Concentric Cables
Concentric Cables
2020 EDITION
SPECIFICATION FOR PVC INSULATED SINGLE PHASE CONCENTRIC
COPPER CABLES (LOW VOLTAGE)
1. SCOPE
1.1 This specification is for PVC insulated single phase concentric cables with circular
stranded copper conductors for operation up to and including 1000 Volts between phases
and 600 Volts to earth. The cable shall have a central phase conductor insulated with red
PVC and concentric layer comprising bare wires (combined neutral-earth conductor),
both copper.
1.2 This specification covers the following sizes:-
10 sq. mm PVC insulated single phase concentric Copper cable
16 sq. mm PVC insulated single phase concentric Copper cable
25 sq. mm PVC insulated single phase concentric Copper cable
2. REFERENCES
The following documents were referred to during the preparation of this specification. In
cases of conflict, the provisions of this specification shall take precedence.
Unless otherwise specified, the latest revision, edition and amendments shall apply.
IEC 60502-1:- Power Cables with extruded insulation and their accessories for rated
voltages from 1kV (Um = 1.2kV) up to 30kV (Um = 36kV) – Part 1: Cables for rated
voltages of 1kV (Um = 1.2kV0 and 3kV (Um = 3.6kV).
KS 04-1022:- Kenya Standard Specification for 600/1000V PVC-insulated single-phase
concentric cables with copper or aluminum conductors for electricity supply.
3. MATERIAL AND CONSTRUCTION
3.1. The cable shall be designed and manufactured in accordance with IEC 60502-1 and
Kenya Standard KS 04-1022.
3.2.1 The phase conductor shall be circular stranded annealed copper conductors (class 2)
as specified in KS 04-1022. The phase conductor shall have a left-hand direction of lay.
3.2.2 The insulation of the phase conductor shall be red PVC compound specified in KS
04-1022. It shall be applied by an extrusion process and shall be spark tested in
accordance with KS 04-1022.
3.2.3 The thickness of insulation, determined in accordance with KS 04-1022, shall be not
less than the value given in Table 1 of this specification and the smallest of the measured
values shall not fall below the value given in the said table by more than (10% + 0.1mm).
3.3.1 The neutral conductor shall be concentric and shall be manufactured from plain
3.3.2 The concentric layer shall be applied with a right hand direction of lay.
3.4. Oversheath
3.4.1 The oversheath shall be an extruded layer of black PVC compound as specified in
KS 04-1022. The oversheath shall be spark tested in accordance with KS 04-1022.
3.4.2 The minimum thickness of the oversheath shall not fall below the value given in
Table 1 of this specification by an amount more than (15% + 0.1mm).
4. STANDARD SIZES AND CHARACTERISTICS
The characteristics of the cables shall comply with the following table.
Table 1: Characteristics (as per KS 04-1022)
Maximum
Concentric conductor dc
Phase Conductor
neutral resistance per
conductor Oversheath Approx. 1000m of cable
Minimum
Thickness overall at 20°C
lay length
mm diameter
mm
Insulation
mm
Nominal No. /Dia. No. /Dia. Phase Neutral
Thickness
area mm² mm mm ohms ohms
mm
1. SCOPE
This specification is for PVC insulated single phase concentric cables with circular
stranded Aluminum conductors for operation up to and including 1000 Volts between
phases and 600 Volts to earth. The cable shall have a central phase conductor insulated
with red PVC and concentric layer comprising bare aluminum wires (combined
neutral-earth conductor) and out sheath in black PVC.
2. REFERENCES
The following standard contains provisions which, through reference in this text
constitute provisions of this specification. Unless otherwise stated, the latest editions
(including amendments) apply.
ISO 9001: Quality Management System-Requirements
ISO/IEC 17025: General requirements for the competence of testing and calibration
laboratories.
KS 04-1022:- Kenya Standard Specification for 600/1000V PVC-insulated single-phase
concentric cables with copper or aluminum conductors for electricity
supply.
3.2.1 The phase conductor shall be circular stranded annealed Aluminum conductors
(class 2) as specified in KS 04-1022. The phase conductor shall have a left-hand direction
of lay.
3.2.2 The insulation of the phase conductor shall be red PVC compound specified in KS
04-1022. It shall be applied by an extrusion process and shall be spark tested in
accordance with KS 04-1022.
3.2.3 The thickness of insulation, determined in accordance with KS 04-1022, shall be not
less than the value given in Table 2 of this specification and the smallest of the measured
values shall not fall below the value given in the said table by more than (10% + 0.1mm).
3.3.1 The neutral conductor shall be concentric and shall be manufactured from plain
annealed aluminum wires in accordance with KS 04-1022. The number of wires and the
3.3.2 The concentric layer shall be applied with a right hand direction of lay.
3.4. Oversheath
3.4.1 The oversheath shall be an extruded layer of black PVC compound as specified in
KS 04-1022. The oversheath shall be spark tested in accordance with KS 04-1022.
3.4.2 The minimum thickness of the oversheath shall not fall below the value given in
Table 2 of this specification by an amount more than (15% + 0.1mm).
4 .STANDARD SIZES AND CHARACTERISTICS
The characteristics of the cables shall comply with table 2.
Table 2: Characteristics (as per KS 04-1022)
Maximum
Concentric conductor dc
Phase Conductor
neutral resistance per
conductor Approx. 1000m of cable
Minimum Oversheath
overall at 20°C
lay length Thickness
diameter
mm mm
Insulation
mm
Nominal No. / dia. No. / dia. Phase Neutral
Thickness
area mm² mm mm ohms ohms
mm
1. SCOPE
1.1 This specification is for LV PVC insulated single phase concentric cables with
embedded communication cables to be used by KPLC for split prepayment metering. The
cable shall carry both power and data in a single cable and shall have circular stranded
aluminum conductors insulated for operation up to and including 1000 Volts between
phases and 600 Volts to earth, concentric layers comprising of a blue PVC covered
aluminum wires (combined neutral-earth conductor) and PVC insulated Two (2)-cores
copper cables for data communication complete with a black PVC outer sheath.
1.2 The specification also covers inspection and test of the cables as well as schedule of
guaranteed technical particulars to be filled, signed by the manufacturer and submitted for
tender evaluation.
2. REFERENCES
The following standard contains provisions which, through reference in this text
constitute provisions of this specification. Unless otherwise stated, the latest editions
(including amendments) apply.
IEC60811-1-1: Common test methods for insulating and sheathing materials of electric
cables and optical cables – Part 1-1: Methods for general application –
Measurement of thickness and overall dimensions – Tests for determining
the mechanical properties
IEC 60304: Standard colours for insulation for low-frequency for cables wires
BS 7870-3.20: LV and MV polymeric insulated cables for use by distribution and
generation utilities –Part 3: Specification for distribution cables rated
voltage 0.6/1kV, -Section 3.20: PVC insulated split concentric cables with
copper or aluminum conductors.
BS 4808-1: Specification for L.F. cables and wires with PVC insulation and PVC
sheath for telecommunication – Part 1: General requirements and tests.
BS 6360: Specification of conductors in insulated cables and cords
BS 6746: Specification for PVC insulation and sheath of electric cables
KS 04-1022:- Kenya Standard Specification for 600/1000V PVC-insulated single-phase
concentric cables with copper or aluminum conductors for electricity
supply.
3.2.1 The phase conductor shall be circular stranded annealed Aluminum conductors
3.2.2 The insulation of the phase conductor shall be red PVC compound – type TI 1 as
specified in KS 04-1022, KS04-188 and BS 6746 and table 3 of this specification.
It shall be applied by an extrusion process and shall be spark tested in accordance with
KS 04-1022.
3.2.3 The thickness of insulation, determined in accordance with KS 04-1022, shall be not
less than the value given in Table 4 of this specification and the smallest of the measured
values shall not fall below the value given in the said table by more than (10% + 0.1mm).
3.3.1 The earth-neutral conductor shall be manufactured from plain annealed aluminum
wires in accordance with KS 04-1022 and as required by clause 6.1 of BS 7870-3.20:2001.
Conformity shall be checked by visual inspection. The D.C. resistance shall conform to
the values given in Table 4.
3.3.4.1 The concentric layer shall be applied with a right hand direction of lay. The wires
forming the neutral-earth continuity conductor and the communication cable shall be
applied helically in individual group over the insulation with a non-hygroscopic string
separation.
3.3.4.2 Either one two string hygroscopic string separation shall be located on either side
of the group of neutral-earth continuity conductor to separated them from the group of
insulated communication cables.
3.3.4.3 The length of the lay and the number of strings shall be such that the coverage of
approximately 90% is achieved. Conformity shall be checked through visual examination
as per BS 7870-3.20:2001 clause 14.3.
3.3.4.5 Binders
One or more overlapped synthetic binder tape(s) shall be applied immediately over the
concentric layer as per BS 7870-3.20:2001 clause 7.
3.4 Over-sheath or Outer Jacket
3.4.1 The oversheath shall be an extruded layer of black PVC compound –type TM 1 as
specified in KS 04-1022 and BS 6746. The oversheath shall be spark tested in accordance
with KS 04-1022.
3.4.2 The minimum thickness of the oversheath shall not shall below the values on Table
4 of this specification by an amount more than (15%+0.1mm).
3.4.3 The outer sheath insulation PVC compound shall be treated with anti-UV chemicals
prior to shaping by injection molding to prevent UV attack by sunlight.
3.4.4 A non-metallic rip-cord shall be laid under the sheath. It shall provide an effective
means of slitting the sheath longitudinally to facilitate removal. The rip cord shall
incorporate the manufacturer’s identification colors.
Table 3: Test requirements for insulation and Over-sheath PVS compounds – BS 6746
The concentric cable is used as electric service entrance from the power distribution
network until the meter panel (especially where it is required to prevent "black" losses
or electric power robbery), and as feeder cable from the meters panel until the panel
or general distribution panel, just as it is specified in the National Electrical Code.
This type of conductor can be used in dry and wet places, directly buried or outdoors;
its maximum temperature of operation is 70°C(PVC or PE Insulation) or 90 ºC(XLPE
Insulation) and its voltage of service for all the applications is 600 V.
2. Specifications
3. REFERENCES
The following documents were referred to during the preparation of this specification. In
cases of conflict, the provisions of this specification shall take precedence.
Unless otherwise specified, the latest revision, edition and amendments shall apply.
IEC 60502-1: Power Cables with extruded insulation and their accessories for rated
voltages from 1kV (Um = 1.2kV) up to 30kV (Um = 36kV) – Part 1:
Cables for rated voltages of 1kV (Um = 1.2kV0 and 3kV (Um = 3.6kV).
UL 44: Thermoset-Insulated Wires and Cables
UL 854: Service-Entrance Cables
Aluminum
3.1 Material del conductor / Conductor Material Material
8000
XLPE negro /
4.1 Material de aislación / Insulation Material Material
black XLPE
Aluminum
5.1 Material del conductor / Conductor Material Material
8000
Manufacturer
2x6mm2 0.6 /
Rotulado / 1KV Conductor
8.1 Leyenda/ Legend
labeled material,
insulation and
jacket "Year"
10.4 Peso del carrete con cable / Cable reel weight Kg 300
3
3.6 Densidad / Density gr/cm 2.710
XLPE negro /
4.1 Material de aislación / Insulation Material Material
black XLPE
Cableado /
5.4 Tipo de construcción / Construction Type Tipo / Type
Cabling
Poliester /
6.1 Material de la cinta / Ribbon material Material
polyester
Manufacturer
2x10mm2 0.6 /
Rotulado / 1KV Conductor
8.1 Leyenda/ Legend
labeled material,
insulation and
jacket "Year"
10.4 Peso del carrete con cable / Cable reel weight Kg 300
*Allowable Ampacities:
Allowable ampacities shown are for general use as specified by the NEC, 2005 Edition, section 310.15.
60°C - When terminated to equipment for circuits rated 100 amperes or less or marked for 14 through 1 AWG conductors.
75°C - When terminated to equipment for circuits rated over 100 amperes or marked for conductors larger than 1 AWG.
Dwelling - For units, conductors shall be permitted at listed ampacities as 120/240-volt, 3-wire, single-phase services and feeders.
Email:jackchencable@163.com