Bsi bs en 50086 2 4 1994 (1999)

BS EN
50086-2-4:1994

Specification for

Conduit systems for
electrical
installations
Part 2: Particular requirements

-

Section 2.4: Conduit systems buried
underground

The European Standard EN 50086-24: 1994 has the status of a
British Standard
This British Standard should be read in conjunction with
BS EN 50086-111994

UDC 621.315.2:696.6

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BS EN 50086-2-4:1994

Cooper at ing organization s
The European Committee for Electrotechnical Standardization (CENELEC),
under whose supervision this European Standard was prepared, comprises the
national committees of the following countries:
Austria
Belgium
Denmark
Finland
France
Germany
Greece
Iceland
Ireland

Amd.No.

Italy
Luxembourg
Netherlands
Norway
Portugal
Spain
Sweden
Switzerland
United Kingdom

Date

Comments

O BSI 06-1999

The following BSI references
relate to the work on this
standard:
Committee reference PEL/80
Draft for comment 92/32675 DC

ISBN O 580 23412 6
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BS EN 50086-2-4:1994

Contents
Cooperating organizations
National foreword
Foreword
Text of EN 50086-2-4
National annex NA (informative) Committees responsible

Page
Inside front cover
..
11

2
3
9

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BS EN 50086-2-4:1994

National foreword
This British Standard has been prepared under the direction ofthe Power
Electrical Engineering Standards Policy Committee and is the English language
version of EN 50086-2-4:1994 Cmduit systemsfor electrical installations Part 2-4: Particular requirementsfor conduit systems buried underground,
published by the European Committee for Electrotechnical Standardization
(CENELEC).
The foreword ofEN 50086-24 makes reference to the ?date ofwithdrawal?(dow)
of the relevant national standard. In this case the relevant national standard

is DD 200: 1991 which will be withdrawn on 1 October 1994. Certificates and
Marks will not be awarded after this date with respect to the withdrawn British
Standard. However, such Certificates and Marks, already awarded may continue
to apply to production until 1 October 1999.
This British Standard is to be read in conjunction with BS EN 50086-1:1994
Specijicationfor conduit systemsfor electrical installations -Part I : General
requirements. The references to Part 1 should be read as references to
BS EN 50086-1:1994which is the English language version ofEN 50086-1:1993.
A British Standard does not purport to include all the necessary provisions of a
contract. Users of British Standards are responsible for their correct application.

Compliance with a British S t a n d a r d does n o t of itself confer immunity
from legal obligations.

Summary of pages
This document comprises a front cover, an inside front cover, pages i and ii,
the EN title page, pages 2 to 9 and a back cover.
The BSI copyright notice displayed in this document indicates when the
document was last issued.

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EUROPEAN STANDARD

EN 50086-2-4

NORME EUROPÉENNE

March 1994

EUROPÄISCHE NORM

UDC 621.315.2:696.6
Descriptors: Electric wiring system, conduit buried underground, mechanical characteristics, electrical characteristics, test

English version

Conduit systems for electrical installations Part 2-4: Particular requirements for conduit
systems buried underground

Systèmes de conduits pour installations
électriques Partie 2-4: Règles particulières pour les systèmes de
conduits enterrés dans le sol

Elekt r oinst allati on sr Ohr sys teme für elektrische
installationen Teil 2 4 : Besondere Anforderungen für erdverlegte
Elektroinstallations-rohrsysteme

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This European Standard was approved by CENELEC on 1993-09-22. CENELEC
members are bound to comply with the CENKENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status o f a
national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any
CENELEC member.
This European Standard exists in three official versions (English, French,
German). A version in any other language made by translation under the
responsibility of a CENELEC member into its own language and notified to the
Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria,
Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and
United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
C e n t r a l Secretariat: r u e de Stassart 35, B-1050 Brussels
O 1994 Copyright reserved to CENELEC members
Ref No. EN 50086-2-4: 1994 E
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EN 50086-2-4:1994
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Foreword

Contents

This European Standard has been prepared by
CENELEC Technical Committee TC 113, Cable
Management Systems.
This Part 2 4 specifies particular requirements for
conduit systems buried underground.
A conduit system which conforms to this standard,
is deemed safe for use.

The text of this standard was submitted to the
formal vote and was approved by CENELEC as
EN 50086-24 on 1993-09-22.
The following dates were fixed.
latest date ofpublication
of an identical national
st an dard
- latest date ofwithdrawal
of conflicting national
st an dards
-

(dûp) 1994-10-01

(dûw) 1994-10-01

For products which have complied with the relevant
national standard before 1994-10-01, as shown by
the manufacturer or by a certification body, this
previous standard may continue to apply for
production until 1999-10-01.
This Part 2 4 supplements or modifies the
corresponding clauses ofEN 50086-1: 1993, Conduit
systemsf i electrical installations-Part I : General
requirements.

Foreword
1
Scope
2
Normative references
Definitions
3
4
General requirements
General conditions for test
5
Classification
6
Marking and documentation
7
Dimensions
8
Construction

9
10 Mechanical properties
11 Electrical properties
12 Thermal properties
13 Fire effects
14 External influences
15 Electromagnetic compatibility
Figure 101 -Impact test apparatus
Figure 102 -Bending test apparatus
Table 101-Outside diameters Preferred values
Table 102 -Impact test energy values

Page
2
3
3
3
3
3
3
4
4
4
4
5
5
5
6
6
7

8
6
6

Where a particular clause or subclause of Part 1 is
not mentioned in this Part 2-4, that clause or
subclause applies as far as is reasonable. Where this
Part 2 4 states “addition”, “modification” or
“replacement”, the relevant text of Part 1 is to be
adapted accordingly.
Subclauses and figures which are in addition to
those in Part 1 are numbered starting with 101.

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EN 50086-2411994

1 Scope
Replacement:
This standard specifies requirements and tests for conduit systems buried underground including conduits
and conduit fittings for the protection and management of insulated conductors andor cables in electrical
installations or in commuiiication systems. This standard applies to metallic, non-metallic and composite

systems including threaded and non-threaded entries which terminate the system.
Conduit systems which are used as an integral part ofother equipment shall also be tested according to the
relevant specification for that equipment.

2 Normative references
This clause of part 1 is applicable except as follows:
EN 60423 (in process), Not applicable.
IEC 670,
Not applicable.
Addition:
I S 0 161- 1:1978,

7hermoplasticpipesfor the transport of’uids
nominal pressures -Part I : Metric series

Nominal outside diameters and

-

3 Definitions
This clause of part 1 is applicable except as follows:
Addition:
3.101
multiwall conduit
a conduit consisting of several walls which may be a combination of plain andor corrugated walls

4 General requirements
This clause of part 1 is applicable.

5 General conditions for tests

This clause of part 1 is applicable.

6 Classification
This clause of part 1 is applicable except as follows:
6.1 According to mechanicalproperties
Replacement:
6.1.1 Resistance to impact:
1
2

Normal duty
Light duty

6.1.2 Resistance to bending:
1
2
6.2, 6.3

Rigid
Pliable
are not applicable.

Addition:
6.4.1O 1 Resistance against chemical attack:
1
2

Without protection.
With protection.

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EN 50086-2-4:1994

6.5.3 is not applicable

7 Marking and documentation
This clause of part 1 is applicable except as follows:
7.1 Addition:
c) the type of conduit N mormal duty) or L (Light duty).
Addition:
7.1.101 Conduits shall be marked in accordance with 7.1 at regular intervals along their length of
preferably 1 m but not longer than 3 m.
7.1.102 The manufacturer shall provide in his literature all information necessary for the proper and safe
installation and use.
7.2 Replacement:
Conduit fittings shall be marked in accordance with 7.1 on the product.
7.3, 7.4 are not applicable.
7.5 Addition:
An alternative test is under consideration.

8 Dimensions
Replace the text of this clause by:
Conduits should be preferably according to Table 101.
Compliance of the minimum inside diameter shall be checked by measurement according to two
pevendicular diameters on the same section and calculating the average value.
Compliance of the outside diameter shall be checked using a ring gauge or any suitable method.

9 Construction
This clause of part 1 is applicable except as follows:
9.3 and 9.4 are not applicable.

10 Mechanical properties
This clause of part 1 is applicable except as follows:
10.1.4 Replacement:
Compliance is checked by the tests of 10.2, 10.3 and 10.4
10.2 Compression t e s t
Replacement:
10.2.1 Conduits and bends are subjected to a compression test.
The test for conduits and bends containing non-metallic materials shall not be started until 10 days after
manufacture.
10.2.2 Samples shall be (200 f 5) mm long.

10.2.4 The samples shall be compressed between two flat steel plates having minimum dimensions
(100 X 200 X 15) mm, the length 200 mm being along the length of the sample. The samples shall be
compressed at a rate of(15 f 0,5) mm/min and the load recorded at the vertical deflection equivalent to 5 YO
of the average value of the original inside diameter of the sample.

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10.2.3 Before the test, the outside and inside diameters of the samples shall be measured as described in
clause 8.


EN 50086-2411994

10.2.5 When reaching the deflection Of 5 "/o, the applied force shall be at least 450 N.
NOTE The deflection is calculated with the inner diameter but the measurement of the outside diameter may be sufficient. In case
ofdoubt, it will be necessary to measure the inner diameter.

10.2.6 After the test, there shall be no crack allowing the ingress of light or water between the inside and
the outside.
10.3 Impact test
Replacement:
10.3.1 Twelve samples ofconduits each (200 f 5 ) mm in length or conduit fittings are subjected to an
impact test by means ofthe apparatus shown in Figure 101.
Conduits are tested alone.
Fittings are tested when assembled with conduits by using a suitably shaped 120"vee-block.
10.3.2 The test apparatus shall be placed on a firm flat surface.
The samples shall be conditioned in a cold chamber at the temperature of (- 5

* 1) OC for 2 h.

The samples shall be removed from the cold chamber and placed on the vee-block holder as shown in
Figure 101.
The striker shall fall once on each sample. The time between removal ofthe sample from the cold chamber
and completion of impact shall not exceed 10 s. The energy values are specified in Table 102.
The test shall be made on the weakest part of the conduit fitting except that it shall not be applied
within 5 mm of any sample entry. Samples of conduit are tested on the centre of their length.
10.3.3 After the test, at least in nine ofthe samples, there shall be no crack allowing the ingress oflight or
water between the inside and the outside.
10.4 Bending test
Replacement:
10.4.1 This test shall be carried out on pliable conduits.
10.4.2 The test is made on six samples having an appropriate length. Three samples are tested at room
temperature, the other three are tested at (-5 f 1) OC.
For the test at -5 OC, the samples shall be conditioned in a cold chamber for 2 hours.
The test apparatus consists of a device as shown in Figure 102 allowing to bend the conduit with a bending
radius equal to the minimum bending radius specified by the manufacturer.
One of the ends of the samples shall be fixed on the test apparatus by means of an appropriate device. The
sample is then bent to approximately 90" and hold.
10.4.3 During the test, the samples shall not flatten.
Compliance shall be checked bypassing a ball having a diameter equal to (95 +I / 4 ) %ofthe minimum
inner diameter of the sample declared by the manufacturer, through the sample whilst it is bent around the
tmt apparatus.
10.5, 10.6, 10.7 and 10.8 are not applicable.

11 Electrical properties
This clause of part 1 is not applicable.

12 Thermal properties
This clause of part 1 is applicable except as follows.

12.2 is not applicable.

13 Fire effects
This clause of part 1 is not applicable.

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EN 50086-2-4:1994

14 External influences
This clause of part 1 is applicable except as follows:
Addition:
14.1O 1 Resistance to chemical attack
Under consideration.

15 Electromagnetic compatibility
This clause of part 1 is applicable.
Table 101 - Outside diameters - Preferred values
Outside diameter

Nominal size

mm

mm

25
32
40
50
63
75
90
110
125
140
160
180
lo0
125
150
VOTE

Toler ance

Mïn. inside diameter

mm

25
32

40
50
63
75
90
110
125
140
160
180
200
225
250

+0,5
+0,6
+0,8
+1,0
+1,2
+1,4
+1,7
+2,0
+2,3
+2,6
+2,9
+3,3
+3,6
+4,1
+4,5

mm

18
24
30
37
47
56
67
82
94
06
20
35
50
70
88

The nominal outsic diameters are taken from IS0 161-

-Tolerances on Outside Diameters are given as follows:
OD min is nominal outside diameter,
OD max is nominal outside diameter +(0,018 X nominal outside diameter values) rounded off
to+0,1 mm.
-Minimum inside diameter is nominal outside diameter divided by 1,33.
Table 102-Impact
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I

Light d u t y

Nominal size of Mass of striker
conduit
kg
(+l/O) %

Fall height
mm
(+i/-O) %

L60
61 to90
91 to 140
>140

3
3
3
3

1O0
200
400
500

test energy values

I
Energy

J

3
6
12
15

Normal duty
Mass of striker
kg
(+1/0) %

5
5
5
5

6

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Fall height
mm
(+&O) %

300
400
570

800

Energy
J

15
20
28
40

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EN 50086-2411994

'.O-

.S.B

.7
.6

.5
.4

Graduuted scale, vertically adjustable
for different sizes of conduit

Frame

Striker guidance/
weight carriage

Striker

\
-

Striker

1
El-

0

r

20

m

*TOTE This drawing is not intended to govern design except as regards the dimensions shown.

Figure 101-Impact

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test a p p a r a t u s

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Rigid base _f___.

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EN 50086-2-4:1994

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suppon

\Guide for conduit
.JOTE

This drawing is not intended to govern design except as regards the dimensions shown

Figure 102 -Bending

test a p p a r a t u s

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BS EN 50086-2-4:1994

National annex NA (informative)
Committees responsible
The United Kingdom participation in the preparation of this European Standard was entrusted by the
Power Electrical Engineering Standards Policy Committee (PEL/-) to Technical Committee PEL/80 upon
which the following bodies were represented:
ASTA Certification Services
British Electrical Systems Association (BEAIMA Ltd.)
British Telecommunications plc
Electrical Installation Equipment Manufacturers’ Association
Institution of Electrical Engineers
Institution of Incorporated Executive Engineers

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BS EN
50086-2-4: 1994
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British Standards. It presents the UK view on standards in Europe and at the
international level. It is incorporated by Royal Charter.
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