MEDIUM VOLTAGE CABLE
PART 1- GENERAL
1.01 RELATED DOCUMENTS
A. Drawings.
B. Requirements of the following Division 16 Sections apply to this section:
1. Basic Electrical Materials and Methods".
1.02 SUMMARY
A. This section includes multiple conductor cables and splices, terminations,
and accessories for cables above 1000V rating.
B. Related Sections: the following Division 16 Sections contain requirements
that relate to this Section :
1. "Raceways" for conduits and ducts for cable.
2. "Cable Trays" for cable tray type installations.
3. "Supporting Devices" for cable and termination supports.
4. "Power Transformers" for cable termination provisions.
5. “Medium Voltage Switchgear" for cable termination provisions.
6- Connection to BMS system, including interface elements detailed in
BMS schedules and/or shown on the drawings.
1.03 SUBMITALS
A. General: submit the following:
1. Product Data: on cables and cable accessories including descriptions and
detailed specifications.
2. Shop drawings of splices and terminations.
3. Product certificate signed by manufacturer that its products comply with
the specified requirements.
4. Installer certificates signed by manufacturer of cable splicing and
terminating products that Installers comply with training requirements
specified under "Quality Assurance".
5. Installer certificates signed by Contractor that Installers of cable splices
and terminations meet the required experience qualifications.
6. Product Test Reports: certified reports of manufacturers factory
production and final tests indicating compliance of cable and accessories
with referenced standards.
7. Report of Field Tests: certified copies of field test records.
8. Samples: 300 mm long of each type of cable specified.
2
9. Maintenance data for cables and accessories for inclusion in Operation
and Maintenance manual specified in Division 16, Section “Basic
Electrical Requirements". In addition to the requirements specified
there, include:
i. Manufacturer’s written instructions for periodic tests of cables in
service.
1.04 QUALITY ASSURANCE
A. Installer Qualifications: engage an experienced Installer of medium-voltage
electrical cable to perform the installation specified in this section. In
addition, for the specific work of cable splicing and terminating, engage
Installers who are experienced in cable splices for the specific types of cable
and cable accessories specified in this Section.
B. Field Testing Organization Qualifications: to qualify for acceptance, an
independent testing organization must demonstrate, based on evaluation of
organization-submitted criteria, that it has the experience and capability to
conduct satisfactorily the testing indicated in accordance with the Standards.
C. Standards Compliance: Cables and components shall be marked, listed and
labeled by Manufacturer in accordance with the approved standards of
manufacture (IEC , BS etc.).
D. IEC Compliance: components and installation shall comply with the
relevant IEC Standards and the local Authority specification having
jurisdiction.
1.05 DELIVERY, STORAGE AND HANDLING
A. Deliver medium-voltage cable on factory reels conforming to Standard
applicable or as otherwise specified.
B. Store cables on reels on elevated platforms in a clean, dry location.
1.06 WARRANTY
A. Special Project Warranty: submit a written warranty, mutually executed by
manufacturer and the principal Installer, agreeing to repair or replace
medium- voltage cables, splices, and terminations that fail in materials or
workmanship within the special project warranty period specified below.
This warranty shall be in addition to, and not a limitation of, other rights and
remedies the Employer may have against the Contractor under the Contract
Documents.
B. Special Project Warranty Period: 2 years beginning on the date of Substantial
Completion.
PART 2 –PRODUCTS
2.01 MANUFACTURERS
A. Avai1able Manufacturers: subject to compliance with requirements,
specifications, drawings & regulations.
3
B. Manufcturer to be selected from the list of recommended manufacturers.
2.02 MEDIUM VOLTAGE CABLE (GENERAL)
A. General: Cable shall be single or multi core conductor types , with types and
sizes as indicated and conforming to IEC Standard 502 “Extruded Solid
Dielectric Insulated Power Cables for rated voltages from 1 kV to 30 kV" or
other specification of equal or higher standards and as specified in
particulars below.
2.03 MV CABLE
A. One Core MV Cable 20 kV, XLPE insulated, for use on systems with
voltage 12 kV is to comply with IEC 502, and have the following
characteristics:
Conductor : Copper, circular, stranded and compacted.
Conductor screen : Extruded semi-conducting layer.
Insulation : Extruded cross-linked polyethylene (XLPE),
minimum 4.5 mm thick
Insulation screen : Non-metallic directly applied extruded semi-
Part conducting material, readily strippable.
Metallic part : Layer of copper tape applied with 15% overlap
(For multi core cables)
Filling and bedding : Polypropelene extruded over laid up , cores to
form compact circular bedding.
Armour : Double layer of galvanized steel tape (For multi
core cables).
Outer sheath : Extruded PVC type ST2 to IEC 502
Short-circuit : 28 kA (minimum) for one second rating
for 185mm2 cables.
B. Armoured cable: where required or shown on the drawings, is to have
single layer of aluminum wire or two layers of aluminum tape between
bedding and over sheath.
C. Cable Joints: to be as recommended by manufacturer, to render joints equal
to able in characteristics in terms of insulation, stress distribution and watertightness
Materials and methods of Jointing are to be approved before
confirmation of order.
2.04 SPLICING AND TERMINATING PRODUCTS
A. Types: compatible with the cable materials and equipment terminations
under respective equipment sections of this specification. Approval by the
Engineer for each particular type is required before ordering materials.
B. Connectors: compression type as recommended by cable or splicing kit
manufacturer for the application.
4
C. Splicing and Terminating Kits: as recommended by the manufacturer in
writing for the specific size, ratings, and configurations of cable conductor,
splices, and terminations specified. Kits shall contain all components
required for a complete splice or termination including detailed instructions
and shall be the product of a single manufacturer. Completed splices and
terminations shall provide insulation equivalent to the insulation class of the
cable it connects, as well as protection.
D. Multiconductor Cable Sheath Seals: designed to seal the end of
multiconductor cable against moisture where the sheath ends at a cable
terminations. Seal shall be of the type recommended by the seal
manufacturer for the specific type of cable and installation and conditions of
use, including orientation of the device (upright, horizontal or inverted)
where this affects selection. Seal fittings for armoured cable shall include
provision for earthing the metal cable armor.
PART –3 EXECUTION
3.01 EXAMINATION
A. Examine raceways, cable trays, pull boxes, manholes, junction boxes, and
other cable installation locations for cleanliness of raceways, minimum
bending radii of cables, and conditions affecting performance of cable. Pull
a mandrel through raceways to check for suitable conditions. Do not
proceed with cable installation until unsatisfactory' conditions have been
corrected.
3.02 INSTALLATION (GENERAL)
A. General: install cable accessory items in accordance with manufacturer's
written instructions and as indicated.
3.03 INSTALLATION OF CABLES
A. Refer to Section "L V wires and Cables" for feeder and subfeeder cable
installation requirements applicable to this Section.
B. Pull conductors simultaneously where more than one cable is indicated in
same raceway. Use manufacturer-approved pulling compound or lubricant
where necessary. Do not exceed manufacturer's recommended maximum
pulling tensions and sidewall pressure values.
C. Use pulling means including, fish tape, cable, rope, and basket weave
wire/cable grips that will not damage cables or raceways. Do not use rope
hitches for pulling attachment to cable.
D. Install exposed cable parallel and perpendicular to surfaces of exposed
structural members and follow surface contours where possible.
E. In trenches, pull boxes and cable vaults, train cables around walls by the
longest route from entry to exit and support cables at intervals adequate to
prevent sag.
5
3.04 INSTALLATION OF SPLICES
A. Install splices at pull points and elsewhere as indicated using standard kit.
Conform to kit manufacturer's written instructions.
3.05 JOINTING AND TERMINATIONS
A. Install though joints and terminations at ends of conductors and seal multi
conductor cable ends with standard kits. Conform to manufacturer's written
instructions. Comply with classes of terminations indicated.
B. Through joints will not be allowed in feeder cables where adequate
manufacturer's lengths are available. Where a joint is necessary, it has to be
made inside boxes, handholes or manholes.
C. Recommendations: through joints and terminations are to be carried out
strictly in accordance with cable manufacturer's recommendations, and
made with correct specified materials, boxes, tapes, compounds or mixtures,
stress cones, glands and bonds as applicable.
D. Samples: samples of joints and terminations are to be constructed and are to
be available for testing and inspection in accordance with manufacturer’s
recommendations in the presence of the Engineer.
E. Cutting tools for jointing and terminating cables are to be purpose made, to
prevent damage to insulation in general, and to shielding of cables.
F. Cleaning of lacquer on conductors is to be by use of 'Scotch Brite' sponge
and white spirit or equal approved.
G. Tighten electrical connectors and terminals in accordance with
manufacturer's published torque tightening values. Where manufacturer's
torquing requirements are not indicated, tighten connectors and terminals to
comply with tightening torques specified in applicable standards of
manufacture.
3.06 EARTHING
A. Earth shields of shielded cable at terminations, splices, and separable
insulated connectors. Earth metal bodies of terminators, splices, cable and
separable insulated connector fittings and hardware in accordance with
manufacturer's written instructions.
.
3.07 IDENTIFICATION
A. Identify cable in accordance with Division 16 Section "Electrical
identification".
3.08 FIELD QUALITY CONTROL
A. General: Comply with applicable standards of reputable international
electrical testing organization.
B. Preparation: perform the following preparations in advance of independent
test:
6
1. Test cables insulation resistance.
2. Test circuits continuity.
3. Furnish a set of Contract Documents and manufacturer's
recommendations to test organization.
4. Make power available at test locations.
C. Schedule tests and notify Engineer at least one week in advance of schedule
for test commencement.
D. Test procedure shall conform to the following:
1. Independent Testing Organization: arrange and pay for the services of an
independent electrical testing organization.
2. Test Objectives: to assure cable installation is operational within
industry and manufacturer’s tolerances, is installed in accordance with
contract documents and is suitable for energizing.
3. Procedures: comply with the testing organization standards and upon
satisfactory completion of tests, attach a label to tested components.
E. Tests shall include high-potential test of cable and accessories and tests and
examinations required to achieve specified objectives. Where new cables are
spliced to existing cables, the high-potential test shall be performed on the
new cable prior to splicing. After test results for new cables are approved
and splice is made, an insulation resistance test and continuity test are to be
done on the length of cable including the splice and existing cables being
tested to the nearest disconnect point.
F. MV Cable Testing : provide cable test-set with d.c. output voltage and
ampere range sufficient to test MV cables. Cables are to be laid in position
(trench or duct bank), jointed where applicable, but left uncovered, with
ends free of equipment and clear of ground .
1. D.C. test voltage is to be applied between core under test and the screen
in steps, pausing one minute or more each step (first step being the a.c.
rms rated voltage of the cable, followed by two equal steps) up to
maximum test voltage. At each step, and for the last 5 -15 minutes
duration at maximum test voltage, the ammeter (normally a microammeter)
is to be closely watched and recorded. If except as voltage is
increased, the current starts to increase, test is to be stopped and the
installation inspected and tested for the fault.
2. Each cable/core is to be tested independently. Maximum d.c. test voltage
for grounded neutral system is to be 3 times rated a.c. rms voltage of
cable.
G. MV Cable Testing: alternative test is to apply a.c. rms voltage up to 15
times a.c rms rating of cable (15 kV cable), applied for 15 minutes, by an
approved a.c test set. Readings are to be within same range and in
accordance with IEC 502.
H. Reports : the testing organization n shall maintain a written record of
observations and tests, report defective materials and workmanship, and
7
retest corrected defective items. Testing organization shall submit written
reports to the Engineer and Contractor.
END OF SECTION 16124
PART 1- GENERAL
1.01 RELATED DOCUMENTS
A. Drawings.
B. Requirements of the following Division 16 Sections apply to this section:
1. Basic Electrical Materials and Methods".
1.02 SUMMARY
A. This section includes multiple conductor cables and splices, terminations,
and accessories for cables above 1000V rating.
B. Related Sections: the following Division 16 Sections contain requirements
that relate to this Section :
1. "Raceways" for conduits and ducts for cable.
2. "Cable Trays" for cable tray type installations.
3. "Supporting Devices" for cable and termination supports.
4. "Power Transformers" for cable termination provisions.
5. “Medium Voltage Switchgear" for cable termination provisions.
6- Connection to BMS system, including interface elements detailed in
BMS schedules and/or shown on the drawings.
1.03 SUBMITALS
A. General: submit the following:
1. Product Data: on cables and cable accessories including descriptions and
detailed specifications.
2. Shop drawings of splices and terminations.
3. Product certificate signed by manufacturer that its products comply with
the specified requirements.
4. Installer certificates signed by manufacturer of cable splicing and
terminating products that Installers comply with training requirements
specified under "Quality Assurance".
5. Installer certificates signed by Contractor that Installers of cable splices
and terminations meet the required experience qualifications.
6. Product Test Reports: certified reports of manufacturers factory
production and final tests indicating compliance of cable and accessories
with referenced standards.
7. Report of Field Tests: certified copies of field test records.
8. Samples: 300 mm long of each type of cable specified.
2
9. Maintenance data for cables and accessories for inclusion in Operation
and Maintenance manual specified in Division 16, Section “Basic
Electrical Requirements". In addition to the requirements specified
there, include:
i. Manufacturer’s written instructions for periodic tests of cables in
service.
1.04 QUALITY ASSURANCE
A. Installer Qualifications: engage an experienced Installer of medium-voltage
electrical cable to perform the installation specified in this section. In
addition, for the specific work of cable splicing and terminating, engage
Installers who are experienced in cable splices for the specific types of cable
and cable accessories specified in this Section.
B. Field Testing Organization Qualifications: to qualify for acceptance, an
independent testing organization must demonstrate, based on evaluation of
organization-submitted criteria, that it has the experience and capability to
conduct satisfactorily the testing indicated in accordance with the Standards.
C. Standards Compliance: Cables and components shall be marked, listed and
labeled by Manufacturer in accordance with the approved standards of
manufacture (IEC , BS etc.).
D. IEC Compliance: components and installation shall comply with the
relevant IEC Standards and the local Authority specification having
jurisdiction.
1.05 DELIVERY, STORAGE AND HANDLING
A. Deliver medium-voltage cable on factory reels conforming to Standard
applicable or as otherwise specified.
B. Store cables on reels on elevated platforms in a clean, dry location.
1.06 WARRANTY
A. Special Project Warranty: submit a written warranty, mutually executed by
manufacturer and the principal Installer, agreeing to repair or replace
medium- voltage cables, splices, and terminations that fail in materials or
workmanship within the special project warranty period specified below.
This warranty shall be in addition to, and not a limitation of, other rights and
remedies the Employer may have against the Contractor under the Contract
Documents.
B. Special Project Warranty Period: 2 years beginning on the date of Substantial
Completion.
PART 2 –PRODUCTS
2.01 MANUFACTURERS
A. Avai1able Manufacturers: subject to compliance with requirements,
specifications, drawings & regulations.
3
B. Manufcturer to be selected from the list of recommended manufacturers.
2.02 MEDIUM VOLTAGE CABLE (GENERAL)
A. General: Cable shall be single or multi core conductor types , with types and
sizes as indicated and conforming to IEC Standard 502 “Extruded Solid
Dielectric Insulated Power Cables for rated voltages from 1 kV to 30 kV" or
other specification of equal or higher standards and as specified in
particulars below.
2.03 MV CABLE
A. One Core MV Cable 20 kV, XLPE insulated, for use on systems with
voltage 12 kV is to comply with IEC 502, and have the following
characteristics:
Conductor : Copper, circular, stranded and compacted.
Conductor screen : Extruded semi-conducting layer.
Insulation : Extruded cross-linked polyethylene (XLPE),
minimum 4.5 mm thick
Insulation screen : Non-metallic directly applied extruded semi-
Part conducting material, readily strippable.
Metallic part : Layer of copper tape applied with 15% overlap
(For multi core cables)
Filling and bedding : Polypropelene extruded over laid up , cores to
form compact circular bedding.
Armour : Double layer of galvanized steel tape (For multi
core cables).
Outer sheath : Extruded PVC type ST2 to IEC 502
Short-circuit : 28 kA (minimum) for one second rating
for 185mm2 cables.
B. Armoured cable: where required or shown on the drawings, is to have
single layer of aluminum wire or two layers of aluminum tape between
bedding and over sheath.
C. Cable Joints: to be as recommended by manufacturer, to render joints equal
to able in characteristics in terms of insulation, stress distribution and watertightness
Materials and methods of Jointing are to be approved before
confirmation of order.
2.04 SPLICING AND TERMINATING PRODUCTS
A. Types: compatible with the cable materials and equipment terminations
under respective equipment sections of this specification. Approval by the
Engineer for each particular type is required before ordering materials.
B. Connectors: compression type as recommended by cable or splicing kit
manufacturer for the application.
4
C. Splicing and Terminating Kits: as recommended by the manufacturer in
writing for the specific size, ratings, and configurations of cable conductor,
splices, and terminations specified. Kits shall contain all components
required for a complete splice or termination including detailed instructions
and shall be the product of a single manufacturer. Completed splices and
terminations shall provide insulation equivalent to the insulation class of the
cable it connects, as well as protection.
D. Multiconductor Cable Sheath Seals: designed to seal the end of
multiconductor cable against moisture where the sheath ends at a cable
terminations. Seal shall be of the type recommended by the seal
manufacturer for the specific type of cable and installation and conditions of
use, including orientation of the device (upright, horizontal or inverted)
where this affects selection. Seal fittings for armoured cable shall include
provision for earthing the metal cable armor.
PART –3 EXECUTION
3.01 EXAMINATION
A. Examine raceways, cable trays, pull boxes, manholes, junction boxes, and
other cable installation locations for cleanliness of raceways, minimum
bending radii of cables, and conditions affecting performance of cable. Pull
a mandrel through raceways to check for suitable conditions. Do not
proceed with cable installation until unsatisfactory' conditions have been
corrected.
3.02 INSTALLATION (GENERAL)
A. General: install cable accessory items in accordance with manufacturer's
written instructions and as indicated.
3.03 INSTALLATION OF CABLES
A. Refer to Section "L V wires and Cables" for feeder and subfeeder cable
installation requirements applicable to this Section.
B. Pull conductors simultaneously where more than one cable is indicated in
same raceway. Use manufacturer-approved pulling compound or lubricant
where necessary. Do not exceed manufacturer's recommended maximum
pulling tensions and sidewall pressure values.
C. Use pulling means including, fish tape, cable, rope, and basket weave
wire/cable grips that will not damage cables or raceways. Do not use rope
hitches for pulling attachment to cable.
D. Install exposed cable parallel and perpendicular to surfaces of exposed
structural members and follow surface contours where possible.
E. In trenches, pull boxes and cable vaults, train cables around walls by the
longest route from entry to exit and support cables at intervals adequate to
prevent sag.
5
3.04 INSTALLATION OF SPLICES
A. Install splices at pull points and elsewhere as indicated using standard kit.
Conform to kit manufacturer's written instructions.
3.05 JOINTING AND TERMINATIONS
A. Install though joints and terminations at ends of conductors and seal multi
conductor cable ends with standard kits. Conform to manufacturer's written
instructions. Comply with classes of terminations indicated.
B. Through joints will not be allowed in feeder cables where adequate
manufacturer's lengths are available. Where a joint is necessary, it has to be
made inside boxes, handholes or manholes.
C. Recommendations: through joints and terminations are to be carried out
strictly in accordance with cable manufacturer's recommendations, and
made with correct specified materials, boxes, tapes, compounds or mixtures,
stress cones, glands and bonds as applicable.
D. Samples: samples of joints and terminations are to be constructed and are to
be available for testing and inspection in accordance with manufacturer’s
recommendations in the presence of the Engineer.
E. Cutting tools for jointing and terminating cables are to be purpose made, to
prevent damage to insulation in general, and to shielding of cables.
F. Cleaning of lacquer on conductors is to be by use of 'Scotch Brite' sponge
and white spirit or equal approved.
G. Tighten electrical connectors and terminals in accordance with
manufacturer's published torque tightening values. Where manufacturer's
torquing requirements are not indicated, tighten connectors and terminals to
comply with tightening torques specified in applicable standards of
manufacture.
3.06 EARTHING
A. Earth shields of shielded cable at terminations, splices, and separable
insulated connectors. Earth metal bodies of terminators, splices, cable and
separable insulated connector fittings and hardware in accordance with
manufacturer's written instructions.
.
3.07 IDENTIFICATION
A. Identify cable in accordance with Division 16 Section "Electrical
identification".
3.08 FIELD QUALITY CONTROL
A. General: Comply with applicable standards of reputable international
electrical testing organization.
B. Preparation: perform the following preparations in advance of independent
test:
6
1. Test cables insulation resistance.
2. Test circuits continuity.
3. Furnish a set of Contract Documents and manufacturer's
recommendations to test organization.
4. Make power available at test locations.
C. Schedule tests and notify Engineer at least one week in advance of schedule
for test commencement.
D. Test procedure shall conform to the following:
1. Independent Testing Organization: arrange and pay for the services of an
independent electrical testing organization.
2. Test Objectives: to assure cable installation is operational within
industry and manufacturer’s tolerances, is installed in accordance with
contract documents and is suitable for energizing.
3. Procedures: comply with the testing organization standards and upon
satisfactory completion of tests, attach a label to tested components.
E. Tests shall include high-potential test of cable and accessories and tests and
examinations required to achieve specified objectives. Where new cables are
spliced to existing cables, the high-potential test shall be performed on the
new cable prior to splicing. After test results for new cables are approved
and splice is made, an insulation resistance test and continuity test are to be
done on the length of cable including the splice and existing cables being
tested to the nearest disconnect point.
F. MV Cable Testing : provide cable test-set with d.c. output voltage and
ampere range sufficient to test MV cables. Cables are to be laid in position
(trench or duct bank), jointed where applicable, but left uncovered, with
ends free of equipment and clear of ground .
1. D.C. test voltage is to be applied between core under test and the screen
in steps, pausing one minute or more each step (first step being the a.c.
rms rated voltage of the cable, followed by two equal steps) up to
maximum test voltage. At each step, and for the last 5 -15 minutes
duration at maximum test voltage, the ammeter (normally a microammeter)
is to be closely watched and recorded. If except as voltage is
increased, the current starts to increase, test is to be stopped and the
installation inspected and tested for the fault.
2. Each cable/core is to be tested independently. Maximum d.c. test voltage
for grounded neutral system is to be 3 times rated a.c. rms voltage of
cable.
G. MV Cable Testing: alternative test is to apply a.c. rms voltage up to 15
times a.c rms rating of cable (15 kV cable), applied for 15 minutes, by an
approved a.c test set. Readings are to be within same range and in
accordance with IEC 502.
H. Reports : the testing organization n shall maintain a written record of
observations and tests, report defective materials and workmanship, and
7
retest corrected defective items. Testing organization shall submit written
reports to the Engineer and Contractor.
END OF SECTION 16124
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