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GB 13140.2-2008: [GB/T 13140.2-2008] Connecting devices for low voltage circuits for household and similar purposes -- Part 2: Particular requirements for connecting devices as separate entities with screw-type clamping units
Status: Valid GB 13140.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB 13140.2-2008 | English | 679 |
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[GB/T 13140.2-2008] Connecting devices for low voltage circuits for household and similar purposes -- Part 2: Particular requirements for connecting devices as separate entities with screw-type clamping units
| Valid |
GB 13140.2-2008
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| GB 13140.2-1998 | English | 719 |
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Connecting devices for low voltage circuits for household and similar purposes. Part 2: Particular requirements for connecting devices as separate entities with screw-type clamping units
| Obsolete |
GB 13140.2-1998
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| GB 13140.2-1995 | English | 399 |
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Connecting devices for household and similar fixed electrical installations. Particular requirements for screwless terminals for connecting copper conductors
| Obsolete |
GB 13140.2-1995
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PDF similar to GB 13140.2-2008
Basic data | Standard ID | GB 13140.2-2008 (GB13140.2-2008) | | Description (Translated English) | [GB/T 13140.2-2008] Connecting devices for low voltage circuits for household and similar purposes -- Part 2: Particular requirements for connecting devices as separate entities with screw-type clamping units | | Sector / Industry | National Standard | | Classification of Chinese Standard | K30 | | Classification of International Standard | 29.120.20 | | Word Count Estimation | 26,276 | | Date of Issue | 2008-12-30 | | Date of Implementation | 2010-02-01 | | Older Standard (superseded by this standard) | GB 13140.2-1998 | | Quoted Standard | GB 13140.1-2008 | | Adopted Standard | IEC 60998-2-1-2002, IDT | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 26 of 2008 (total 139) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard applies to connecting the wires without special treatment with screw-type clamping units connected devices. | GB 13140.2-2008: [GB/T 13140.2-2008] Connecting devices for low voltage circuits for household and similar purposes -- Part 2: Particular requirements for connecting devices as separate entities with screw-type clamping units
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Connecting devices for low voltage circuits for household and similar purposes.Part 2. Particular requirements for connecting devices as separate entities with screw-type clamping units
ICS 29.120.20
K30
National Standards of People's Republic of China
GB 13140.2-2008/IEC 60998-2-1.2002
Instead of. GB 13140.2-1998
Low voltage circuits for household and similar purposes Connecting devices
Part 2. as a standalone unit with screw-type clamping
Particular requirements for connecting devices of
(IEC 60998-2-1.2002, IDT)
Posted 2008-12-30
2010-02-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅰ
IEC Foreword Ⅱ
1 Scope 1
2 Normative references 1
3 Terms and definitions
4 2 General requirements
5 Test General Description 2
6 Key Features 2
7 Category 2
8 signs 2
9 Protection against electric shock 2
10 2 wire connection
11 Structure 6
12 anti-aging, harmful moisture, water and solid foreign objects into the 7
13 Insulation resistance and electric strength 7
14 Mechanical strength 7
15 rise 7
16 Heat 7
17 clearances and creepage distances 7
18 Resistance of insulating material to abnormal heat and fire 7
19 electrically insulating material resistant to tracking 7
20 Electromagnetic compatibility (EMC) requirements 7
Appendix 12
Annex AA (normative) conductor cross-section and test gauge 13
Test procedure Appendix BB (normative) Test to use a set of three groups and the number of samples in each group of 15 samples
Few roots Annex CC (informative) Test the wire 16
Appendix DD (informative) conductor cross-section (mm2) and the relationship between the North American wire gauge AWG wire
Approximate relationship cross-sectional area (mm2) and the North American wire gauge size (AWG) of between 17
Examples Appendix EE (informative) temperature rise test 15.4 18
References 20
GB 13140.2-2008/IEC 60998-2-1.2002
Foreword
All technical content in this Part of GB 13140 is mandatory.
GB 13140 "Connecting devices for low voltage circuits for household and similar purposes with" divided into two parts.
Part 1. General requirements (GB 13140.1)
Part 2. Particular requirements (GB 13140.2 ~ 13140.5)
--- Special requirements as an independent unit with screw-type clamping units for connecting devices
--- As a standalone unit with screwless-type clamping units - Particular requirements for connecting devices
--- As a standalone unit with insulation piercing connection device type clamping units - Particular requirements
--- Particular requirements for twist-on connecting devices
This section GB 13140 Part 2 "as separate entities with screwless-type clamping units for connecting devices of the special requirements" section
Points, numbered GB 13140.2.
This section should be used in conjunction with the GB 13140.1.
This section identical with IEC 60998-2-1.2002 "Household and similar low voltage circuits connected devices - Part 2. As an only
Special requirements "stand with screw-type clamping units for connecting devices of.
This Part replaces GB 13140.2-1998 "Part 2 Connecting devices for low voltage circuits for household and similar purposes used. as an independent single
Special requirements "element with screw-type clamping units for connecting devices.
This section and the main content of GB 13140.2-1998 changes as follows.
1) remove the reference to Chapter 2 standards referenced in IEC publication 228A (1982).
2) remove the wire is defined in Chapter 3, without special treatment.
3) increased 8.101.
4) table 101, table 102, table 103, table 104 increase 0.2mm2,0.34mm2 two kinds of wire sizes and the corresponding test
Claim.
5) increased 10.104 connect different types of test leads.
6) added 10.102 c), d).
7) 10.103,10.104,10.105,10.106 Chapter 15 torque value when tested in selected different tables BB. 1 test sample
Group number changes.
8) Chapter 17. The title change.
9) increase in Chapter 20 [electromagnetic compatibility (EMC) requirements].
10) increase in Appendix DD. 1, Appendix DD. 2 and Appendix EE.
This part of the Appendix AA, BB normative Appendix Appendix Appendix CC, Appendix DD, EE appendix is informative appendix.
This part is proposed by the China Electrical Equipment Industrial Association.
This part of the National Electric annex Standardization Technical Committee (SAC/TC67) centralized.
This section drafted by. China Electric Apparatus Research Institute, Zhejiang Yuehua Telecommunication Co., Ltd., Ningbo Electronics Co., Ltd. Pu speed.
Drafters of this section. Lvguo Wei, Wang Sheng, Lin Chunfang.
This part of the standard replaces the previous editions are.
--- GB 13140.2-1998.
GB 13140.2-2008/IEC 60998-2-1.2002
IEC Foreword
1) The International Electrotechnical Commission (IEC ) is a worldwide standardization group composed of national Electrotechnical Commission (IEC National Committees)
Organizations. The object of IEC is to promote international cooperation in the field of standardization in the electrical and electronic related issues. For this purpose, IEC
In addition to other activities, but also publishes International Standards. Their preparation is entrusted to technical committees to complete.
IEC National Committee members, as long as the interest of standards development, can participate in its development work. Liaising with the IEC States
International, governmental and non-governmental organizations also participate in standards development work. IEC and the World Organization for Standardization (ISO ) in accordance with the agreement
Working closely specified conditions.
2) IEC on technical matters Technical Committee of National Committee is particularly concerned by the participation of all the issues developed by the
The formal decisions or agreements, as expressed consensus on the issues involved in the international arena.
3) The formal decisions or agreements publishing standards, technical reports or guides form and recommended to use internationally, and in this sense
Accepted by the National Committees.
4) In order to promote international unification, IEC National Committees should clearly maximize the IEC international standards into the country
Or regional standards. Between the IEC Standard and the corresponding national or regional standard if there is any difference at the national or local standards
District standards clearly stated.
5) Note that some of the ingredients of this International Standard may be the subject of patent rights. IEC shall have no responsibility to confirm any or all such
patent.
6) IEC did not develop any signs of approval procedure, when a device claims to comply with a particular standard of IEC , IEC which is not
Any responsibility.
IEC 60998-2-1 standard by the IEC 23 (electrical accessories) Technical Committee 23F (connecting devices) Technical Committee to develop.
The second edition of this part of the first edition of 1990 substituted, constitutes a technical revision.
This section has guidelines according to IEC 104 Safety Standards Series.
This section is based on the following documents.
FDIS Report on voting
23F/142/FDIS 23F/148/RVD
Details of the voting section, see the report on the voting results listed in Table of.
This section has been drafting Part 2 according to ISO /IEC Guide.
The parts IEC 60998 series of standards Part 2-1 series of standards for the common name for low voltage circuits for household and similar purposes
Connecting devices. This series consists of Part 1 (General requirements) and the respective Part 2 (Special requirements) components.
When this part of the publication, some of the following have been published.
--- Part 1. General requirements;
--- Part 2-1. as a standalone unit with screw-type clamping units - Particular requirements for connecting devices;
--- Part 2-2. as a standalone unit with screwless - type clamping member special requirements for connecting devices;
--- Part 2-3. as a standalone unit with the special requirements of insulation piercing clamping units for connecting devices;
--- Part 2-4. Particular requirements for twist - on connecting devices.
This section should be used in conjunction with IEC 60998-1. Constitute the standard version 2 (2002).
Supplement or modify the corresponding provisions of IEC 60998-1, thereby making IEC standard. as a standalone unit with screw-type clamping units
Particular requirements for connecting devices.
Where there is no chapter in this section of Part 1 article specifically mentioned are applicable. Where specified in this standard are. "Add", "Edit"
"Replacement" of content, Part 1 of the technical requirements, test specifications or comments should do the appropriate changes.
GB 13140.2-2008/IEC 60998-2-1.2002
a) using the following printed in this section.
--- Requirements. roman;
--- Test specifications. italic;
--- Note. The small Roman font.
b) with respect to the first part of the increase is limited to the terms and graphics are numbered starting from 101, appendix with the letters AA, BB, etc. represent.
The Committee decided that the contents of this section in 2010 will remain the same, then this part will.
● reaffirmation;
● abolished;
● replaced by a revised edition; or
● Added.
GB 13140.2-2008/IEC 60998-2-1.2002
Low voltage circuits for household and similar purposes Connecting devices
Part 2. as a standalone unit with screw-type clamping
Particular requirements for connecting devices of
1 Scope
GB 13140.1-2008 this chapter to make changes after the following apply.
increase.
GB 13140 This part also applies to connecting devices connecting wires without special handling with screw-type clamping units on.
2 Normative references
The following documents contain provisions which, through reference in this Part of GB 13140, constitute provisions of this part. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
GB 13140.1-2008 applicable.
3 Terms and Definitions
GB 13140.1-2008 this chapter make the following changes after apply.
increase.
3.101
Connect two or more wires through the screw-type terminal clamp.
3.101.1
Insert the wires into the holes or slots and clamped under the end of the screw terminals. Clamping pressure may be applied directly by the end of the screw or by subject
Middle to end of the screw clamp pressure is applied.
Note. Examples of columnar terminal 101 shown in Fig.
3.101.2
Clamping the wires in one or more of the head of the screw terminals. Clamping pressure may be applied directly by the head of the screw or through an intermediate
Clamping member, such as washers, clamping plates or locking member of the class to be applied.
Note. Examples of screw terminals are shown in Figure 102.
3.101.3
The wire clamp nut at the following terminals, clamping pressure may be applied directly or via a properly processed by forming a nut
Between the clamping member, such as a washer, clamping plate or the locking member or the like is applied.
Note. Examples of screw terminals 102 shown in Fig.
3.101.4
By two or more screws or nuts to clamp the conductor sheet under the saddle shaped terminal.
Note. Examples of saddle terminals are shown in Figure 103.
GB 13140.2-2008/IEC 60998-2-1.2002
3.101.5
Clamped by a nut wire terminal screw groove bottom. In this terminal, through the nut following the shape properly processed
Washer or center pin (such as nuts are cap nuts) or delivered to the equivalent member groove on the wire by the pressure of the nut can be caught in the spiral wire
Plug the bottom.
Note. Examples of Bell-type terminal 104 shown in Fig.
4 General requirements
GB 13140.1-2008 applicable.
5 general description of the test
GB 13140.1-2008 this chapter to make changes after the following apply.
5.3 Replacement.
The test shall be in accordance with Appendix BB listed in order of each test specimen were.
5.4 The first sentence is replaced by the following.
The test shall be to the order of each sample were prescribed.
Appendix BB sample packet of a test of all related projects, if all tests are met, then meet the standards.
6 Key Features
GB 13140.1-2008 applicable.
Category 7
GB 13140.1-2008 applicable.
8 flag
GB 13140.1-2008 this chapter make the following changes after apply.
8.1 Addition.
If applicable, the terminal shall 10.103 mark.
increase.
8.101 If the manufacturer's declaration, the terminals can be more than the minimum requirements of 10.101 and 10.102, and technical information should or catalog, or package
Clearly marked on attachments can take the maximum and minimum cross-sectional area of the wire, and the wire each clamping member can pick up the number.
9 Protection against electric shock
GB 13140.1-2008 applicable.
10 wire connection
GB 13140.1-2008 this chapter to make changes after the following apply.
increase.
10.101 terminals should be connected to the root of the same or different nominal cross two or more wires or components. The terminal should be able to connect the hard and/or without
Soft wire special treatment.
10.102 Each terminal should be connected to the connection table 101 is related to the nominal capacity value and a predetermined cross-sectional area of the wire and the like. In addition,
It should also be capable of connecting the two terminals of the adjacent smaller cross-sectional area of the wire, for example.
GB 13140.2-2008/IEC 60998-2-1.2002
a) rated connecting capacity terminals 1mm2 should be able to reliably connect a 0.5mm2,0.75mm2 1mm2 and hard and/or
Soft wire.
b) rated connecting capacity of the terminal 10mm2 should be securely clamped 4mm2,6mm2 and 10mm2 hard wire and/or
4mm2 and 6mm2 flexible wire.
Wire list 101 rated connecting capacity and connectable
Rated connecting capacity /
mm2
Its theoretical diameter of the wire can be connected
Hard wire soft wire
Conductor cross-section /
mm2
Single solid Φ /
mm
Strand Φ /
mm
Conductor cross-section /
mm2
Φ /
mm
0.2
0.34
0.5
0.75
1.0
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
0.2
0.34
0.5
0.75
1.0
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
0.51
0.63
0.9
1.0
1.2
1.5
1.9
2.4
2.9
3.7
4.6
0.53
0.66
1.1
1.2
1.4
1.7
2.2
2.7
3.3
4.2
5.3
6.6
7.9
0.2
0.34
0.5
0.75
1.0
1.5
2.5
4.0
4.0
6.0
10.0
16.0
25.0
0.61
0.8
1.1
1.3
1.5
1.8
2.3a
2.9a
2.9a
3.9
5.1
6.3
7.8
Note 1. The maximum hard wire and soft wire diameter to GB/T 3956-1997 and GB/T 18213-2000 Table 1 is based. While AWG wire,
Is based ASTMB172-71, ICEA Publication S-19-81, ICEA Publication S-66-524 and ICEA S-65-516 based publications. 1)
Note 2. The AWG in the corresponding table in Appendix DD DD. 2 below. 2)
According to a GB/T 3956-1997, which is only 5 type flexible wire sizes.
1), 2) the present note is given only to foreign-related information.
3) IEC standard no original letter r, f, where the letter "r" marked hard wire, "f" Flag soft wire.
c) rated connecting capacity of the terminal 25mm2 should be securely clamped 10mm2,16mm2 and 25mm2 hard wire and/or
6mm2,10mm2 and 16mm2 flexible wires.
d) rated connecting capacity flexible conductor 25mm2 terminals should be securely clamped 10mm2,16mm2 soft and 25mm2
wire.
10.103 unless the manufacturer otherwise specified, the terminal should be able to connect table 101 "wires can be connected" column corresponding to its rated connection
Capacity hard wire and soft wire, in this case, without any signs. If the terminal is only one type of connection wire [for example, hard
Conductor (r) or soft wire (f)] 3), then for the sake of the connection should be in the final product clearly with the letter "r" or "f" marked, or at most
Clearly indicate the technical data and product catalog or on small packages.
And by observing the following tests to verify compliance with the requirements of 10.101 - 10.103.
Conduct tests in connection terminals specified in 10.102 copper wire, wire maximum and minimum diameters are alternately connected to each clamping
Member in.
With a suitable screwdriver or wrench to tighten the screws and nuts and loosen all five times, with the tightening torque is equal to the corresponding column to the table 102
GB 13140.2-2008/IEC 60998-2-1.2002
Torque value or the value specified by the manufacturer, whichever is greater value.
After each Loosen the screws or nuts, are required to insert a new conductor.
Table 102 torque and the nominal diameter of the screw
The nominal diameter of the screw /
mm
Greater than or equal to
Torque /
Nm
Ⅰ Ⅱ Ⅲ Ⅳ
1.6
2.0
2.8
3.0
3.2
3.6
4.1
4.7
5.3
6.0
8.0
10.0
12.0
1.6
2.0
2.8
3.0
3.2
3.6
4.1
4.7
5.3
6.0
8.0
10.0
12.0
15.0
0.05
0.1
0.2
0.25
0.3
0.4
0.7
0.8
0.8
1.2
2.5
1.2
1.2
1.4
1.8
2.5
3.5
4.0
5.0
0.1
0.2
0.4
0.5
0.6
0.8
1.2
1.8
2.0
2.5
3.5
4.0
0.1
0.2
0.4
0.5
0.6
0.8
1.2
1.8
2.0
3.0
6.0
10.0
1.2
1.8
2.0
3.0
4.0
6.0
8.0
10.0
Note. Ⅰ column applies to tighten the screws is not out of the headless screws screw holes, but also to not be wider than the diameter of the screw with a screwdriver to tighten the other
Screws.
Ⅱ column applies a screwdriver to tighten the cap nut terminals.
Ⅲ column applies to other screws with a screwdriver to tighten the terminal.
Ⅳ column applies to the non-use tools other than a screwdriver to tighten the hood-type terminals except the screws and nuts.
Ⅴ column applies to tools other than the addition screwdriver to tighten the cap nut terminals.
Where the screw is a hexagon slotted screw head, and the value of Ⅲ and Ⅳ bar and bar are different, the tests should be performed twice, first in a group of three
Performed on the sample, applying a torque to the hex head screws Ⅳ column specified, then, in the three samples was another group with a screwdriver applied Ⅲ
Column specified torque. If the value of Ⅲ and Ⅳ column column are the same, you only need to use a screwdriver to do the test.
Wire clamp screws and nuts shall have a metric thread or similar thread pitch and mechanical strength.
Note. Currently, SI (International System of Units) thread, BA (American Association) threads and UN (unified) threads are regarded as the pitch of the propeller can be used with the meter and mechanical strength
ISO thread made a similar thread. 4)
During the test, shall not affect the re-use terminal damage, such as breakage of screws or head slots, threads, washers or U-shaped cards
Damage.
4) The injection is given only to foreign-related information.
Provisions cover terminals nominal diameter, that nominal diameter slotted bolt.
Test with a screwdriver blade shape must be adapted to test the screw head. Smooth application of torque tightening screws and nuts.
10.104 tested on three new samples, each clamping member connected to the number specified by the manufacturer of wire, wire cross-sectional area and the type of installation and
GB 13140.2-2008/IEC 60998-2-1.2002
In the device 105 shown in FIG.
Subjected to the following tests on each new sample.
a) The finest wire cross-sectional area of the least number of roots;
b) conductor cross-sectional area of the thickest least number of roots;
If applicable.
c) the smallest wire cross-sectional area of the maximum number of roots;
d) the maximum cross-sectional area of the thickest wire number;
e) the smallest cross-sectional area and cross-sectional area of the wire up to the number of the thickest wire connected to the clamping member.
Table Relationships 103 weight mass, height and conductor cross-section between the
Conductor cross-section /
mm2
Sleeve aperture a /
mm
Height b /
mm
The conductor corresponding to the weight /
kg
0.2
0.34
0.5
0.75
1.0
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
6.4
6.4
6.5
6.5
6.5
6.5
9.5
9.5
9.5
9.5
13.0
13.0
14.5
0.2
0.2
0.3
0.4
0.4
0.4
0.7
0.9
1.4
2.0
2.9
4.5
6.8
Note 1. Appendix DD gives the approximate relationship between mm2 and AWG.
Note 2. In the United States, using a higher weight value. 5)
If a sleeve aperture is too small, do not twist the core of a bundle of wires can not pass through it, the choice of a bigger aperture sleeve.
b height H tolerance. ± 15mm.
5) The note gives only foreign-related information.
Note 1. c), d), e) and a), b) wire cross-sectional area shown may be different.
Note 2. Device-integrated clamping member, does not have to provide the entire device.
Cable length test should provide more than 103 table height (H) long 75mm. Then, the test conductor is connected to the clamping member, with
10.103 predetermined torque clamping screws or nuts are tightened.
The wire ends through a fastening plate casing sizes with corresponding fastening plate located at the test unit height (H) in a predetermined table 103
Plane. Sleeve, which is the horizontal plane, so that it can make the center line and a diameter of concentric circles about the clamp member, the fastening plate of 75mm
A horizontal plane at a rate of (10 ± 2) r/min rotation.
From the mouth of the clamping member on the surface of the sleeve in the table should be between 103 within the specified height 15mm range. The sleeve can be lubricated
Oil insulated wire to prevent knotting, twisting or rotating.
At the end of wire suspension table weight 103 prescribed test duration 15min.
During the test, the conductor shall neither slide nor clamp in the clamp near the fracture, but also not to damage within the meaning of this standard
"Can not use the" level.
GB 13140.2-2008/IEC 60998-2-1.2002
After 10.105 10.104 test, tension table 104 shown applied to the subjected to the test of each wire. If clamping screw or screw
Mother, shall not this test and tighten. Smooth slow towards the axial leads urging 1min. During the test, the wire should not be released from the terminal.
Table 104 relationship between tension and cross-sectional area
Conductor cross-section /
mm2
pull/
Conductor cross-section /
mm2
pull/
Conductor cross-section /
mm2
pull/
0.2 10 1.5 401 090
0.34 15 2.5 5,016,100
0.5 2046025135
0.75 3068035190
1.0 35 - - - -
Note 1. Appendix DD gives the approximate relationship between mm2 and AWG.
Note 2. In the US, the use of higher tensile values. 6)
6) The injection is given only to foreign-related information.
7) IEC 61545.1996 Connecting devices in any material clamp aluminum wire and aluminum body of the clamp connecting devices for copper conductors.
10.106 terminal table 101 specified type and nominal cross-sectional area of the wires to form the wire core should be in accordance with Table CC. 1 (in line with
GB/T 3956-1997).
Before wire into the terminal, set hard wires and flexible stranded wire conductor reshaped. It allows the use of tools.
It should not require excessive force will be able to insert the wire in the terminal.
The wire is inserted into the terminal, the plug should be possible to extend from the other side of the terminal, and in the most easy to make the wire coming off position.
According to a predetermined torque 10.103 clamping screw tightened.
After the test, the wire does not emerge from the wire terminal.
11 Structure
GB 13140.1-2008 this chapter to make changes after the following apply.
11.2 Replacement.
Clamping member in the design and structure should be able to do the wires firmly clamped between metal surfaces.
Checked by inspection and 10.101, and 10.103.
increase.
11.101 indicated ground screws or nuts should be fully locked to prevent accidental loosening, and should be without tools can not make it loose.
In general, the view of a clamping member shown in FIG. 101 to 104 as long as passing the test in this section, it is in line with the requirements of this section.
Note. If the final product is expected to be subject to periodic vibration or temperature change, then you need to install a resilient element (for example. pressure plate).
11.102 wire clamp screws and nuts, or even be able to locate the terminal to prevent its rotation, nor to fix any other component.
Compliance is checked by inspection checks.
Screws should not be soft or deformable metal, such as zinc or aluminum.
NOTE. If you are using aluminum alloy aluminum screw terminals, will have additional testing, the additional reference test IEC 615457).
11.103 terminals shall be so designed and constructed for stranded condu...
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