HomeMy WebLinkAboutUndergrounding Doc from Tim FlemingNavigate the Energy Division Website
Navigate the CPUC Website
February 12, 2000
Find a Project or Issue Area
UNDERGROUNDING
R.00-01-005, Order Instituting RulemakinI g (OIR) into
Implementation of Assembly Bill 1149 on Undergrounding
. ORDER INSTITUTING RULEMAKING INTO IMPLEMENTATION OF
ASSEMBLY-BILL 1149 Download in PDF Format rndutles whMpaper 8
A61149)
. Workshop Notice for Workshop on February 10 -11, 2000 - PDF
o NOTICE CHANGING LOCATION OF %EtIEAAIkG.
CONFERENCE AND WORKSHOP - PDF
o Workshop Agenda - PDF
o Costs: Generic data request to Jurisdictional Utilities - PDF
rlu+anaa- Gnnnrie da+a ran,ma++n 1ur1arllr+1nna1 Il+ili+iec - PDF
Sect3 w w w • ~ i
35 Tree Trimming
70s1~
9s
Where overhead wires pass through trees, safety and reliability of service demand
that tree trimming be done in order that he wires may clear branches and foliage by
/
a reasonable distance. The minimum clearances established in Table 1, Case 13, ILL
measured between line conductors and vegetation under normal conditions, shall be
maintained (Also see Appendix E for tree trimming guidelines.)
When a utility has actual knowledge, obtained either through normal operating
practices or notification to the utility, dead, rotten and diseased trees or portions
thereof, that overhang or lean toward and may fall into a span, should be removed.
Communication and electric supply circuits, energized at 750 volts or less,
includingiheir serne drops, should be kept clearofliimbs and foliage, in new
construction and when circuits are reconstructed or repaired,.whenever practicable.
When a utility has actual knowledge, obtained either through normal operating
practices or notification to the utility, that any circuit energized at 750 volts or less
shows strain or evidences abrasion from tree contact, the condition shall be
corrected by slacking or rearranging the line, trimming the tree or placing
mechanical protection on the conductor(s).
EXCEPTIONS:
C~_ule 35 requirements do not apply to conductors, or aerial cable that complies
Z f` - th Rule 57.4-C, energized at less tip-6fi,00fPvolts, where-ttamning-or removal
u
. _ y his not practicable and the conductor is separated from the tree with suitable
L = materials or devices to avoid conductor damage by abrasion and grounding of the
circuit through the tree.
*2. Rule 35 requirements do not apply where the utility has made a "good faith"
c S~ r ` effort to obtain permission to trim or remove vegetation but permission was refused
'To I S 0 N /3 X41 _ or unobtainable. A "good faith" effort shall consist of current documentation of a
I S VEYC'~ l/J7e7?E~l mtmmum of an attempted personal contact and a written communication, including
i documentation of mailing or delivery. However, this does not preclude other action
~/J ELI S Of✓ S or actions from demonstrating "good faith". If permission to trim or remove
!Jfl/JI~Lt~✓G dF its
~ /J ~ ~ vegetation is unobtainable and requirements of exception 2 are met, the utility is
fr/./ T I T7 not compelled to comply with the requirements of exception 1.
S~ l~T li✓~U14YVi L-'7~. control of
S b S u e3 J S, he The Commission result in nonconformance a with he rules In uch cases, he utility
/Ui;GES Shy A may be directed by he Commission to take prompt remedial action to come into
U Y), RA"' N 1 confo*m? ce whethero not the nonconformance gives rise to penalties or is
EJ~ W DC e?) A alleged to fall within permitted exceptions or phase-in requirements.
I'L) C-0 .Note: Revised November 6,1992 by Resolution No. SU-15, September 20, 1996 by Decision No.
96-09-097 and January 23, 1997 by Decision No. 97-01-044.
y ~QwT
Rule 37 f
s/CSD/US g09 ect3.htm
5ect5
Rule 57
66 Messengers and Insulated Cables
66.1 Definition (See Rules 20.3 and 21.11)
66.2 Use of Messenger
Page I of 9
Where a cable is of such weight that it would not meet the safety
factors of Table 4 when self-supported, attachment to stranded
messenger shall be made for supporting said weight.
66.3 Material and Strength (See Rule 49.7)
66.4 Clearances
Basic minimum clearances for messengers and insulated cables
are specified in Rules 37 and 38, Tables 1 and 2 respectively and
shall be measured to the nearest surfaces of the cable and
messenger assembly, including cable rings and messenger
supports. The basic clearances specified for conductors, as
modified by provisions of Rule 54.4 are applicable to insulated
cables. These clearances for messengers and cables are also
subject to the following modifications. The clearances required
for supply conductors of 0 - 750 volts shall be applied to
suitably insulated cables of any voltage having a metallic sheath
which is bonded and grounded as specified in Rule 57.8.
A Above Ground
(1) Messengers and Insulated Cables: The basic clearances
specified in Rule 37, Table 1 for conductors, as modified by
provisions of Rule 54.4-A, are applicable to messengers and
insulated cables (See Rule 57.8).
(2) Grounded and Bonded Messengers and Insulated
Cables: The basic clearances specified in Rule 37, Table 1,
Column D, are applicable to grounded cables having metallic
sheaths, and to effectively grounded messengers (see Rule 57.8).
Note: Revised January 21, 1992, by Resolution SU-10.
B Above Railways and Trolley Lines
(1) Which Transport Freight Cars: The clearances specified in
Table 1, Case 1, Columns A, B, and D are based upon the
maximum height of standard freight cars, 15 feet 1 inch from the
http://www.cpuc.ca.gov/divisions/CSDIUSB/go95/Sect5.htm 2/2/00
Sects
Page 2 of 9
top of rail to top of running board. These clearances shall in no
case be reduced more than 5% because of temperature, wind or
mechanical loading.
Rule 57.4-F
(2) Operated by Overhead Trolley: The clearances specified in
Table 1, Case 2, Columns A and D, 26 feet and 27 feet
respectively, are based upon a maximum trolley pole throw of 26
feet, the usual maximum height of a free trolley pole above the
top of rails or surface of streets used by trolley cars or coaches.
EXCEPTION: Messengers, and cables, which are bonded and
grounded as specified in Rule 57.8, may have clearances above
the rails or surface of streets used by trolley cars or coaches less
than the distance specified in Table 1, Case 2, Columns A and D
for trolley-throw clearance, provided the messengers and cables
are not less than 4 feet above the trolley contact conductor and
are encased in wood boxing or moulding with a minimum
thickness of 7/8 inch (or other suitable material having the same
minimum electrical insulating qualities and mechanical strength)
for distances of at least 2 feet horizontally from the vertical
plane through each trolley contact conductor.
Note: Revised January 21, 1992, by Resolution SU-10.
C Between Conductors in Cables
No specified clearance is required between the individual
conductors of suitably insulated cables, whether single or
grouped, and therefore the clearances specified in Table 2, Cases
15, 16 and 17 do not apply between such conductors. Any such
multiple-conductor group shall be treated as a single conductor
in the application of other clearance requirements.
D Between Cables and Messengers
Cables supported by messengers are not required to be any
specified distance from their supporting messengers.
E Between Messengers
The clearance specified in Table 2, Case 1, Column A does not
apply and no clearance is required where messengers of the same
electrical system branch or cross.
F From Poles, Crossarms and Other Conductors
http://www.cpuc.ca.gov/divisions/CSDIUSB/go95/Sect5.htxn 2/2/00
Sects Page 3 of 9
Messengers, and metal sheathed cables, which are bonded and
grounded as specified in Rule 57.8 shall have clearances not less
than the minimum clearances required for conductors of 0 - 750
volts with all of the following provisions being applicable:
Rule 57.4-F1
(1) Attached to Surfaces of Poles and Crossarms: Such
grounded messengers and cables may be attached to the surfaces
of poles or crossarms at less than the clearance specified in
Table 1. Column D, Cases 8 and 9. When attached to pole or
crossarm at less than 15 inches from centerline of pole such
grounded messenger or cable shall not be less than 4 feet
vertically above or 6 feet vertically below any unprotected
supply conductor except that where a guard arm (or arms) is
placed above messenger and cable as specified in Rule 57.7, the
clearance of 6 feet may be reduced to not less than 4 feet below
unprotected conductors of 0 - 750 volts (see Figure 57-1 A).
(2) Supported on Same Crossarm above 750 Volts: Such
grounded messenger and cable when supported on the same
crossarm with unprotected conductors in excess of 750 volts
shall be placedon_the side of pole_oppositf-the unprotected
conductors (see Figure 57-113).
(3) Supported on Same Crossarm 0 - 750 Volts: Such
grounded messenger and cable when supported on the same
crossarm with unprotected conductors of 0 - 750 volts, shall be
placed at not less than pin spacing (Table 2, Case 15, Column D)
beyond the outermost unprotected conductor on the same side
of pole (see Figure 57-1 Q.
(4) Between Cable and Unprotected Conductors: The
clearances between a cable and unprotected conductors shall not
be held to apply between a grounded cable (and its messenger)
and unprotected conductors of the same circuit on poles where
unprotected conductors enter (or leave) a cable. On such poles
no grounded section of messenger or cable shall be less than 15
inches from surface of pole.
(5) Two or More Cables Attached to the Surface of Pole:
Where two or more cables are attached to the surface of the
same wood pole they. shall be placed on the same side of pole
when their vertical separation is less than 8 feet but in no case
shall the vertical separation be less than 1 foot.
Note: Revised January 21, 1992, by Resolution SU-10.
http://www.cpuc.ca.gov/divisions/CSD/USB/go95/Sect5.htm 2/2/00
Sects Page 4 of 9
Rule 57.4-F1
http://www.cpuc.ca.gov/divisions/CSD/USB/go95/Sect5.htm 2/2/00
Sects
Rule 57.4-F
IF
D
4 Min.
With Guard Arm
9 Min.
Without Guard Arm
R
Cable Treated As
In Rule 57.8
r.
15' Min.
I
AiI n.
oil. I-
P
rd
R
`
Alternate Location
If No Unprotected
Conductor On Same
End Of Arm.
1
Figure 57-1
Supply Cables
Cables Treated As
In Rule 57.8
In.
http://www.cpuc.ca.gov/divisions/CSD/USB/go95/Sect5.htm
See Rule 32.4A3
Page 5 of 9
2/2/00
Sects
Rule 57.4-G
G From Buildings and Other Structures
Page 6 of 9
Messengers, and metal sheathed cables, which are bonded and
grounded as specified in Rule 57.8 are not required to clear
buildings and other structures any specified horizontal distance
and the clearance specified in Table 1, Case 7, Column D does
not apply in such instances. Such cables, and messengers, shall
be installed so that they do not interfere with the free use of fire
escapes, exits, etc., and should be arranged so as not to hamper
or endanger workers and firefighters while performing their
duties.
Note: Revised January 21, 1992. by Resolution SU-10.
H From Nonclimbable Street Lighting or Traffic Signal Poles or
Standards
Messengers and metal-sheathed cables which are bonded and
grounded as specified in Rule 57.8, passing (unattached)
nonclimbable street lighting and traffic signal poles or standards,
including ma ttarms, brackets, and lighting fixtures may have a
clearance less than the 36 inches specified in Table 1, Case 10,
Column D, but shall have a clearance of not less than 15 inches,
except when the conductors are mechanically protected from
abrasion by materials specified in Rule 22.2. Such mechanical
protections shall extend not less than 15 inches in each direction
along the cable from centerline of pole, standard, attaching
mastarut or fixture, whether passing above, below or alongside.
The conductors shall be installed in such a manner so as not to
interfere with light distribution from lighting fixtures and shall
not hamper workmen changing lamps or maintaining equipment.
Note: Added January 8, 1980 by Decision No. 91186 and revised March 9, 1988 by Resolution E-
3076.
66.5 Fastenings
Hardware used in connection with messengers shall meet the
strength requirement of Rule 49:7-C. Dead-end attachments
used on messengers or reinforced cables shall have a strength
not less than that of the messenger or reinforced cable.
Note: Revised January 21, 1992, by Resolution SU-10.
66.6 Sectionalizing of Messengers with Insulators
http://www.cpuc.ca.gov/divisions/CSDIUSB/go95/Sect5.htm 2/2/00
Sects
Page 7 of 9
The grounding of an extended messenger, as specified in Rule
57.8, is not required provided such extended messenger is
sectionalized as a guy by means of insulators.
Rule 57.7-A1
66.7 Use of Guard Arms and Coverings
Any guard arm which is required to be installed by the
provisions of Rule 57.4-F shall be at least 4 feet in length (Rule
20.9-D) and parallel to and not more than 4 inches above the top
of the cable or messenger. In lieu of the guard arm, suitable
protective covering (Rule 22.2) at least 4 feet in length may be
placed around the cable and messenger.
Double euard arms shall be used where such a messenger or
cable is dead ended on or wrapped around a wood pole, at a
vertical separation of less than 6 feet below unprotected supply
conductors of other circuits of 750 volts or less. Portions of
cables which take the form of a riser or a grounded lateral or
vertical run shall be covered as specified in Rule 54.6-E for
risers.
Note: Revised January 21, 1992, by Resolution SU-10.
66.8 Bonding and Grounding
The provisions of Rules 57.4, 57.6 and 57.7 for grounded
cables, and grounded messengers are applicable only to cables
having metallic sheaths, and to messengers, which are effectively
grounded at both ends of each run and at intermediate points not
exceeding 800 feet apart. Where such a metal sheathed cable is
supported on a messenger, each section of cable between splices
shall be permanently bonded to the messenger at not less than
two locations.
Cables not bonded and grounded as specified above shall
conform to the requirements of unprotected supply conductors
with the modifications provided in the several parts of Rule 57.
66.9 Sags
The sags of messengers which support cables shall be such that
under the maximum loading conditions the tensions in the
messengers shall not exceed the safe working stresses specified
in Rule 49.7-B.
http://www.cpuc.ca.gov/divisions/CSD/USB/go95/Sect5.htm 2/2/00
Sect5
67 Miscellaneous Equipment
Page x of 9
67.1 Enclosed Equipment (Transformers, Capacitors, Regulators, etc.)
A Position on Pole
(1) Multiple Units: Where more than one unit is installed on a
pole, they shall be placed on the same side of the pole.
http://www.cpuc.ca.gov/divisions/CSD/USB/go95/Sect5.htm 2/2/00