electrical service line standards - Doyon Utilities

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SPECIFICATIONS
All pages after Cover Sheet
Date in footer: “2014” changed to “2015”
TABLE OF CONTENTS
Page 1 INTRODUCTION

TABLE OF CONTENTS

1.1 SERVICE NAMING CONVENTION ............................................................................................... 3
1.2 TYPICAL PERMANENT OVERHEAD SERVICE, TYPE A (NOT TO EXCEED 200 AMPS) .......... 5
1.3 TYPICAL PERMANENT OVERHEAD SERVICE, TYPE B (NOT TO EXCEED 200 AMPS) ......... 9
1.4 TYPICAL PERMANENT UNDERGROUND SERVICE (NOT TO EXCEED 200 AMPS) ............. 16
1.5 TYPICAL MULTIPLE METER SERVICE ENTRANCE (SIX UNITS OR LESS) ............................ 19
1.6 TYPICAL MULTIPLE METER SERVICE ENTRANCE (MORE THAN SIX UNITS) ................ 24
1.7 TYPICAL CT METERED SERVICE (1000 AMPS OR BELOW) .................................................. 28
1.8 TYPICAL CT METERED SERVICE (GREATER THAN 1000A) .................................................. 35
1.8.1 NEW CONSTRUCTION: ...................................................................................................... 35
1.10 PRIMARY METERING ................................................................................................................ 36
SECTION 2 METERING AND SERVICE RELATED STANDARDS AND DETAILS .............................................. 39
2.1 SELFCONTAINED METER SOCKETS (100 AND 200 AMPS) ................................................. 39
2.2. CURRENT TRANSFORMER METER SOCKET ........................................................................... 39
2.3 GROUNDING ............................................................................................................................... 43
2.5 GUYING DETAILS ....................................................................................................................... 46
2.6 TRANSFORMER IMPEDANCE VALUES .................................................................................... 49
SECTION 3 – SERVICE APPLICATION CHECKLIST AND FORMS ..................................................................... 51
3.1 LOAD AND PRINT INFORMATION REQUIRED BY DU ............................................................ 53

2015 1 Doyon Utilities, LCC

INTRODUCTION Doyon Utilities (DU) standards of construction shall be utilized for all facilities to be owned, operated and maintained by the utility, to include hookups from the utility facility to the demarcation point. Generally, utility mains/distribution lines will be constructed by DU or by DU's contractor at DU expense. Thus, these standards will be followed by DU contractors. DU will be responsible for planning, designing and constructing utility water, wastewater, gas, heat mains and electrical distribution system improvements for new government facilities. This will require close cooperation and utility involvement in the government facility planning process. Without this coordination, facilities constructed will have no utility service. The government, Army, or Corps of Engineers will not be responsible for design, construction, or oversight of any utility owned facilities, whether main/distribution, lines, or hookups. Doyon Utilities will be responsible for construction of the hookup for the utility from the building to the utility main/electrical distribution system facility as described below:
Electric: The electric hookup will be from the transformer to the load side of the disconnect. The utility will provide and install the meter. At a minimum for overhead services, Doyon Utilities will install the overhead service drop from the transformer to the service entrance mast. At a minimum for underground services, Doyon Utilities will install the service lateral from the transformer to the service side of the first (main) disconnect.
In most installations, Doyon will provide and install the service equipment up to and including the first (main) disconnect. However, in rare circumstances (with prior written approval of the utility), the facility contractor may be tasked with installation of the service entrance equipment at DU expense, including but not limited to meter base, CT enclosure, main disconnect, service entrance grounding, shunt trip devices, and mast/service entrance conduits. Regardless of installation, Doyon Utilities will own, operate and maintain the service hookup from the service transformer up to and including the first disconnect downstream of the transformer, which is the service point of demarcation. Regardless of the installer, the service entrance equipment shall be installed in accordance with these Electrical Service Line Standards as well as applicable local, military, and national codes. To ensure equipment quality and to decrease the likelihood that the facility contractor will be required to replace newly installed equipment (at contractor expense) prior to electric hookup, all service equipment must be approved by DU via the submittal review process before installation. When service equipment is provided by DU, coordination will be necessary so that the appropriate meters and equipment are on hand for the facilities to be constructed.
DESIGN AND CONSTRUCTION STANDARDS ELECTRICAL SERVICE LINE

For new services or service upgrades, a completed Service Application including a request for service coversheet, all DU required load and print information and the appropriate Electric Service Checklist is required before work will begin by DU to provide service. See Pages 5158 of these Standards for samples of these forms. The conductor size and material that the customer intends to land on the Doyon’s disconnect is imperative to include on the Coversheet, this allows DU to provide the appropriate provisions for the customer to terminate their conductors. Without this information, the customer may be responsible to pay for the additional costs incurred to change out the loadside lugs. After receipt of paperwork and a site inspection has been completed, if DU determines that any of the customer’s electrical installation doesn’t meet all pertinent current electrical codes, they have the option to refuse service until such time code violations are rectified. Although Doyon will be responsible for installation of service equipment up to and including the main disconnect, Doyon Utilities is not responsible for correctly sizing the service entrance equipment and conductors in accordance with the NEC, including the grounding electrode conductor. The facility designer will be responsible for correctly designing those items and submitting the required sizes to Doyon with the Service Application. Doyon will size the service equipment, conductors and main breakers in accordance with the information provided on the Service Application. Doyon can supply customers with the following secondary voltages for both overhead and underground:
1. Single Phase, 120/240V, 3 wire 2. Single Phase, 240/480V, 3 wire 3. Three Phase, 120/208V, 4 wire* 4. Three Phase, 277/480V, 4 wire*
If a secondary voltage other than the above is required, contact DU. Three Phase service may not be available to all locations, DU will advise of the additional costs associated with providing three phase service where there is currently only single phase available.

SECTION 1 ELECTRICAL SERVICE STANDARDS 1.1 SERVICE NAMING CONVENTION

SS refers to Service Standard and is the first two letters of all service types.
AA refers to the service amperage rating and indicates hundreds of amperes of the
service rating, i.e SS01 would be for a 100 Amp Service, and SS12 would indicate a
1200 Amp Service.
B refers to the voltage of the service based on a numbering code, where 1=240/120V,
2=208/120V, 3=480/240V, and 4=480/277V
C refers to type of service entrance feed type, T=Top Feed (Overhead) and B=Bottom
Feed (Underground)
D is only applicable for Top Feed Services and refers to the style of deadending the
overhead service drop, where H=House Knob and M=Mast type deadending.
So, for example, a 200 Amp, overhead, 1phase 240/120V service on the gable end of building where the mast does not penetrate the roof would be indicated by SS021TH. A 600 Amp, underground, 3phase 480/277V service would be indicated by SS064B Additional suffixes may be added to the service name to indicate additional features, like –G indicates group metering service entrance and GM indicates a group metering installation with an overall main disconnect.

1.2 TYPICAL PERMANENT OVERHEAD SERVICE, TYPE A (NOT TO EXCEED 200 AMPS) 1. Refer to detail SSAABTM schematic and material lists (pages 59)
2. Service Entrance Conductor shall extend out of the weather head a minimum of 18”.
3. Conductors shall be phased taped using the following convention: 120/240:Black/Red,
240/480:Brown/Orange, 120/208:Black/Red/Blue, and 277/480: Brown/Orange/Yellow
4. All service entrance masts that extend above the roof line shall be a minimum 2" rigid
metal conduit (RMC) or intermediate metal conduit (IMC) and shall be guyed using
minimum 1/8" aircraft cable and approved clamp. See Roof Guy Detail on page 47.
5. If roof overhang is less than 2 feet, provide suitable protection for meter from ice and
snow. Protection by overhanging roof is preferred. An acceptable alternative is a protective
hood made of 18 gauge (minimum) galvanized steel, fastened at the roof edge or wall, and
extending out a minimum of 6" beyond face of meter and 6" on each side of the service
equipment.
7. Couplings in the conduit shall be below roof line.
8. Telephone drop may not be attached to mast. See NEC 230.28.
9. Meter base shall be able to handle a ringtype meter, with test bypass. Ringless are not
acceptable.
10. Meter base shall be per the material call out or approved equal.
11. Locking provisions shall be factory installed, no field installed or modified locking provisions
are acceptable.
12. Contractors shall provide and maintain a minimum 4 ft. wide clearing between service
entrance and the Doyon Utilities pole.
13. Utility service drop is limited to a maximum 150' span.
14. See NEC 230.24 for required clearances over roof. If Army requirements call for vertical
clearance of service drop conductors to be greater than 3 ft. or a flat roof is classified as
accessible, then the mast assembly and guying will be designed by a qualified engineer.
Mast designs shall be submitted to the Doyon Utilities Engineering Services Department for
review prior to installation.
15. Conductor insulation shall be type XHHW2.
16. Maintain all NEC required clearance at all times. See NEC 230.9 and 230.24.
17. lf the grounding electrode conductor is exposed to physical damage it shall be run in
conduit securely fastened to the structure. See NEC 250.64(B).
18. Install sealing lock nuts or hubs on all conduit penetrations of outdoor enclosures.
19. Install intersystem bonding termination per NEC 250.94. Doyon doesn’t allow the use of
the NEC exceptions under this rule in any circumstance.
20. AIC Ratings of Specified Equipment are 10K AIC, except for 200 Amp, 480V Service, which
are 22K AIC. If Engineer determines higher ratings are required, adjust equipment callouts
accordingly.

1.3 TYPICAL PERMANENT OVERHEAD SERVICE, TYPE B (NOT TO EXCEED 200 AMPS)
1. Refer to detail SSAABTH schematic and material lists (pages 1115)
2. Service drop conductors shall be above or at least 36" from any door, opening window,
building vent, or other building opening.
3. Service Entrance Conductor shall extend out of the weather head a minimum of 18”.
4. Conductors shall be phased taped using the following convention: 120/240:Black/Red,
240/480: Brown/Orange, 120/208: Black/Red/Blue, and 277/480: Brown/Orange/Yellow
5. The use of splitbolts is not allowed.
6. Telephone drop shall be more than 12" (vertical clearance) below power cable at all points.
See NESC 235C1, Exception 3.
7. Conductor insulation shall be type XHHW2.
8. If the grounding electrode conductor is exposed to physical damage it shall be run in conduit
securely fastened to the structure. See NEC 250.64(B).
10. Meter base shall be able to handle a ringtype meter, with test bypass. Ring less aren’t
acceptable.
11. Meter base shall be per the material call out or approved equal.
12. Locking provisions shall be factory installed, no field installed or modified locking provisions
are acceptable.
13. Contractors shall provide and maintain a minimum 4 ft. wide clearing between Service
entrance and the Doyon Utilities pole.
14. Utility service drop is limited to a maximum 150' span.
15. Maintain all NEC required clearance at all times. See NEC 230.9 and 230.24.
16. Install intersystem bonding termination per NEC 250.94. Doyon doesn’t allow the use of the
NEC exceptions under this rule in any circumstance.
accordingly.

200 AMPS)
1. Refer to detail SSAABB schematic and material lists (pages 1719)
2. Service entrance location shall be approved by DU and shall be located as close as possible
to existing DU facilities.
3. Conduit for service cable shall be sized per NEC but shall not be less than 2 inches.
4. The Army Facilities' service equipment shall conform to the NEC and State of Alaska Codes
and shall be inspected and approved prior to connection of service by DU.
5. Any deviation from this standard shall be approved in writing by DU's Engineers.
6. If grounding electrode conductor is exposed to physical damage it shall be run in conduit
7. Equipment shall be mounted so that center of meter is located at height of 5’0” minimum
and 6’0” maximum above grade.
9. Service Lateral Conductors shall be phased taped using the following convention:
120/240:Black/Red, 240/480:Brown/Orange, 120/208: Black/Red/Blue, and 277/480:
Brown/Orange/Yellow
accordingly.

1.5 TYPICAL MULTIPLE METER SERVICE ENTRANCE (SIX UNITS OR LESS)
1. Refer to detail SS04BBG schematic and material lists (pages 2123)
7. The bottom of the service entrance equipment shall not be less than 36" above finished
grade or finished floor. Choose equipment size to maintain this minimum distance and
maximum height of 6'7" to the horizontal centerline of the highest breaker or handle of the
disconnecting means.
Brown/Orange/Yellow
11. Coordinate additional requirements with DU if overhead service is desired for this type of
installation.
12. AIC Ratings of Specified Equipment are 10K AIC. If Engineer determines higher ratings are
required, adjust equipment circuit breaker callouts accordingly.


1.6 TYPICAL MULTIPLE METER SERVICE ENTRANCE (MORE THAN SIX UNITS)
1. Refer to detail SSAABBGM schematic and material lists (pages 2527)
4. The Army facilities' equipment shall conform to the NEC and State of Alaska Codes and shall
be inspected and approved prior to connection of service by DU.
6. The bottom of the service entrance equipment shall not be less than 36" above finished
grad or finished floor. Choose equipment size to maintain this minimum distance and
maximum height of 6'7' to the horizontal centerline of the highest breaker or handle of the
disconnecting means.
Brown/Orange/Yellow.
10. AIC Ratings of Specified Equipment are 10K AIC. If Engineer determines higher ratings are
required, adjust equipment circuit breaker callouts accordingly.


1.7 TYPICAL CT METERED SERVICE (1000 AMPS OR BELOW)
1. Refer to detail SSAABB schematic and material lists (pages 2934)
2. The maximum ampacity of a new overhead service shall be limited to 200 Amps without
special permission from Doyon Utilities. If a service greater than 200 Amps is required than
it will be served by an underground connection.
6. CT cabinet, meter enclosure, and main disconnect(s) shall be grouped together on the
outside of building. All enclosures shall be raintight (NEMA 3R). Inside locations are not
permitted without written Doyon approval prior to installation.
7. Conduit for conductors between CT’s and Meter shall be at least 1 inch diameter and no
longer than 30 feet. Conduit shall be GRS. Conduit used for CT circuits shall be of the
threaded type.
8. CT's shall be mounted at right angles to enclosure panels with polarity marks facing source
side.
9. DU shall install CT secondary wiring and test switch.
12. Conductor insulation shall be type XHHW2 for conduit installations.
Brown/Orange/Yellow
15. AIC Ratings of Specified Equipment are 65K AIC for 120/208V services, 35K AIC for 400
Ampere and 600 Ampere 277/480V services, and 50K AIC for 800 Ampere and 1200 Ampere
277/480V services. If Engineer determines higher ratings are required, adjust equipment
callouts accordingly.

1.8.1 NEW CONSTRUCTION:
Ft. Wainwright and Ft. Greely: At the time of design of a new service greater than 1000A, Doyon shall be notified. It is the intent of Doyon to append a metering and main breaker section or sections to the Building MDP and have it integrated into the MDP from the MDP manufacturer. Doyon will provide the contractor procuring the MDP with their requirements and reimburse the facility contractor for the cost adder of the additional Doyon sections. Coordination with Doyon Utilities during the facility design process will be required. The following minimum requirements shall be met for these installations:
1. Adequate interior working space shall be provided for the interior installation.
Refer to the interior Doyon service equipment working space detail (page 37)
for minimum requirements.
2. The metering and CT section of the MDP shall be built to EUSERC standards for
the ampacity and voltage of the service size. The CT section shall include
removable bus sections to accommodate window type CT’s appropriate for the
ampacity of the switchgear.
3. The main breaker shall include a shunt trip module for connection to exterior
located shunt trip knife switch. The MDP shall also include a 15A, 1 pole breaker
to power the shunt trip circuit. At Doyon’s discretion and expense, they may
request the facility electrical contractor install the shunt trip circuit and shunt
trip disconnect on the exterior of the building. See pages 36, 38 and 39 for
shunt trip requirements and details.
4. CT meterbases for these installations shall be installed on exterior of building
and accessible to DU employees. The conduit for conductors between CT’s and
Meter shall be installed by the facility electrical contractor, and shall be at least
1 inch diameter and no longer than 30 feet. Conduit shall be RMC.
5. In locations where an exterior CT meterbase is not feasible or cannot meet the
requirements of item 4, written acceptance of an interior meter location from
DU is required. In such instances, the installation shall include installation of a
1” RMC from the meter location to a DU accepted location on exterior of the
building to accommodate installation of a remote meter reading antenna on the
exterior of the building.
6. The service equipment shall conform to the NEC and State of Alaska Codes and
shall be inspected and approved prior to connection of service by DU.
7. DU employees shall have access to service equipment installed indoors in
facilities at all times.

JBER Richardson: At the time of design of a new service greater than 1000A, Doyon shall be notified. It is the intent of Doyon to supply a metering and main breaker/disconnect section on the exterior of the building. Only with Doyon’s written approval shall any of their equipment be located inside. Such interior installations shall meet the requirements noted above.
1.8.2 RENOVATION/UPGRADES:
Ft. Wainwright and Ft. Greely: At these above posts, the first choice is to modify existing installation to add a metering and main breaker section. It is imperative to contact Doyon Utilities at the time of planning to determine the feasibility of this retrofit. If an interior retrofit isn’t possible, DU will install their equipment on the exterior. In the case where exterior mounting is chosen, DU will reimburse the Army for the work required to reconnect the new service equipment to the existing equipment within the building. JBER Richardson: At Richardson any electrical service renovation work will include relocating the service equipment outside if applicable. DU will reimburse the Army for the work required to reconnect the new service equipment to the existing equipment within the building.
1.9 SHUNT TRIP REQUIREMENTS A minimum 8” x 8” Red Placard with White Letters shall be installed at each Shunt Trip location. The Placard shall read “Service Shunt Trip Utility”. In the case of multiple shunt trips for the same building, the placard shall also indicate specifically which room the main breaker is located in and the panel voltage it controls. The shunt trip switch shall be of the safety switch style and disconnect the main breaker in the off position. Handle shall be lockable in the ON and OFF position. See Shunt Trip details on page 38.


SECTION 2 METERING AND SERVICE RELATED STANDARDS AND DETAILS
2.1 SELFCONTAINED METER SOCKETS (100 AND 200 AMPS)
1. Manual bypass sockets are not allowed unless specifically approved by DU prior to
installation; all meter bases shall be of the Test Block Bypass style.
2. As required by NEC 110.15 the phase conductor in the service entrance having the higher
voltage to ground shall be identified by the color ORANGE, and be located on the right hand
lug of the meter base (4wire delta only).

2.2. CURRENT TRANSFORMER METER SOCKET
1. Meter base enclosure for any of the above metering configurations shall include provisions
for a DU provided test switch. The maximum distance between the meterbase and CT’s
shall be 30’ assuming the use of #10 CU XHHW2. In applications where this distance will be
exceeded, contact DU to determine if the actual distance is acceptable, given the exact CT’s
and conductor that will be used on the project.
2. Unless specific variance is granted by DU, DU shall provide and install the meterbase, CTs
and test switch, including wiring.
3. As required by NEC 110.15, the phase conductor in the service entrance having the higher
voltage to ground shall be identified by the color ORANGE, and be located on the right hand
lug of the meter base. (4wire delta only).
4. If the test switch doesn’t have built in capabilities of shunting the neutral wires together,
this shall be done.
5. Individual wires between the X2 on each CT and each test switch phase neutral is required.
One wire between the test switch and CT cabinet isn’t allowed.
6. Depending on the manufacture of the test switch, the X1 and X2 locations may be swapped
from detail. The X1 position(hot) identified by determining which switch has the shorting
fingers. At the time of this writing, the wiring diagram shows a Millbank style test switch
with X1 on the left. Cooper BLine’s normal standard is the exact opposite; however, they
are intending to provide Doyon with test switches that conform to the same standard as


2.3 GROUNDING
1. Bond grounding electrode conductor to metal water pipe and other available grounding
electrodes as required by NEC 250.50 “Grounding Electrode System”.
2. If grounding requirements of NEC 250.50 cannot be met, and made electrodes are utilized
as the sole type of grounding electrodes, then the resistance requirements of NEC 250.56
shall be met. Electrodes may be directly bonded together with grounding electrode
conductor, individually routed to the neutral bus, or connected to an optional terminal bus
as stated in item 12. A ground rod is required by DU even if a metal water pipe or other
electrodes listed in NEC 250.50 are used.
3. For new construction, it is the responsibility of the facility electrical contractor to provide
and install the grounding electrode conductors and bonding, sized and installed in
accordance with the requirements of NEC article 250, for each of the available electrodes of
the building listed in NEC 250.52. Sufficient additional conductor shall be left coiled at the
service entrance to allow connection to the service entrance ground bus without splicing the
conductor. Auxiliary grounding electrodes (ground rods) at the service entrance shall be
installed by DU or DU’s contractor.
4. Supply side equipment bonding jumper shall be sized in accordance to NEC 250.102(C) with
minimum size to be #4 CU as required by DU. Equipment bonding jumper shall be
continuous throughout service equipment.
5. Grounding electrode conductors sized in accordance to NEC 250.66 with minimum size to be
#4 CU in accordance with DU requirements. For specific service entrance, see approved DU
load data for minimum permissible grounding electrode conductor size. See item 12 for
another grounding electrode bonding jumper connection option. Grounding conductors
shall be continuous as per NEC 250.64(C) and protection from physical damage as per NEC
250.64(B).
6. Use #4 CU conductors to bond CT meter enclosure. CT meter bonding conductor shall be
continuous between bonding points.
7. All neutral buses shall be either directly or indirectly effectively bonded to enclosures in
accordance with NEC 250.92. Install separate grounding lug in enclosure if neutral bus is not
directly bonded to enclosure. Factory supplied neutral bus bonding means are subject to
approval.
8. Per NEC 250.12 and 250.96, paint shall be removed from surfaces in contact with grounding
fittings. Exposed metal at ground points shall be protected with conductive corrosion
inhibitor.
9. Equipment bonding jumpers and CT meter bonding conductor shall be routed through the
conduit. Each end of the conduit shall be bonded as required by DU.
10. Threadless couplings and connectors are not allowed for bonding service equipment. OZ
Gedney Type CHMT or similar UL listed with piercing screw approved for bonding are

acceptable for bonding bushings. Standard locknuts or sealing locknuts are not acceptable
for bonding at service equipment.
11. Compression or screwtype connectors are acceptable means of splicing conductors. Split
bolt type are not allowed.
12. Optional terminal bus can be added to connect bonding jumpers form multiple grounding
electrodes. Optional terminal bus shall be effectively bonded to enclosure. A grounding
electrode conductor shall connect the optional bus with the neutral bus and it shall be sized
as per NEC 250.66.
14. At all newly constructed facilities with concrete foundations, it is the facility contractor’s
responsibility to install an appropriate concrete encased grounding electrode per NEC
250.52A(3). The facility contractor shall also install a copper grounding electrode conductor
from the concrete encased electrode to the service entrance equipment location for
connection to the service grounding electrode system. That grounding electrode conductor
shall be sized in accordance with NEC 250.66.


2.4 METERING/SERVICE EQUIPMENT LOCATION REQUIREMENTS
1. Whenever possible, metering and service equipment shall be installed nearest Doyon’s
primary facilities to minimize the extension of the required primary system. Coordinate
with Doyon Utilities during facility design to determine optimal location for metering and
service equipment.
2. For services less than 1200A at Ft. Wainwright and Ft. Greely, metering and service
equipment shall be located on the exterior of the building unless Doyon provides written
consent that the location may be on the interior. At JBER Richardson, any variance from
locating the metering and service equipment on the exterior requires written consent.
3. At locations that require multiple metered services, all equipment shall be grouped
together.
4. Metering and service equipment shall be readily accessible to Doyon at all times and not in a
locked location, unless Doyon has granted permission to the contrary.
5. Metering and service equipment shall be located in a safe, non hazardous, above ground
location that is free from mechanical damage including falling snow and ice.
6. Metering and service equipment shall be mounted on a rigid surface, with an attachment
system capable of securing the full weight of the equipment in accordance with applicable
codes and standards.
7. Metering and service equipment shall be located so to allow a minimum of 5’ working space
around the equipment without any obstacles.
8. Metering equipment shall be mounted such that the meter is at a height between 60” and
72” above final grade, with a desired height of 66”. In the case of multiple meters, the
equipment shall be centered at 66” whenever possible, while still maintaining a maximum
height of 72”. The preferred location of the center of the disconnect(s) is 66”, where there
are multiple disconnects, the middle of the uppermost disconnect(s) handle shall not be
greater than 79”.

1. See page 47 for service mast guying details.
2. No other attachments are permitted on the mast.
3. For mast heights greater than 60” contact DU. Mast designs shall be submitted to DU’s
Engineers for review and approval prior to installation.



2.6 TRANSFORMER IMPEDANCE VALUES The table below shows the assumed % impedance and phase angle for distribution transformers on the transformer base. Where fault current involves on onehalf of the low voltage winding, the % impedance values, based on full rated kVA, are 1.5 and 1.2 times the full winding %R and %X respectively. An infinite bus is assumed on high side of the transformer. If a overhead transformer bank is feeding the service, the %Z that shall be used in fault calculations is the %Z for one of the OH transformers. EX: 112.5kVA(337.5kVA) bank is feeding service, use %Z of 1.6.
Distribution Transformer Size [kVA/Phase]
7502000 5.75 60 2.875 + j4.980


Doyon Utilities, LLC WO# (for Doyon’s Use)
COVER SHEET ELECTRICAL LOAD DATA AND ELECTRICAL PRINT
Application Name Telephone
Business Name Telephone
Service Requested Amps Configuration: Volts
DU has adopted the National Electrical Code (NEC) as the minimum standard acceptable for electrical installations it serves. The Contractor should be aware that in addition to NEC requirements there may be more stringent requirements imposed by the Utility.
DU requires a detailed electrical print and detailed listing of the electrical load by a registered electrical engineer or licensed electrical contractor on all multi-residential, commercial and industrial services. Please ensure all applicable information required on the list below is attached to this cover sheet.
Checklist of Required Information
Site Plan Connected Load
Typical Electrical Service Checklist Conductors and Conduits Over-current Device(s) Meter(s) Equipment Bonding and Grounding Sealing Provisions Reduced Neutral Calculations
When you have submitted the required information, DU will prepare a “ Service Entrance Equipment Requirement” sheet. A copy of this sheet will be sent to the applicant. DO NOT ORDER equipment prior to receiving this “Service Entrance Equipment Requirement” sheet.
Load and Print Data Submitted by Date
Load and Print Data Received by Date
Phase
52

3.1 LOAD AND PRINT INFORMATION REQUIRED BY DU Site Plan Site plan shall include property lines or adjacent roadways; location of structure to be served by utility with respect to the property lines or roadways; location of service entrance equipment; location of DU transformer pole that is to serve your structure; distance between DU transformer pole and your service entrance equipment. Site plan shall be provided in AutoCAD format. Connected Load and NEC Load Calculation Provide the total connected load in kilovoltamps (kVA) as well as the NEC service load in kVA, computed in accordance with the current edition of the National Electric Code. This calculation shall be performed by or under the supervision of a registered professional electrical engineer. Motors and Starters: DU conducts a motor starting study for motors 10 horsepower and larger. If the load contains motor(s) rated 10 horsepower or larger, then the following data is required for each motor:
o Rated horsepower
o Voltage
o Indicate motor starting method (full voltage, reduced voltage [auto
transformer], or drive)
o Indicate motor starting and running sequence for multiple motors
Diversified Demand: If the load is a dwelling type load, then the demand (in kilowatts) shall be the load computed per the current edition of the National Electric Code. It shall include a calculation for the individual dwelling units as well as the total load on the service equipment. Electrical Print Include a oneline diagram AND riser diagram of service equipment from service entrance conductors through the main disconnect and describing all physical details of installation. Although not required at initial application, these prints should be stamped by a professional electrical engineer registered in the State of Alaska, and Doyon Utilities may request a set of stamped drawings prior to service hookup. Refer to the typical electric service checklists on pages 55 and 56.
o Conductors and conduits type, insulation, size, and number
o Overcurrent Device(s) and Equipment AIC rating

o Meter(s) including numbering system
o Equipment Bonding and Grounding per NEC and DU Electrical Service Entrance
Requirements
o Sealing Provisions All access to unmetered conductors or bussing shall have
provisions for installing split/lock seals in accordance with DU Service Security
Equipment Sealing program. All meter retaining rings shall be the screw type.
More detailed information is available on request.

electrical service line standards - Doyon Utilities

Text of electrical service line standards - Doyon Utilities

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