Electromagnetic characteristics of linear cable management systems (CMS)

This Technical Report provides test methods for the measurement of the following electromagnetic characteristics of lengthwise cable management systems like conduit systems according to EN 61386 series, cable trunking systems and cable ducting systems (CTS/CDS) according to EN 50085 series and cable tray and cable ladder systems according to EN 61537: 1) Shielding effectiveness of magnetic field, 2) Transfer impedance. This Technical Report also provides guidance on how these characteristics can be declared.

Elektromagnetische Eigenschaften von linearen Kabelführungssystemen

Rapport Technique - Caractéristiques électromagnétiques des systèmes linéaires de câblage

Elektromagnetne karakteristike linearnega sistema za urejanje okablenja (CMS)

To tehnično poročilo določa preskusne metode za merjenje naslednjih elektromagnetnih karakteristik vzdolžnih sistemov za urejanje okablenja, kot so sistemi kanalov v skladu s skupino standardov EN 61386, sistemi kabelskih korit in sistemi kabelskih cevi (CTS/CDS) v skladu s skupino standardov EN 50085 ter sistemi polic in lestvic v skladu s standardom EN 61537:
1) zaščitna učinkovitost magnetnega polja,
2) prehodna impedanca.
To tehnično poročilo vsebuje tudi smernice za navajanje teh karakteristik.

General Information

Status
Published
Publication Date
16-Mar-2017
Current Stage
6060 - Document made available
Due Date
17-Mar-2017
Completion Date
17-Mar-2017

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SLOVENSKI STANDARD
SIST-TP CLC/TR 50659:2017
01-maj-2017
Elektromagnetne karakteristike linearnega sistema za urejanje okablenja (CMS)
Electromagnetic characteristics of linear cable management systems (CMS)

Rapport Technique - Caractéristiques électromagnétiques des systèmes linéaires de

câblage
Ta slovenski standard je istoveten z: CLC/TR 50659:2017
ICS:
29.120.10 ,QãWDODFLMVNHFHYL]D Conduits for electrical
HOHNWULþQHQDPHQH purposes
SIST-TP CLC/TR 50659:2017 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP CLC/TR 50659:2017
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SIST-TP CLC/TR 50659:2017
TECHNICAL REPORT CLC/TR 50659
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
March 2017
ICS 29.120.10
English Version
Electromagnetic characteristics of linear cable management
systems (CMS)

Rapport Technique - Caractéristiques électromagnétiques Elektromagnetische Eigenschaften von linearen

des systèmes linéaires de câblage Kabelführungssystemen
This Technical Report was approved by CENELEC on 2017-03-06.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. CLC/TR 50659:2017 E
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Contents Page

European foreword ................................................................................................................................ 3

1 Scope ................................................................................................................................................ 4

2 Normative references ...................................................................................................................... 4

3 Terms and definitions ...................................................................................................................... 4

4 Shielding effectiveness of magnetic field ..................................................................................... 5

5 Transfer impedance ....................................................................................................................... 16

Annex A (informative) Example of calculation of the reduction of distance required between

parallel power cables and signal cables provided by a cable management system .................... 24

Bibliography ......................................................................................................................................... 27

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European foreword

This document (CLC/TR 50659:2017) has been prepared by CLC/TC 213, “Cable management

systems”.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

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

This Technical Report provides test methods for the measurement of electromagnetic characteristics of

linear Cable Management Systems (CMS).

This is a European Technical Report for cable management products used for electro-technical

purposes. It relates to the Council Directives on the approximation of laws, regulations and

administrative provisions of the Member States relating to Low Voltage Directive 2014/35/EU through

consideration of the essential requirements of this Directive.

This European Technical Report is supported by separate standards to which references are made.

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1 Scope

This Technical Report provides test methods for the measurement of the following electromagnetic

characteristics of lengthwise cable management systems like conduit systems according to EN 61386

series, cable trunking systems and cable ducting systems (CTS/CDS) according to EN 50085 series

and cable tray and cable ladder systems according to EN 61537:
— shielding effectiveness of magnetic field,
— transfer impedance.

This Technical Report also provides guidance on how these characteristics can be declared and may be

used.

Powertrack systems covered by EN 61534 series are not covered by this edition of the Technical Report

and may be considered in a new edition.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

EN 61000-4-5, Electromagnetic Compatibility (EMC) — Part 4-5: Testing and measurement techniques

— Surge immunity test (IEC 61000-4-5)

EN 61000-5-7, Electromagnetic compatibility (EMC) - Part 5-7: Installation and mitigation guidelines -

Degrees of protection by enclosures against electromagnetic disturbances (EM code)

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
shielding effectiveness

ability of a cable management system to attenuate an electromagnetic signal as it enters or exits the

CMS, quantified as the ratio of a signal received (from a transmitter) without the shield, to the signal

received with the shield in place
3.2
magnetic field

constituent of an electromagnetic field which is characterized by the magnetic field strength H together

with the magnetic flux density B

Note 1 to entry: In French, the term “champ magnétique” is also used for the quantity magnetic field strength.

[SOURCE: IEV 121-11-69]
3.3
signal to noise ratio
SNR

ratio in dB between the measured peak current I1,max in the current loop when the current probe is

connected to the current loop and the measured peak current IN,max when the current probe is not

connected to the current loop but in a narrow position of the current loop. Both peak currents measured

at the same excitation current in the excitation winding
1,max
SNR (dB) 20×log
N,max
Note 1 to entry: I1,max and IN,max show their maxima at different time.
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3.4
electromagnetic shielding coding

coding system to indicate the degree of protection provided by a CMS against the passage of

electromagnetic energy
3.5
CMS transfer impedance
CMS

ratio of a voltage drop, between two specified points, caused by a disturbing current flowing through the

cable management system and the disturbing current
This voltage drop is a combination of

— the voltage drop along this cable management system due to the current flowing through this cable

management system and

— the voltage drop along a conductor contained in this cable management system due to the

magnetic field arising from the current flowing through this cable management system.

3.6
virtual CMS transfer impedance
v CMS

CMS transfer impedance defined by the ratio of the maximum asymmetrical mode voltage and the

maximum disturbing current during a time domain pulse
3.7
common mode voltage (or asymmetrical voltage V )

mean of the phasor voltages appearing between each conductor and a specified reference, usually

earth or frame
[SOURCE: IEV 161-04-09, modified]
3.8
shielded enclosure (or screened room)

mesh or sheet metallic housing designed expressly for the purpose of separating electromagnetically

the internal and the external environment
[SOURCE: IEV 161-04-37]
4 Shielding effectiveness of magnetic field
4.1 Introduction

This Technical Report defines the test method for the determination of shielding effectiveness of

magnetic field (SE) for lengthwise cable management systems (CMS).

The efficiency of a shielding is quantified by its shielding effectiveness (SE). The shielding effectiveness

(SE) in this Technical Report is only intended for magnetic fields.
As an activating source a 8/20 µs impulses current shall be used.

The electrical field shielding effectiveness (SE) of metallic cable management systems is not covered by

this Technical Report.

While a screen is a technical provision, the shielding effectiveness shows the performance of this

screen with regard to Electromagnetic Compatibility (EMC) and Electromagnetic Interference (EMI).

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4.2 Declaration
4.2.1 General

The shielding effectiveness of magnetic field shall be declared using the electromagnetic shielding

coding described in 4.2.2 and the additional rules described in 4.2.3.
4.2.2 Electromagnetic shielding coding

The electromagnetic shielding coding consists of “EM” followed by five positions according to Table 1.

Table 1 — Electromagnetic shielding coding

CMS Type EM First position Second position Third position Fourth position Fifth position

Cable tray EM A letter A number being A number being A number being A number being

and cable representing the test result the test result the test result the test result

ladder the frequency for CMS with for CMS without for CMS with for CMS without

systems band as cover running in cover running in cover running in cover running in

shown in a plane parallel a plane parallel a plane a plane
Table 2 to the plane of to the plane of perpendicular to perpendicular to
the excitation the excitation the plane of the the plane of the
winding winding excitation excitation
(Figure 2a) (Figure 2b) winding winding
(Figure 2c) (Figure 2d)
Cable EM A letter A number being NA A number being NA
trunking representing the test result the test result
systems the frequency for CMS with for CMS with
band as cover running in cover running in
shown in a plane parallel a plane
Table 2 to the plane of perpendicular to
the excitation the plane of the
winding excitation
(Figure 2a) winding
(Figure 2c)
Cable EM A letter A number being NA A number being NA
ducting representing the test result the test result
systems the frequency for CMS with for CMS with
band as the larger the larger
shown in dimension dimension
Table 2 running in a running in a
plane parallel to plane
the plane of the perpendicular to
excitation the plane of the
winding excitation
(Figure 2a) winding
(Figure 2c)
Conduit EM A letter A number being NA A number being NA
systems representing the test result the test result
the frequency for CMS running for CMS running
band as in the plane of in the plane of
shown in the excitation the excitation
Table 2 winding winding
(Figure 2a) (Figure 2c)
NOTE “NA” means “not applicable”.
Table 2 — Frequency band code
Frequency band Frequency band code
10 kHz - 100 kHz A
100 kHz - 1 MHz B

The test method currently using 8/20 µs impulses current included in this Technical Report only allows

declaration for frequency band 10 kHz – 100 kHz (Frequency band code A).
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4.2.3 Additional rules

The declared shielding effectiveness shall be the measured shielding effectiveness in dB rounded to the

closest integer, always using two digits.
Examples: 17,49 dB will be 17 and 17,5 dB will be 18. 9,2 dB will be 09.
When shielding effectiveness can be declared, “XX” means not declared.
4.2.4 Example of declaration

Declaring for a cable tray system “EM A-37-20-09-XX” for shielding effectiveness of magnetic field

means, for a frequency band of 10 kHz - 100 kHz,

— a shielding effectiveness of 37 dB for CMS with cover running in a plane parallel to the plane of the

excitation winding

— a shielding effectiveness of 20 dB for CMS without cover running in a plane parallel to the plane of

the excitation winding

— a shielding effectiveness of 9 dB for CMS with cover running in a plane perpendicular to the plane

of the excitation winding

— a shielding effectiveness not declared for CMS without cover running in a plane perpendicular to

the plane of the excitation winding

Declaring for a cable trunking system “EM A-37-NA-09-NA” for shielding effectiveness of magnetic field

means, for a frequency band of 10 kHz - 100 kHz,

— a shielding effectiveness of 37 dB for CMS with cover running in a plane parallel to the plane of the

excitation winding

— a shielding effectiveness of 9 dB for CMS with cover running in a plane perpendicular to the plane

of the excitation winding

Declaring for a conduit system “EM A-70-NA-70-NA” for shielding effectiveness of magnetic field

means, for a frequency band of 10 kHz - 100 kHz,

— a shielding effectiveness of 70 dB for CMS running in the plane of the excitation winding.

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4.3 Test arrangement
4.3.1 General
The test arrangement is shown in Figures 1a to 1c.
Figure 1a — Test arrangement without CMS
Figure 1b — Test arrangement for CMS without cover
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Figure 1c — Test arrangement for CMS with cover
Key
1 table without any conductive part
2 excitation winding
3 plastic fixings
4 samples each (1000 ± 3) mm
5 junction
6 terminating fitting
7 terminating fitting with central opening of up to approximately 50 mm x 50 mm
8 current loop
9 current probe
10 surge current generator
11 oscilloscope
12 current probe excitation winding
13 shielding cabinet
14 cover (500 ± 3) mm
15 cover (1500 ± 3) mm
D1 gap between excitation winding and sample (30 ± 3) mm

D2 gap between current loop and terminating fitting if any or extremity of the sample (150 ± 5) mm on both sides

D3 width of the sample measured in the plane of the excitation winding

Figure 1 — Test arrangement for the measurement of shielding effectiveness of magnetic field

The excitation winding shall be spaced at least 800 mm from any conductive part in any direction except

on the feeding side.
4.3.2 Table

The test arrangement shall be placed on a table made of non conductive material (example: wood). The

table shall be sufficiently stable to carry safely all the components before and while testing. To avoid

measurement errors, the table shall not have any conductive part and its height shall be at least

800 mm.
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4.3.3 Sample

The sample shall consist of two lengths of the cable management system of (1000 ± 3) mm length and

a system component for their junction, if any (coupler). Both ends of the sample shall be closed by a

terminating fitting if it exists in the Cable Management System. In such a terminating fitting, an opening

of up to approximately 50mm x 50mm (diameter 50mm) can be made to insert a current probe and

connect the current probe to the current loop.

The sample shall be installed according to the manufacturer’s instructions, e.g. with the recommended

torques.
4.3.4 Excitation winding

The excitation winding shall consist of a copper tube having a diameter of at least 28 mm and a wall

thickness of at least 1,5 mm together with the relevant fittings or means providing appropriate junction

and connection. All parts of the excitation winding shall be connected in a way providing high

conductivity with means, such as, soldering, screwing, etc. allowing an effective contact on the whole

circumference of the tube. High conductivity shall be checked by measuring the contact resistance, with

a current of at least 10 A, which shall not be higher than 10 mΩ.

NOTE The 1,5 mm minimum thickness of the wall of the copper tube is intended to provide adequate

resistance to bending of the tube during the test.

The excitation winding shall be fixed with non conductive elements to avoid movement during testing.

The width of the excitation winding shall be such that the distance to the CMS is 30 mm ± 3 mm.

4.3.5 Surge current generator

The test shall be carried out with a hybrid surge current generator of 8/20 µs impulses according to

EN 61000-4-5 with 2 Ω output impedance and capable of generating a wave shape with a peak current

above 200 A.

When connected to the excitation winding, the tolerance of the shape of the current shall be:

— peak current Imax: ± 10 %
— wave front duration T1: ± 30 %
— time to half value T2: ± 20 %
— minimum peak current 200 A

NOTE The inductance of a 60 cm wide CMS and a 2 m long excitation winding can reach a value of around

8 µH.
4.3.6 Current loop

The current loop shall consist of a flexible copper conductor with a cross section of 2,5mm , fixed by a

non-metallic support preferably made of plastic or wood (see Figure 3 for an example). The centre

distance d (see Figure 3) of the copper conductors shall be 30 mm ± 1mm or 10 mm ± 1mm for smaller

CMS.

Compliance with this distance can be checked by measuring the spacing between the grooves

accommodating the copper conductor in the insulated holder.

NOTE For cable management systems that cannot be opened (e.g. CDS and conduits) having an internal

diameter less than 30 mm the distance d of the copper conductors may be reduced to 10 mm.

The current loop shall be fixed in the plane of the excitation winding, in the centre of the excitation

winding (±1 mm) (see Figure 2). The distance between the current loop and the terminating fitting, if

any, or extremity of the sample shall be (150 ± 5) mm (See D2 in Figure 1).
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Figure 2a — For CMS with cover running in a plane parallel to the plane of the excitation winding

Figure 2b — For CMS without cover running in a plane parallel to the plane of the excitation

winding

Figure 2c — For CMS with cover running in a plane perpendicular to the plane of the excitation

winding
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Figure 2d — For CMS without cover running in a plane perpendicular to the plane of the

excitation winding
Key
1 current loop
2 excitation winding
3 cable tray/ladder or base of trunking
4 cover
D1 gap between excitation winding and sample (30 ± 3) mm
D3 width of the sample measured in the plane of the excitation winding
Figure 2 — Position of the current loop within the sample
Key
1 insulated holder
2 plastic screw
3 flexible copper conductor 2,5 mm
d distance 30 mm ± 1 mm or for small CMS 10 mm ± 1 mm
Figure 3 — Examples for arrangements of the current loop
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4.3.7 Current probe
The current in the current loop shall be measured with a probe.

The bandwidth of the probe shall be at least 50 MHz. The uncertainty in measurement of the scaling

factor shall be less than 3 %.

When using Hall effect probe, it is necessary to degauss the current probe at each measurement to

avoid any unwanted offset.

The lower cut off frequency shall be lower than 1 kHz and the upper cut off frequency shall be greater

than 50 MHz in order to measure the current correctly and within 3 % accuracy. This requirement

originates from the spectra of an 8/20 µs impulses current as shown in Figure 4.
Figure 4 — Spectra of a 8/20 µs impulses current

The current probe for the measurement of the loop current shall be capable of measuring small currents

of some 10 mA in the environment of the magnetic field of the excitation winding which is feed by some

100 A. Therefore, a good shielding of the current probe is recommended.
4.3.8 Shielding cabinet for the measuring equipment

It is recommended to use a steel cabinet with connected mains filter to achieve the required signal to

noise ratio SNR of at least 26 dB. It is recommended to arrange the oscilloscope and, if applicable, the

receiver of the current probe inside the shielding cabinet.
4.3.9 Oscilloscope

The bandwidth of the oscilloscope shall be at least 50 MHz. The uncertainty in measurement shall be

less than 3 %.
4.4 Test method
4.4.1 Climatic conditions

The climatic conditions in the laboratory shall be within any limits specified for the operation of the test

equipment by their respective manufacturers.
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4.4.2 Conditioning/Ageing
The sample shall be aged as follows:

The necessity to carry out conditioning or ageing before the shielding effectiveness test is under

consideration.
4.4.3 Principle

Relative measurements are used for the determination of the shielding effectiveness (SE) of c

...

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