Thermocouples - Part 3: Extension and compensating cables - Tolerances and identification system

IEC 60584-3:2021 It is necessary for thermocouple temperature measurement that the electro-motive force (abbreviated as e.m.f. hereafter) of the thermocouple circuit is precisely measured by a measuring instrument. A thermocouple is electrically connected to the instrument by a proper pair of electric cables. IEC 60584-3:2021 standardizes these cables. It specifies identification and manufacturing tolerances for extension and compensating cables (mineral insulated extension and compensating cables are not included) provided directly to users of industrial processes. These tolerances are determined with respect to the e.m.f. ver-sus temperature relationship of IEC 60584-1. The requirements for extension and compensating cables for use in industrial process control are specified.

Couples thermoélectriques - Partie 3: Câbles d'extension et de compensation - Tolérances et système d'identification

IEC 60584-3:2021 Pour le mesurage de la température des couples thermoélectriques, il est nécessaire que la force électromotrice du circuit des couples thermoélectriques soit mesurée de manière précise à l'aide d'un appareil de mesure. Un couple thermoélectrique est relié électriquement à l'appareil de mesure au moyen d'une paire de câbles électriques appro-priée. L'IEC 60584-3:2021 normalise ces câbles. Elle spécifie les tolérances pour la fabrica-tion et l'identification des câbles d'extension et de compensation (autres que les câbles d'extension et de compensation à isolation minérale) fournis directement aux utilisateurs de procédés industriels. Ces tolérances sont déterminées par rapport à la relation force électromotrice - température établie dans l'IEC 60584­1. Les exigences relatives aux câbles d'extension et de compensation destinés à être utilisés dans le cadre de la com-mande des processus industriels sont spécifiées.

General Information

Status
Published
Publication Date
15-Feb-2021
Current Stage
PPUB - Publication issued
Completion Date
16-Feb-2021
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IEC 60584-3
Edition 3.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Thermocouples –
Part 3: Extension and compensating cables – Tolerances and identification
system
Couples thermoélectriques –
Partie 3: Câbles d'extension et de compensation – Tolérances et système
d'identification
IEC 60584-3:2021-02(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60584-3
Edition 3.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Thermocouples –
Part 3: Extension and compensating cables – Tolerances and identification
system
Couples thermoélectriques –
Partie 3: Câbles d'extension et de compensation – Tolérances et système
d'identification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.200.20 ISBN 978-2-8322-9392-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60584-3:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 5

4 General ........................................................................................................................... 6

5 Tolerance values ............................................................................................................. 6

6 Colour coding .................................................................................................................. 7

6.1 Negative conductor ................................................................................................. 7

6.2 Positive conductor .................................................................................................. 7

6.3 Outer sheath ........................................................................................................... 7

6.4 Connectors ............................................................................................................. 7

7 Dimensions...................................................................................................................... 7

8 Requirements .................................................................................................................. 9

8.1 Materials ................................................................................................................. 9

8.1.1 Insulating materials ......................................................................................... 9

8.1.2 Conductor materials......................................................................................... 9

8.2 Electromagnetic shielding ....................................................................................... 9

8.3 Capacitance and inductance ................................................................................... 9

8.4 Resistance of positive or negative conductor and loop resistance of a cable ........... 9

8.5 Insulation resistance ............................................................................................. 10

8.6 Dielectric strength ................................................................................................. 10

9 Identification and shipping form ..................................................................................... 10

9.1 Additional identification ......................................................................................... 10

9.2 The shipping form and further information ............................................................. 10

Annex A (informative) Examples for forms and sizes other than wires and stranded

wires ..................................................................................................................................... 11

Table 1 – Tolerance classes for extension and compensating cables ...................................... 6

Table 2 – Colour code of positive conductor insulation for extension and compensating

cables ..................................................................................................................................... 7

Table 3 – Nominal diameters of typical single strand (solid) wires ........................................... 8

Table 4 – Constructions and typical nominal cross-sectional area of multi-stranded

wires ....................................................................................................................................... 8

Table A.1 – Rods .................................................................................................................. 11

Table A.2 – Flat wires ........................................................................................................... 11

Table A.3 – Strips ................................................................................................................. 11

---------------------- Page: 4 ----------------------
IEC 60584-3:2021 © IEC 2021 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
THERMOCOUPLES –
Part 3: Extension and compensating cables –
Tolerances and identification system
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote interna-

tional co-operation on all questions concerning standardization in the electrical and electronic fields. To this

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tional Organization for Standardization (ISO) in accordance with conditions determined by agreement between

the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all inter-

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services carried out by independent certification bodies.

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tions.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60584-3 has been prepared by subcommittee 65B: Measurement

and control devices, of IEC Technical Committee 65: Industrial-process measurement, control

and automation.

This third edition cancels and replaces the second edition issued in 2007. This edition consti-

tutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) revision of tolerance values to take recent technological advancement into account,

b) addition of new colour coding for the thermocouple Type C and A in response to the newly

revised IEC 60584‑1 Edition 3: 2013,

c) creation of an annex to provide examples of sizes for the rod, flat wire and strip of the

compensating and extending conductors for thermocouples.
---------------------- Page: 5 ----------------------
– 4 – IEC 60584-3:2021 © IEC 2021
The text of this International Standard is based on the following documents:
FDIS Report on voting
65B/1189/FDIS 65B/1191/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, availa-

ble at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

A list of all parts of the IEC 60584 series, under the general title Thermocouples, can be

found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 60584-3:2021 © IEC 2021 – 5 –
THERMOCOUPLES –
Part 3: Extension and compensating cables –
Tolerances and identification system
1 Scope

It is necessary for thermocouple temperature measurement that the electro-motive force (ab-

breviated as e.m.f. hereafter) of the thermocouple circuit is precisely measured by a measur-

ing instrument. A thermocouple is electrically connected to the instrument by a proper pair of

electric cables. IEC 60584-3 standardizes these cables. It specifies identification and manu-

facturing tolerances for extension and compensating cables (mineral insulated extension and

compensating cables are not included) provided directly to users of industrial processes.

These tolerances are determined with respect to the e.m.f. versus temperature relationship of

IEC 60584-1. The requirements for extension and compensating cables for use in industrial

process control are specified.

Extension and compensating cables may consist of a single strand (solid) wire or multi-

stranded wire for which this document is applied. Specification for extension and compensat-

ing conductors of forms of rods, flat wires or strips can be established by agreement between

suppliers and users.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their con-

tent constitutes requirements of this document. For dated references, only the edition cited

applies. For undated references, the latest edition of the referenced document (including any

amendments) applies.
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following ad-

dresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
extension cables

cables manufactured from conductors having the same nominal composition as those of the

corresponding thermocouple

Note 1 to entry: The cables are designated by the letter "X" following the designation of the thermocouple, for

example "JX".
3.2
compensating cables

cables manufactured from conductors having a composition different from the corresponding

thermocouple
---------------------- Page: 7 ----------------------
– 6 – IEC 60584-3:2021 © IEC 2021

Note 1 to entry: The cables are designated by the letter "C" following the designation of the thermocouple, for

example "KC". In some cases, different tolerances apply for the same thermocouple type over different temperature

ranges. These are distinguished by additional letters such as, for example, RCA and RCB.

3.3
tolerance

maximum allowable deviation in microvolts caused by the introduction of the extension or

compensating cable into the measuring circuit
4 General

Both extension and compensating cables are used for the electrical connection between the

open ends of a thermocouple and the reference junction in those installations where the con-

ductors of the thermocouple are not directly connected to the reference junction. A cable al-

ways consists of a specific pair (negative and positive conductor), to be connected to the cor-

responding thermocouple. The thermoelectric properties of extension and compensating ca-

bles shall be close to the properties of the corresponding thermocouple. Products are manu-

factured for each thermocouple type, using various alloy formulations for various purposes.

The key characteristic is that the pair of conductors meets the specified e.m.f. tolerance re-

quirements.
5 Tolerance values

Table 1 shows the specified tolerance for extension and compensating cables when used at

temperatures within the ranges indicated as "temperature range of validity". Temperature

range of validity can be restricted to figures lower than those shown in the table because of

temperature limitations imposed by the insulant.
Table 1 – Tolerance classes for extension and compensating cables
Tolerance class Measuring
Type Temperature range of validity junction
1 2
temperature
JX ±85 µV (±1,5 °C) ±140 µV (±2,5 °C) −25 °C to +200 °C 500 °C
TX ±30 µV (±0,5 °C) ±60 µV (±1,0 °C) −25 °C to +100 °C 300 °C
EX ±120 µV (±1,5 °C) ±200 µV (±2,5 °C) −25 °C to +200 °C 500 °C
KX ±60 µV (±1,5 °C) ±100 µV (±2,5 °C) −25 °C to +200 °C 900 °C
NX ±60 µV (±1,5 °C) ±100 µV (±2,5 °C) −25 °C to +200 °C 900 °C
KCA ±60 µV (±1,5 °C) ±100 µV (±2,5 °C) 0 °C to +200 °C 900 °C
KCB ±60 µV (±1,5 °C) ±100 µV (±2,5 °C) 0 °C to +100 °C 900 °C
NC ±60 µV (±1,5 °C) ±100 µV (±2,5 °C) 0 °C to + 200 °C 900 °C
RCA ±20 µV (±1,5 °C) ±30 µV (±2,5 °C) 0 °C to +100 °C 1 000 °C
RCB ±30 µV (±2,5 °C) ±60 µV (±5,0 °C) 0 °C to +200 °C 1 000 °C
SCA ±20 µV (±1,5 °C) ±30 µV (±2,5 °C) 0 °C to +100 °C 1 000 °C
SCB ±30 µV (±2,5 °C) ±60 µV (±5,0 °C) 0 °C to +200 °C 1 000 °C
BC ±40 µV (±3,5 °C) 0 °C to +100 °C 1 400 °C
CC ±110 µV (±8,0 °C) 0 °C to +200 °C 1 800 °C
ACA ±40 µV (±3,5 °C) 0 °C to +100 °C 1 800 °C
ACB ±70 µV (±5,0 °C) 0 °C to +200 °C 1 800 °C

NOTE Tolerances are specified in microvolts. The table also includes, in parentheses, the approximate equiva-

lent tolerances in degrees Celsius. Because thermocouple e.m.f. temperature relationships are non-linear, the

tolerance in degrees Celsius depends on the temperature of the measuring junction of the thermocouple where

the reference junction is 0 °C. The figures shown in the table are those appropriate to the measuring junction

temperatures in the final column. In all cases, the deviations (expressed in degrees Celsius) are different at

lower temperatures.
---------------------- Page: 8 ----------------------
IEC 60584-3:2021 © IEC 2021 – 7 –

A cable comprising two copper conductors may be used with Type B thermocouples. The ex-

pected maximum additional deviation within the cable temperature range 0 °C to +100 °C is

40 μV. The equivalent in temperature is 3,5 °C when the measuring junction of the thermo-

couple is at 1 400 °C.
6 Colour coding
6.1 Negative conductor

The insulation of the negative conductor shall be coloured in WHITE for all thermocouple

types.
6.2 Positive conductor

The insulation of the positive conductor shall be coloured correspondingly to the thermocou-

ple as indicated in Table 2.
6.3 Outer sheath

The outer sheath, if any, shall be coloured as indicated in Table 2. The outer sheath, if any,

shall be colored as given in Table 2. In the case of possible confusion with existing IEC color

code specification of cables, the color shall be indicated by other means, for instance by put-

ting a label, tag or sticker of the specified color in the Table 2.
Table 2 – Colour code of positive conductor insulation
for extension and compensating cables
Colour of positive conductor
Thermocouple type
and sheath insulation
T Brown
E Purple
J Black
K Green
N Pink
B Grey
R Orange
S Orange
C Red
A Dark blue
6.4 Connectors

The connectors, if any, used in conjunction with thermocouples and compensating or exten-

sion cables, shall be coloured as indicated in Table 2. The colouring may be a mass colouring

or a coloured dot on the connector’s surface.
7 Dimensions

The dimensions of conductors of cables should be agreed between supplier and user taking

into account, for example, the tensile strength and flexibility of the cable. Table 3 shows typi-

cal examples of nominal diameter of single strand (solid) wires. Table 4 shows typical exam-

ples of constructions of multi-stranded wires and estimated total cross-sectional areas of the

---------------------- Page: 9 ----------------------
– 8 – IEC 60584-3:2021 © IEC 2021

conductors. The form of the conductors can be rods, flat wires and strips, and examples of

their sizes are shown in Annex A.
Table 3 – Nominal diameters of typical single strand (solid) wires
Nominal diameter of single strand (solid) wire
0,10
0,12
0,18
0,20
0,30
0,32
0,40
0,45
0,50
0,60
0,63
0,64
0,65
0,80
0,81
1,00
1,25
1,29
1,295
1,38
1,60
Table 4 – Constructions and typical nominal
cross-sectional area of multi-stranded wires (1 of 2)
Nominal total cross- Construction
sectional area
number of strands × diameter of
a strand in mm
0,05 7 × 0,10
0,11 12 × 0,12
7 × 0,20
0,22
3 × 0,30
0,38 12 × 0,20
0,41 13 × 0,20
16 × 0,20
0,50
7 × 0,30
0,60 19 × 0,20
0,72 23 × 0,20
0,75 24 × 0,20
---------------------- Page: 10 ----------------------
IEC 60584-3:2021 © IEC 2021 – 9 –
Nominal total cross- Construction
sectional area
number of strands × diameter of
a strand in mm
11 × 0,30
32 × 0,20
14 × 0,30
1,00 7 × 0,44
5 × 0,50
3 × 0,65
7 × 0,45
1,20
4 × 0,60
1,25 4 × 0,63
1,30 4 × 0,65
48 × 0,20
21 × 0,30
1,50
7 × 0,52
3 × 0,80
16 × 0,40
2,00
7 × 0,60
2,20 7 × 0,63
2,25 7 × 0,64
2,30 7 × 0,65
8 Requirements
8.1 Materials
8.1.1 Insulating materials
The choice of insulating materials shall be agreed between supplier and user.
8.1.2 Conductor materials

For the cable temperature range, the thermal e.m.f. of conductor materials of a cable shall

comply both with IEC 60584-1 and with the tolerances specified in Clause 5 of this document.

8.2 Electromagnetic shielding

To reduce the EMC interference, cables shall be manufactured by using pairs of twisted con-

ductors, and additional shielding can be used for a thermoelectric circuit.
8.3 Capacitance and inductance

The capacitance and inductance – both per metre – (conductors against conductors and con-

ductors against shield – if present) shall be made available.
8.4 Resistance of positive or negative conductor and loop resistance of a cable

The nominal value of the resistance of positive or negative conductors in Ω/m at (20 ± 5) °C

shall be declared by the manufacturer and the nominal loop resistance in Ω/m at (20 ± 5) °C

shall be made available.
---------------------- Page: 11 ----------------------
– 10 – IEC 60584-3:2021 © IEC 2021
8.5 Insulation resistance
3 9

The minimum insulation resistance shall be 5 MΩ·km (5 × 10 MΩ·m = 5 ×10 Ω·m) for cables

with fibrous insulation and 500 MΩ·km (0,5 × 10 MΩ·m) for all other cables within the scope

of this document. The total electrical requirements of the system may take precedence over

this specification. For fibrous insulation, the insulation resistance specification shall be met at

the time of manufacturing. To maintain the specified insulation resistance, user shall store in

clean and dry condition.

The insulation resistance shall be measured between each conductor and all the other con-

ductors and shield. Test voltage shall be (500 ± 50) V DC and environmental conditions shall

be a temperature of (20 ± 15) °C and a relative humidity of less than 85 % (non-condensing).

8.6 Dielectric strength

A voltage of 500 V AC shall be applied for 1 min each time at ambient conditions between:

a) each conductor separately and all the others connected together,
b) all conductors and the shielding.
No breakdown shall occur during this test.
9 Identification and shipping form
9.1 Additional identification

The primary identification is the colour coding in Table 2. Additional identification shall be ap-

plied by the manufacturer.
Example 1 – single strand (solid) wire; IEC – KCA – 1 – 0,65– 2P.
Where

Symbol of IEC compliance – Type – Tolerance class – Cross-sectional area in mm – Number

of pairs in a cable.
Example 2 – multi-stranded wire; IEC – KCB – 2 – 0,5 ( 7 × 0,3 ).
Where

Symbol of IEC compliance – Type – Tolerance class – Total cross-sectional area in mm

(number of strands x diameter of a strand in mm) – 1p.
In the case of a single pair, the last part can be omitted like in Example 2.
9.2 The shipping form and further information

Shipping form shall be chosen appropriately, i.e. coil, drum, package, etc. If applicable, it is

fitted with the following information in addition to the information specified in 9.1:

• traceable identification number,
• length in m and/or quantity of cables,
• insulating material.
Some or all of this information may be in code form.
---------------------- Page: 12 ----------------------
IEC 60584-3:2021 © IEC 2021 – 11 –
Annex A
(informative)
Examples for forms and sizes other than wires and stranded wires
Extensions and compensating conductors of forms of rod, flat wire and strip:

For rods, typical diameters are shown in Table A.1. For flat wires, typical cross-sectional sizes

are shown Table A.2. For strips, typical cross-sectional sizes are shown in mm.
Table A.1 – Rods
Cross sectional dimension (diameter in mm)
4,00 4,70 6,00 7,00 8,00 9,00 10,0 12,0
Table A.2 – Flat wires
Cross sectional dimension (width/thickness in mm)
6,00 / 0,30 8,00 / 0,60 6,00 / 0,80 8,00 / 0,80 2,00 / 1,70
Table A.3 – Strips
Cross sectional dimension (width/thickness in mm)
40,0 / 0,25 10,0 / 0,40 12,0 / 0,50 40,0/ 0,50 30,0/ 0,70 52,0 / 0,80
___________
---------------------- Page: 13 ----------------------
– 12 – IEC 60584-3:2021 © IEC 2021
SOMMAIRE

AVANT-PROPOS .................................................................................................................. 13

1 Domaine d’application ................................................................................................... 15

2 Références normatives .................................................................................................. 15

3 Termes et définitions ..................................................................................................... 15

4 Généralités .................................................................................................................... 16

5 Valeurs de tolérance ..........................................................

...

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