This British Standard specifies requirements and test methods for the construction, dimensions and mechanical and electrical properties of armoured cables with thermosetting insulation for rated voltages from 3.8\/6.6 (7.2) kV up to 19\/33 (36) kV inclusive which, when assessed by the specified tests, produce lower levels of smoke and corrosive gases on exposure to fire compared to the cables specified in BS 6622. It covers cables designed for a maximum continuous conductor operating temperature of 90 \u00b0C and for a maximum short circuit conductor temperature of 250 \u00b0C, for use in fixed installations such as networks or industrial installations.<\/p>\n
This British Standard specifies single-core and three-core cables for voltages in the range 3.8\/6.6 (7.2) kV up to 19\/33 (36) kV, with:<\/p>\n
\nNOTE Guidance on the selection of cables is given in Annex A. Information to be supplied by the purchaser, and items to be agreed between the purchaser and the manufacturer, at the time of enquiry and\/or order, are given in Annex B. Recommendations for the installation of cables are given in Annex C. Guidance on the use of cables is given in Annex D.<\/i><\/p>\n<\/blockquote>\n
PDF Catalog<\/h4>\n
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\n PDF Pages<\/th>\n PDF Title<\/th>\n<\/tr>\n \n 3<\/td>\n Contents
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 Voltage designation 4
5 Non-metallic materials 4
6 Conductors 4
7 Conductor screen 4
8 Insulation 4
9 Insulation screen 5
10 Assembly of three-core cables, including inner coverings and fillers 5
11 Metallic layer 7
12 Metallic armour 8
13 Oversheath 9
14 Marking 10
15 End sealing 11
16 Schedule of tests 12
17 Test conditions 14
18 Routine tests 14
19 Sample tests 16
20 Type tests – Materials 21
21 Type tests – Electrical 25
Annexes
Annex A (informative) Recommendations for the selection of cables 29
Annex B (normative) Information to be supplied and items to be agreed 32
Annex C (informative) Recommendations for the installation of cables 33
Annex D (informative) Guide to use of cables 36
Annex E (normative) Fictitious calculation method for determination of dimensions of protective coverings 38
Annex F (normative) Rounding of numbers 43
Annex G (informative) Guidance on the scope of type tests 44
Annex H (normative) Thickness measurements 47
Annex I (normative) Test method for cold strippability of the extruded semi-conducting layer of an insulation screen 47
Annex J (normative) Method for measurement of resistivity of extruded semi-conducting conductor screen and insulation screen 48
Annex K (normative) Method for measurement of resistivity of lapped inner covering 51
Annex L (normative) Wet compatibility test for galvanized steel wires and semi-conducting tape layers 52
Annex M (normative) Abrasion test 53
Annex N (normative) Test for shrinkage of oversheath on cable 54
Annex O (normative) Insulation resistance constant test on oversheath 55
Bibliography 56 <\/td>\n<\/tr>\n\n 4<\/td>\n List of figures
Figure J.1 – Test piece and arrangement of electrodes for measurement of resistivity of the conductor screen 50
Figure J.2 – Test piece and arrangement of electrodes for measurement of resistivity of the insulation screen 51
Figure L.1 – Test cell for wet compatibility test of galvanized steel wires and semi-conducting tape layers 52
Figure M.1 – Abrasion test 54
List of tables
Table 1 – Nominal thickness of insulation 5
Table 2 – Thickness of extruded inner covering 6
Table 3 – Nominal diameter of round armour wires 8
Table 4 – Schedule of tests 12
Table 5 – Tolerances on temperature values 14
Table 6 – DC resistance of copper wire screen 15
Table 7 – Voltage for partial discharge test 15
Table 8 – Voltage test on complete cable 16
Table 9 – Number of samples for the four-hour voltage test, the hot set test on the insulation and the smoke emission test 17
Table 10 – Minimum transmittance levels 20
Table 11 – Voltages for four-hour voltage test 21
Table 12 – Mass of zinc coating 22
Table 13 – Compatibility requirements 24
Table 14 – Tan d in relation to voltage 26
Table 15 – Tan d in relation to temperature 26
Table 16 – Voltage for impulse voltage test 27
Table A.1 – Selection of cables for three-phase a.c. systems 30
Table C.1 – Bending radius during installation 33
Table C.2 – Bending radius during installation for cables adjacent to joints or terminations 33
Table E.1 – Fictitious diameter of conductor 40
Table E.2 – Increase of diameter for concentric conductors and metallic screens 41
Table M.1 – Vertical force on cable during abrasion test 53 <\/td>\n<\/tr>\n\n 5<\/td>\n Foreword <\/td>\n<\/tr>\n \n 7<\/td>\n 1 Scope
2 Normative references <\/td>\n<\/tr>\n\n 8<\/td>\n 3 Terms and definitions
3.1 rated voltage
3.2 rated voltage U0
3.3 rated voltage U <\/td>\n<\/tr>\n\n 9<\/td>\n 3.4 maximum voltage Um
3.5 cross-linked polyethylene (XLPE)
3.6 ethylene propylene rubber compound (EPR)
3.7 nominal value
3.8 approximate value
3.9 fictitious value
3.10 routine tests
3.11 sample tests
3.12 type tests <\/td>\n<\/tr>\n\n 10<\/td>\n 4 Voltage designation
5 Non-metallic materials
6 Conductors
7 Conductor screen
8 Insulation <\/td>\n<\/tr>\n\n 11<\/td>\n Table 1 Nominal thickness of insulation
9 Insulation screen
9.1 General
9.2 Extruded semi-conducting layer
10 Assembly of three-core cables, including inner coverings and fillers
10.1 General
10.2 Inner coverings and fillers <\/td>\n<\/tr>\n\n 12<\/td>\n Table 2 Thickness of extruded inner covering
10.3 Cables with a collective metallic layer
10.4 Cables with a metallic layer over each individual core <\/td>\n<\/tr>\n\n 13<\/td>\n 11 Metallic layer
11.1 General
11.2 Metallic screen on each core
11.3 Collective metallic screen <\/td>\n<\/tr>\n\n 14<\/td>\n 12 Metallic armour
12.1 Construction
12.1.1 General
Table 3 Nominal diameter of round armour wires
12.1.2 Material
12.1.3 Application of armour
12.1.3.1 Single-core cables
12.1.3.2 Three-core cables <\/td>\n<\/tr>\n\n 15<\/td>\n 12.2 Separation sheath
13 Oversheath
13.1 General
13.2 Thickness of oversheath <\/td>\n<\/tr>\n\n 16<\/td>\n 13.3 Semi-conducting layer
14 Marking
14.1 External marking <\/td>\n<\/tr>\n\n 17<\/td>\n 14.2 Identification of year of manufacture
14.3 The mark of an approval organization
14.4 Additional marking
15 End sealing <\/td>\n<\/tr>\n\n 18<\/td>\n 16 Schedule of tests
Table 4 Schedule of tests <\/td>\n<\/tr>\n\n 19<\/td>\n Table 4 Schedule of tests (continued) <\/td>\n<\/tr>\n \n 20<\/td>\n 17 Test conditions
17.1 Ambient temperature
17.2 Tolerances on temperature values
Table 5 Tolerances on temperature values
17.3 Frequency and waveform of power-frequency test voltages
18 Routine tests
18.1 General
18.2 Spark test on oversheath
18.3 Conductor resistance <\/td>\n<\/tr>\n\n 21<\/td>\n 18.4 Copper wire screen resistance
18.4.1 Method
18.4.2 Requirement
Table 6 DC resistance of copper wire screen
18.5 Partial discharge test
Table 7 Voltage for partial discharge test
18.6 Voltage test on complete cable <\/td>\n<\/tr>\n\n 22<\/td>\n Table 8 Voltage test on complete cable
18.7 Cable markings
18.8 D.C. voltage test on oversheath
18.8.1 General
18.8.2 Method
18.8.3 Requirement
19 Sample tests
19.1 General
19.2 Sampling frequency <\/td>\n<\/tr>\n\n 23<\/td>\n Table 9 Number of samples for the four-hour voltage test, the hot set test on the insulation and the smoke emission test
19.3 Repetition of sample tests
19.4 Conductor material and construction
19.5 Conductor screen
19.6 Hot set test on insulation <\/td>\n<\/tr>\n\n 24<\/td>\n 19.7 Dimensions
19.7.1 Thickness of insulation
19.7.2 Concentricity of insulation
19.8 Circularity of cores
19.8.1 Method
19.8.2 Requirement
19.9 Insulation screen
19.9.1 Application <\/td>\n<\/tr>\n\n 25<\/td>\n 19.9.2 Cold strippability
19.10 Metallic screen (wires only)
19.11 Assembly of three-core cables
19.12 Separation sheath
19.13 Semi-conducting lapped inner covering
19.14 Measurement of armour wires <\/td>\n<\/tr>\n\n 26<\/td>\n 19.15 Oversheath thickness
19.16 Flame propagation on single cable
19.17 Smoke emission test
Table 10 Minimum transmittance levels <\/td>\n<\/tr>\n\n 27<\/td>\n 19.18 Four-hour voltage test
19.18.1 Method
19.18.2 Requirement
Table 11 Voltages for four-hour voltage test
20 Type tests – Materials
20.1 General
20.2 Corrosive and acid gas
20.3 Conductor screen resistivity
20.4 Insulation material <\/td>\n<\/tr>\n\n 28<\/td>\n 20.5 Insulation screen resistivity
20.6 Insulation screen cold strippability
20.7 Semi-conducting lapped inner covering resistivity
20.8 Separation sheath material
20.9 Mass of zinc coating of galvanized steel wires
20.9.1 Method
20.9.2 Requirement
Table 12 Mass of zinc coating <\/td>\n<\/tr>\n\n 29<\/td>\n 20.10 Wrapping test for galvanized steel wires
20.10.1 Method
20.10.2 Requirement
20.11 Wet compatibility test for galvanized steel wires and semi-conducting tape layers
20.11.1 Method
20.11.2 Requirements
20.12 Tensile test for aluminium wires
20.12.1 Method
20.12.2 Requirement
20.13 Oversheath material <\/td>\n<\/tr>\n\n 30<\/td>\n 20.14 Compatibility test
Table 13 Compatibility requirements
20.15 Flame propagation on multiple cables
20.16 Smoke emission test
20.17 Abrasion test <\/td>\n<\/tr>\n\n 31<\/td>\n 20.18 Test for shrinkage of oversheath on cable
21 Type tests – Electrical
21.1 General
21.2 Partial discharge test
21.3 Bending test
21.3.1 Method
21.3.2 Requirements <\/td>\n<\/tr>\n\n 32<\/td>\n 21.4 Tan d in relation to voltage
Table 14 Tan d in relation to voltage
21.5 Tan d in relation to temperature
21.5.1 Method
21.5.2 Requirements
Table 15 Tan d in relation to temperature
21.6 Heating cycle test
21.6.1 Method <\/td>\n<\/tr>\n\n 33<\/td>\n 21.6.2 Requirement
21.7 Impulse voltage test
Table 16 Voltage for impulse voltage test
21.8 Four-hour voltage test
21.9 Adherence of screens at short circuit temperature
21.9.1 Method <\/td>\n<\/tr>\n\n 34<\/td>\n 21.9.2 Requirement
21.10 Insulation resistance constant of oversheath <\/td>\n<\/tr>\n\n 35<\/td>\n Annex A (informative) Recommendations for the selection of cables
A.1 General
A.2 Voltage ratings
a) Category A. This category comprises those systems in which any phase conductor that comes in contact with earth or an earth conductor is disconnected from the system within 1 min.
b) Category B. This category comprises those systems which, under fault conditions, are operated for a short time with one phase…
c) Category C. This category comprises all systems which do not fall into categories A or B. <\/td>\n<\/tr>\n\n 36<\/td>\n Table A.1 Selection of cables for three-phase a.c. systems
A.3 Metallic coverings
A.4 Selection of metallic coverings in relation to earth fault capacity <\/td>\n<\/tr>\n\n 37<\/td>\n A.5 Semi-conducting layer on the oversheath
a) when the oversheath is required to perform an insulating function during the operation of the cable. This applies when the me…
b) when damage to the oversheath is likely to lead to corrosion of an essential metallic layer which it protects, due to an environment aggressive to the particular metal.
A.6 Current carrying capacity <\/td>\n<\/tr>\n\n 38<\/td>\n Annex B (normative) Information to be supplied and items to be agreed
B.1 Information to be supplied by the purchaser at the time of enquiry and\/or order
a) length of cable required, and individual drum lengths, if particular drum lengths are required;
b) voltage designation (see Clause 4);
c) number of cores;
d) size of phase conductor;
e) conductor material (i.e. copper or aluminium) (see Clause 6);
f) type of conductor (i.e. stranded or solid) (see Clause 6);
g) type of insulation (i.e. XLPE or EPR) and limiting dimensions (if any) of the cores;
h) whether the insulation screen is required to be cold strippable (see 9.2);
i) type of metallic insulation screen (see Clause 11);
j) cross-sectional area of metallic insulation screen;
k) if an armour layer with a special construction is required which requires the armour to be made of magnetic material (see 12.1.2);
l) if a steel armour layer with a specific minimum conductance is required (see 12.1.2 Note).
m) nominal thickness of oversheath if a thickness other than that specified in 13.2 is required;
n) if a d.c. voltage test on the oversheath is required (see 13.3 and 18.8).
B.2 Items to be agreed between the purchaser and the manufacturer
a) colour of the oversheath if a colour other than black is required (see 13.1 Note);
b) sampling frequency for sample tests if different from that specified in 19.2. <\/td>\n<\/tr>\n\n 39<\/td>\n Annex C (informative) Recommendations for the installation of cables
C.1 Minimum temperature during installation
C.2 Minimum installation radius
Table C.1 Bending radius during installation
Table C.2 Bending radius during installation for cables adjacent to joints or terminations
C.3 Prevention of moisture ingress <\/td>\n<\/tr>\n\n 40<\/td>\n C.4 Joints and terminations
a) moulded components;
b) various tapes;
c) heat shrinkable tubes.
C.5 Compound filling <\/td>\n<\/tr>\n\n 41<\/td>\n C.6 Earthing of armour and screen(s)
C.7 Tests after installation
C.7.1 Tests on insulation
a) The cable should be tested for 5 min with the phase-to-phase voltage of the system applied between the conductor and the metallic screen or sheath.
b) The cable should be tested for 24 h with the normal operating voltage. <\/td>\n<\/tr>\n\n 42<\/td>\n C.7.2 D.C. voltage test on oversheath
Annex D (informative) Guide to use of cables
D.1 General
D.2 Cable selection in relation to installation design
a) In a solidly or directly earthed system, in general the earth fault current is at least equal to the three-phase or phase-to-phase fault current.
b) When an earth fault current is specified for a system, it is necessary to ensure that the phase conductor of the cable selected has a corresponding earth fault capacity.
c) Some work on spiking of cables has been undertaken by the British cable industry and it has shown that, in general, the spiking capability of the screen(s) is less than their through fault capacity. <\/td>\n<\/tr>\n\n 43<\/td>\n d) This standard specifies different forms of metallic screen having different earth fault capacities. In general, copper tape s…
e) It is essential that connections at joints between, and terminations onto, metallic elements carrying fault currents to earth have an earth fault capacity at least equal to that of the metallic elements.
D.3 Environmental factors
a) for use as self supporting aerial cables;
b) for use as submarine cable or for laying in water-logged conditions;
c) for use in situations where subsidence is likely, unless special precautions are taken to minimize damage if subsidence should occur;
d) for use in situations where they could be exposed to excessive heat.
D.4 Installation <\/td>\n<\/tr>\n\n 44<\/td>\n D.5 Storage and handling of drums
D.6 Incineration of scrap cable
Annex E (normative) Fictitious calculation method for determination of dimensions of protective coverings <\/td>\n<\/tr>\n\n 45<\/td>\n E.1 General <\/td>\n<\/tr>\n \n 46<\/td>\n E.2 Method
E.2.1 Conductors
Table E.1 – Fictitious diameter of conductor
E.2.2 Cores
E.2.3 Diameter over laid-up cores <\/td>\n<\/tr>\n\n 47<\/td>\n E.2.4 Inner coverings
a) three-core cables:
b) single-core cables:
E.2.5 Concentric conductors and metallic screens
Table E.2 – Increase of diameter for concentric conductors and metallic screens
a) tape screen <\/td>\n<\/tr>\n\n 48<\/td>\n b) wire screen (with a counter helix, if any)
E.2.6 Separation sheath
E.2.7 Armour <\/td>\n<\/tr>\n\n 49<\/td>\n Annex F (normative) Rounding of numbers
F.1 Rounding of numbers for the purpose of the fictitious calculation method
a) When the figure in the second decimal place, before rounding, is 0, 1, 2, 3 or 4, then the figure retained in the first decimal place shall remain unchanged (i.e. the value shall be rounded down).
b) When the figure in the second decimal place, before rounding, is 5, 6, 7, 8 or 9, then the figure in the first decimal place shall be increased by one (i.e. the value shall be rounded up).
F.2 Rounding of numbers for other purposes
a) If the last figure to be retained is followed, before rounding, by 0, 1, 2, 3 or 4, it shall remain unchanged (i.e. the value shall be rounded down).
b) If the last figure to be retained is followed, before rounding, by 5, 6, 7, 8 or 9, it shall be increased by one (i.e. the value shall be rounded up). <\/td>\n<\/tr>\n\n 50<\/td>\n Annex G (informative) Guidance on the scope of type tests
G.1 General
G.2 Invoking of type tests
G.3 Sequential electrical type tests <\/td>\n<\/tr>\n\n 51<\/td>\n G.4 Compatibility test (see 20.14)
G.5 Type tests on components <\/td>\n<\/tr>\n\n 52<\/td>\n G.6 Flame propagation (see 20.15)
G.7 Smoke emission (see 20.16)
G.8 Abrasion test (see 20.17)
G.9 Corrosive and acid gas (see 20.2)
G.10 Change of material
G.11 Evidence of type testing <\/td>\n<\/tr>\n\n 53<\/td>\n Annex H (normative) Thickness measurements
H.1 Sampling
H.2 Procedure
a) for the insulation: the minimum thickness and the maximum thickness;
b) for the separation sheath: the minimum thickness;
c) for the oversheath: the minimum thickness.
Annex I (normative) Test method for cold strippability of the extruded semi-conducting layer of an insulation screen <\/td>\n<\/tr>\n\n 54<\/td>\n Annex J (normative) Method for measurement of resistivity of extruded semi-conducting conductor screen and insulation screen
J.1 Preparation of test pieces
J.2 Procedure <\/td>\n<\/tr>\n\n 55<\/td>\n J.3 Calculations
J.3.1 Conductor screen
J.3.2 Insulation screen <\/td>\n<\/tr>\n\n 56<\/td>\n Figure J.1 Test piece and arrangement of electrodes for measurement of resistivity of the conductor screen <\/td>\n<\/tr>\n \n 57<\/td>\n Figure J.2 Test piece and arrangement of electrodes for measurement of resistivity of the insulation screen
Annex K (normative) Method for measurement of resistivity of lapped inner covering <\/td>\n<\/tr>\n\n 58<\/td>\n Annex L (normative) Wet compatibility test for galvanized steel wires and semi-conducting tape layers
Figure L.1 Test cell for wet compatibility test of galvanized steel wires and semi-conducting tape layers <\/td>\n<\/tr>\n\n 59<\/td>\n Annex M (normative) Abrasion test
Table M.1 Vertical force on cable during abrasion test <\/td>\n<\/tr>\n\n 60<\/td>\n Figure M.1 Abrasion test
Annex N (normative) Test for shrinkage of oversheath on cable
N.1 General
N.2 Selection of samples
N.3 Preparation of test piece <\/td>\n<\/tr>\n\n 61<\/td>\n N.4 Procedure
N.5 Evaluation of results
Annex O (normative) Insulation resistance constant test on oversheath
O.1 Procedure
O.2 Calculation of results <\/td>\n<\/tr>\n\n 62<\/td>\n Bibliography
[1] Conf\u00e9rence Internationale des Grands R\u00e9seaux Electriques. Report 1968-21-01.
[2] Institute of Electrical and Electronics Engineers. Paper No. 69, CP88-PWR. <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"Electric cables. Armoured cables with thermosetting insulation for rated voltages from 3.8\/6.6 kV to 19\/33 kV having low emission of smoke and corrosive gases when affected by fire. Requirements and test methods<\/b><\/p>\n
\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n BSI<\/b><\/a><\/td>\n 2008<\/td>\n 64<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":241646,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[493,2641],"product_tag":[],"class_list":{"0":"post-241641","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-29-060-20","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/241641","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/241646"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=241641"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=241641"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=241641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}