(m2)
Load in pounds = 0.00256 (Vmi/h) 2 kZ GRF I Cd A(ft2)
Table PSC 114.250-2 (Metric)
Velocity Pressure Exposure Coefficient, k
Z
Gust Response Factor, GRF - See PDF for table PDF
Table PSC 114.250-2 (English)
Velocity Pressure Exposure Coefficient, k
Z
Gust Response Factor, GRF - See PDF for table PDF
Where:
h = height of the structure above ground or water level. For wind loads on wires attached to the structure, the height of the highest wire attachment above ground or water level may be used if less than the height of the structure. In unique terrain where the height of the wire above ground at mid-span may be substantially higher than at the attachment point, engineering judgment may be used to determine an appropriate value the height of the wire.
PSC 114.250 Note Note: The height of all wire attachments should be based on the height of the highest attachment or total structure height. The formulas to determine kZÌGRF were based on this premise, not the height of each attachment.
The wind pressure parameters (kZ, V, and GRF) are based on open terrain with scattered obstructions (Exposure Category C as defined in ASCE 7-98). Exposure Category C is the basis of the NESC extreme wind criteria. Topographic features such as ridges, hills, and escarpments may increase the wind loads on site-specific structures. A topographic Factor, kzt, from ASCE7-98 may be used to account for these special cases.
PSC 114.250(2) (2)Longitudinal capability. [Follows NESC 250D, p. 193] (Addition) Add the following paragraph E:
E. Longitudinal capability
Each supply line designed to operate at 300 kV phase to phase or above shall be constructed to limit the effects of a cascading-type failure to a line segment not exceeding 9.6 km (6 mi) to 16 km (10 mi) in length. Such construction requirement may be met by providing, at appropriate intervals, structures and associated facilities having full dead-end capability under the loading provisions of Rules 250 A, B, C and D. Consideration shall be given to factors such as structure type and material, length of line, distance between dead-end or heavy angle structures, and other basic design criteria in determining the length of such individual line segments. For lines supported by “flexible" structures designed with plastic, energy-absorbing capability in failure, this requirement may be met if such design and construction will provide equivalent limitation to longitudinal cascading.
PSC 114.250 History History: 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 114.250 (title) under s. 13.92 (4) (b) 2., Stats., renum. (1) and (2) from PSC 114.250C and 114.250E under s. 13.92 (4) (b) 1., Stats., Register March 2015 No. 711.
PSC 114.253 PSC 114.253Load factors for structures, cross arms, support hardware, guys, foundations, and anchors. Table PSC 114.253-1 [NESC Table 253-1, p. 212] Load factors for structures1, crossarms, support hardware, guys, foundations, and anchors to be used with the strength factors of Table 261-1 (Changes)
PSC 114.253(1) (1) Change Footnote 2 to read:
2For guys and anchors associated with structures supporting communications conductors and cables only, this factor may be reduced to 1.33. For guys associated with structures supporting supply conductors or supply conductors and communications conductors and cables, this factor may be reduced to 1.5.
PSC 114.253(2) (2) Change Footnote 4 to read:
4For guys associated with structures supporting only supply conductors or supply conductors and communications conductors and cables, this factor may be reduced to 2.00. This factor may be reduced to 1.75 for wood and reinforced (not prestressed) concrete structures when the span being supported is not at a crossing.
PSC 114.253 History History: 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 114.253 (title) under s. 13.92 (4) (b) 2., Stats., renum. (1) and (2) from PSC 114.253-1 under s. 13.92 (4) (b) 1., Stats., Register March 2015 No. 711; correction in PSC 114.253 (title) under s. 13.92 (4) (b) 2., Stats., Register June 2015 No. 714.
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Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.