EN 50174-2:2009/A1:2011

SLOVENSKI STANDARD
01-maj-2011
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Information technology - Cabling installation - Part 2: Installation planning and practices
inside buildings
Informationstechnik - Installation von Kommunikationsverkabelung - Teil 2:
Installationsplanung und Installationspraktiken in Gebäuden
Technologies de l'information - Installation de câblages - Partie 2: Planification et
pratiques d'installation à l'intérieur des bâtiments
Ta slovenski standard je istoveten z: EN 50174-2:2009/A1:2011
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
35.110 Omreževanje Networking
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50174-2/A1
NORME EUROPÉENNE
February 2011
EUROPÄISCHE NORM
ICS 35.110; 91.140.50
English version
Information technology -
Cabling installation -
Part 2: Installation planning and practices inside buildings

Technologies de l'information -  Informationstechnik -
Installation de câblages - Installation von
Partie 2: Planification et pratiques Kommunikationsverkabelung -
d'installation à l'intérieur des bâtiments Teil 2: Installationsplanung und
Installationspraktiken in Gebäuden

This amendment A1 modifies the European Standard EN 50174-2:2009; it was approved by CENELEC on
2011-01-03. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of 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 amendment 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, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50174-2:2009/A1:2011 E

Foreword
This amendment to the European Standard EN 50174-2:2009 was prepared by the Technical Committee
CENELEC TC 215, Electrotechnical aspects of telecommunication equipment.
The text of the draft was submitted to the formal vote and was approved by CENELEC as amendment A1 to
EN 50174-2:2009 on 2011-01-03.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights.
The following dates were fixed:
– latest date by which the amendment has to be implemented

at national level by publication of an identical

national standard or by endorsement
(dop) 2012-01-03
– latest date by which the national standards conflicting

with the amendment have to be withdrawn
(dow) 2014-01-03
This amendment introduces:
– a new Clause 10 with specific requirements for installation of cabling in homes;
– a new Clause 11 with specific requirements for installation of cabling in data centres;
– detailed requirements and recommendations for installation of cabling in office (including commercial)
(see Clause 8) premises and in industrial premises (see Clause 9);
– some technical and editorial modifications to the other clauses.

– 3 – EN 50174-2:2009/A1:2011
Text of A1 to EN 50174-2:2009
Introduction
Replace Table 1 with:
Table 1 – Contextual relationship between EN 50174 series and other standards
relevant for information technology cabling systems
Building design phase Generic cabling Specification phase Installation phase Operation phase
design phase
EN 50310 EN 50173 series EN 50174-1 EN 50174-1
except
EN 50173-4
6. Bonding networks 4: Structure 4: Requirements for 4: Requirements for
specifying installations specifying installations
5: Channel performance
of information of information
technology cabling technology cabling
7: Cable requirements
5: Requirements for
8: Connecting hardware
installers of information
requirements
technology cabling
9: Requirements for
cords and jumpers
A: Link performance
limits
Planning phase
and
EN 50173-4 EN 50174-2 EN 50174-2
4 and 5: Structure 4: Requirements for 5: Requirements for the
planning installations of installation of
6: Channel performance
information technology information technology
cabling cabling
8: Cable requirements
6: Segregation of 6: Segregation of
9: Connecting hardware
metallic information metallic information
requirements
technology cabling and technology cabling and
10: Requirements for
power supply cabling power supply cabling
cords and jumpers
7: Electricity distribution 8: Office (commercial)
A: Link performance systems and lightning premises
limits protection
9: Industrial premises
10: Homes
11: Data centres
and and
EN 50174-3 EN 50174-3
and and
(for equipotential (for equipotential
bonding) bonding)
EN 50310 EN 50310
and
EN 50346
4: General requirements
5: Test parameters for
balanced cabling
6: Test parameters for
optical fibre cabling
1.1 Scope
Replace “mains power” with “power supply” in bullet 2 (English version only).
th
Replace 5 paragraph with:
This standard is applicable to certain hazardous environments. It does not exclude additional requirements
which are applicable in particular circumstances, defined by e.g. electricity supply and electrified railways.
1.2 Conformance
Replace bullet g) with:
g) local regulations, including safety, that are more stringent than the requirements listed in a) to f) shall be
met.
2 Normative references
Add the following references:
EN 50090-9-1:2004, Home and Building Electronic Systems (HBES) – Part 9-1: Installation requirements –
Generic cabling for HBES Class 1 Twisted Pair
EN 50491 series, General requirements for Home and Building Electronic Systems (HBES) and Building
Automation and Control Systems (BACS)
1)
EN 50491-6-1 , Home and Building Electronic Systems (HBES) and Building Automation and Control
Systems (BACS) - Part 6-1: Installation requirements
EN 60670 series, Boxes and enclosures for electrical accessories for household and similar fixed electrical
installations
Delete reference to IEC 61784-4.
3 Terms, definitions and abbreviations
3.1 Terms and definitions
Replace in existing 3.1.11 and 3.1.15 “mains power” with “power supply” (English version only).
Insert the following definitions and renumber existing definitions accordingly:
3.1.2
co-hosting data centre
data centre in which multiple customers are provided with access to network(s), servers and storage
equipment on which they operate their own services/applications
NOTE Both the information technology equipment and the support infrastructure of the building are provided as a service by the data
centre operator.
3.1.3
co-location data centre
———————
1)
In preparation.
– 5 – EN 50174-2:2009/A1:2011
data centre in which multiple customers locate their own network(s), servers and storage equipment
NOTE The support infrastructure of the building (such as power distribution and environmental control) is provided as a service by
the data centre operator.
3.1.5
data centre
building or space, whose primary function is to accommodate equipment that processes, delivers and/or
stores information
NOTE A data centre can consist of multiple spaces with specific functions to support the primary function.
3.1.8
enterprise data centre
data centre that is operated by an enterprise which has the sole purpose of the delivery and management of
services to its employees and customers
3.1.9
entrance room
space within, or at the boundary of, a building housing the demarcation point where facilities owned by
external service providers interface with the premises cabling
NOTE For generic cabling in accordance with EN 50173-5, the demarcation point is the external network interface (ENI) and the data
centre cabling at that point is the network access cabling.
3.1.10
equipment connection space
space within a home that corresponds to the installation space IS6 of EN 50491-6-1 and that may house the
outlets (TO, BO, MATO, CO) of EN 50173-4 together with attached equipment
3.1.14
home entrance
space at the boundary of a home that may house the interface(s) between the home networks and external
networks provided to the home and that demarcate the administration and maintenance of the two networks
3.1.16
junction box
space within a home that corresponds to the installation space IS5 of EN 50491-6-1 and housing a closure,
typically in accordance with the EN 60670 series, designed to allow cables to be routed between pathway
systems
3.1.17
local distribution space
space within a home that corresponds to the installation space IS5 of EN 50491-6-1 and that may house the
area connection point (ACP) of EN 50173-4
3.1.20
multi-tenant premises
premises containing multiple homes that have each their own home entrance space but share building
entrance facilities (BEF) and associated distribution spaces
3.1.21
network operator data centre
data centre that has the primary purpose of the delivery and management of broadband services to the
operators’ customers
3.1.24
primary distribution space
space within a home that corresponds to the installation space IS4 of EN 50491-6-1 and that may house the
home distributor (secondary home distributor) of EN 50173-4 and associated equipment

3.1.28
semi-detached house
residence of a single family within a building containing two single-family houses where access to external
service provision is shared
3.1.29
single-family house
residence of a single family within which access to the home entrance space is limited to dweller of the
house
3.2 Abbreviations
Insert the following additional abbreviations:
CPL Central Patching Location
HBES Home and Building Electronic System
HE Home Entrance
SHD Secondary Home Distributor
UPS Uninterruptible Power Supply
ZPL Zone Patching Location
4 Requirements for planning installations of information technology cabling
4.1.2 Mains power cabling
Replace title with:
4.1.2 Power supply cabling
4.1.7 Closures
Replace “mains power” with “power supply” (6 places).
4.1.8.2 External cables containing flammable materials
Replace subclause with:
Information technology cables that do not comply with the minimum recommended performance
requirements of EN 60332-1-2 shall either be:
a) terminated inside the building, within 2 m (unless an alternative distance if specified by local regulations)
of the point of internal penetration of the external fire barrier (e.g. floor/ceiling/wall);
or
b) any length exceeding 2 m (unless an alternative distance if specified by local regulations) is installed
within trunking or conduit that is considered as a fire barrier in accordance with local fire regulations.
NOTE This also applies where the cable has to pass through a space between two external fire barriers within a building.
4.1.9 Termination points
Replace “mains power” with “power supply” in two places.

– 7 – EN 50174-2:2009/A1:2011
4.3.1 Cable segregation
nd
Replace “mains power” with “power supply” in 2 paragraph.
4.4 Pathway systems
Insert new heading:
4.4.1 Requirements
st
Amend 1 paragraph to read:
Pathways, entry points to the pathways and the pathway systems selected shall ensure cables are able to be
installed and, where appropriate, fixed in accordance with the applicable minimum bend radius (during
installation, during operation – static and during operation – dynamic). This may be achieved by the use of
pre-fabricated curved corners, drop-outs, radius limiters or other means. Where multiple cable types are
involved, the largest minimum bend radius shall apply.
Insert new subclause
4.4.2 Recommendations
During initial planning, the initial quantity of cables should not use more than 40 % of the usable cross-
sectional area within the chosen pathway system subject to the following definition for useable cross-
sectional area:
a) for uncovered pathway systems and cable management systems (e.g. tray or basket), cables are not
installed above the sidewalls (note electromagnetic screening performance of the selected cable
management system may require modified criteria - see Clause 6);
b) bends in the pathway systems may restrict the useable cross-sectional area dependent upon the
specified bend radii of the cable to be installed;
c) for non-enclosed pathway systems to which cables are to be attached or supported by (e.g. messenger/
catenary wires or designated routes) the cross-sectional area shall be considered to be the minimum
available area surrounding the pathway system.
4.5.1 Requirements
Delete text from “Non-metallic cable management systems.” to “ • optical fibre cabling” and from “The
th th th
planning (selection and location) …” to “… installed above the sidewalls” (i.e. 7 ,8 and 10 paragraphs).
4.5.2 Recommendations
Insert the following text at the end of existing text:
Non-metallic cable management systems are neutral products from the electromagnetic point of view. They
do not provide electromagnetic screening to the contained cabling, but they do not perturb the cabling by
transferring induced currents or leakage currents. Non-metallic cable management systems should be used
where electromagnetic screening is not required by the cables to be installed within them.
Insert new subclause as follows:

4.8 Spaces
Requirements and recommendations for the spaces in different types of premises are found in Clauses 8, 9,
10 and 11.
5 Requirements for the installation of information technology cabling
5.1.1.1 Mains power cabling
Replace title with:
5.1.1.1 Power supply cabling
5.1.3 Closures
Replace “mains power” with “power supply” in three places.
5.1.4 Cables
nd
Replace 2 paragraph with:
Information technology cables that do not comply with the minimum recommended performance
requirements of EN 60332-1-2 shall be installed according to the instructions of the planner (see 4.1.8.2).
5.3.2 Pathways
Replace last two paragraphs with:
Where it is necessary to remove ceiling tiles, floor covers or trunking covers, only the minimum number shall
be removed and these shall be replaced on completion of works.
Fire barriers and gas seals shall be opened only when necessary and resealed on completion of works.
5.3.3.1.1 Requirements
st
Insert new 1 paragraph as follows:
Any structures, fixtures and fittings used to support the telecommunications cabling within the pathways shall
be installed in accordance with instructions provided by the manufacturer(s) and/or supplier(s) of the fixtures
and fittings.
th
Delete existing 4 paragraph.
5.3.3.2 Electrically conductive cable management systems
Correct reference to “7.1.3.3” to read “7.1.3.4”.
5.3.3.3.1 Requirements
Replace bullet c) as follows:
c) Figure 4 shows cable management systems crossing a wall at which a fire barrier is to be re-instated
following cable installation. Unless specifically allowed by local regulations, the fire-stop materials or fire-
stopping techniques, the cable management system shall be interrupted and the two metallic sections
shall be bonded. The bonds shall have performance in accordance with EN 50310;

– 9 – EN 50174-2:2009/A1:2011
5.3.3.3.2 Recommendations
st
In the 1 paragraph correct reference to “4.4.2” to read “4.5.2”.
5.3.5.1 General
rd
In 3 paragraph replace “mains power” with “power supply”.
5.3.5.3.1 Requirements
th
Insert new 6 paragraph:
The re-instatement of the fire rating of fire barriers in accordance with local regulations shall be implemented
using the specified fire-stop materials and/or fire-stopping techniques.
5.3.5.4 Requirements for closures
rd
Insert new 3 paragraph:
The bend radii of telecommunications cables and telecommunications cable elements within closures shall
be in accordance with the instructions provided by the telecommunications cable manufacturer and/or
supplier.
5.3.6.3 Screened cabling
Replace the first four lines with the following (list a) to g) unchanged):
The cable screen shall totally surround the cable along its entire length (a screening contact applied only
through the drain wire has little effect at high frequencies).
Cable screens shall be terminated at each termination point to maintain the intended performance of the
cable screen termination of connecting hardware. Where instructions for termination of a specific cable are
not available from the manufacturer/supplier of the connecting hardware:
5.6 Testing
Replace existing text as follows:
If required by the quality plan, final cabling inspection and tests shall be undertaken as soon as practicable
following marking, labelling and fitting of all components associated with the telecommunications cabling into
their final locations.
5.7 Contractual acceptance
Replace existing text as follows:
If required within the installation specification, acceptance procedures shall be undertaken as soon as
practicable following marking, labelling and fitting of all components associated with the telecommunications
cabling into their final locations.
Insert new subclause as follows:

5.8 Operation
5.8.1 Requirements
Provided that there is no risk of damage to cables or the pathway system additional cables may be installed
within pathway systems according to the following rules:
a) using all the useable cross-sectional area (see 4.4.2) within:
1) uncovered pathway systems and cable management systems;
2) pathway systems and cable management systems from which covers are removed before
installation of cables;
3) non-enclosed pathway systems and cable management systems;
b) using up to 40 % of the useable cross-sectional area (see 4.4.2) within conduit (unless the conduit
contains empty sub-conduits).
5.8.2 Recommendations
No additional recommendations.
6 Segregation of metallic information technology cabling and mains power cabling
Replace title with:
6 Segregation of metallic information technology cabling and power supply cabling
6.1 General
nd
paragraph, bullet b) and in Note 2.
Delete “mains” in 2
Delete NOTE 1 and renumber NOTE 2.
Replace “any” in bullet c) with “one or more”.
6.2.1 General segregation requirements
Replace “mains power” with “power supply” in 15 places (including figures) throughout the subclause.
th
Replace 4 paragraph with:
Where the cabling to be installed is in accordance with, and is intended to support the applications of Class
D or above listed in the EN 50173 series the separation requirements for classification “b” in Table 4
represent the minimum requirements of this standard. Reduced separations based upon the other
classifications of Table 4 may restrict the type and use of cables installed in the pathways and cable
management systems selected.
– 11 – EN 50174-2:2009/A1:2011
Replace Table 4 with:
Table 4 – Minimum separation S
Containment applied to information technology
or power supply cabling
Segregation Separation without Open metallic Perforated metallic Solid metallic
a b, c d
classification electromagnetic containment containment containment
barrier
(from Table 3)
d 10 mm 8 mm 5 mm 0 mm
c 50 mm 38 mm 25 mm 0 mm
b 100 mm 75 mm 50 mm 0 mm
a
300 mm 225 mm 150 mm 0 mm
a
Screening performance (0 MHz to 100 MHz) equivalent to welded mesh steel basket of mesh size 50 mm × 100 mm (excluding
ladders). This screening performance is also achieved with steel tray (trunking without cover) of less than 1,0 mm wall thickness
and/or more than 20 % equally distributed perforated area.
b
Screening performance (0 MHz to 100 MHz) equivalent to steel tray (trunking without cover) of at least 1,0 mm wall thickness and
no more than 20 % equally distributed perforated area. This screening performance is also achieved with screened power cables
that do not meet the performance defined in footnote d.
c
The upper surface of installed cables shall be at least 10 mm below the top of the barrier.
d
Screening performance (0 MHz to 100 MHz) equivalent to a steel conduit of 1,5 mm wall thickness. Separation specified is in
addition to that provided by any divider/barrier.

th
Replace 12 paragraph, starting with “Cables for different purposes….” with:
From an EMI perspective, this standard considers circuits to be within the following groups:
– Group 1: Power supply: e.g. AC and/or DC, high di/dt power circuits, speed drives, power converters,
etc, which may disturb signals within Groups 2, 3 and 4;
– Group 2: Auxiliary: e.g. relay contactor, actuator, command and control, which may disturb signals within
Groups 3 and 4;
– Group 3: Information technology, which may disturb signals within Group 4;
– Group 4: Sensitive circuits: e.g. analog signalling, low level sensors.
Cables of different groups shall not be in the same bundle (see Figure 8, where power supply and
information technology segregation meets the requirement of this clause).
6.2.2 Conditional relaxation of requirement
st
In 1 paragraph replace “mains power” with “power supply”.
In bullet b) replace “power conductors” with “power supply conductors”.
7 Electricity distribution systems and lightning protection
Insert new 7.1.2 and renumber existing subclauses.

7.1.2 Availability of supply
Where operational procedures, including those designated by national or local regulations or in accordance
with manufacturers’ instructions, require actions that could interrupt supply then either appropriate facilities
shall be provided, or the actions scheduled, to avoid unplanned disruption to the information technology
equipment.
Examples of such procedures include the testing of residual current devices and the replacement of surge
protection devices on power supply cabling.
8 Office (commercial) premises
8.3 Requirements for planning installations of information technology cabling
Replace text with:
8.3.1 Safety
No additional requirements.
8.3.2 Documentation
No additional requirements.
8.3.3 Pathways
8.3.3.1 External service provision
8.3.3.1.1 Requirements
A risk assessment shall be undertaken to determine the need for:
a) multiple service providers;
b) multiple service provider premises (i.e. operator sites or central offices);
c) diverse pathways from each of the service provider premises;
d) multiple BEFs;
e) multiple entrance rooms.
8.3.3.1.2 General recommendations
Where external service provision from multiple service provider premises is required, it should be ensured
that the pathways to the premises are diversely routed in order to remove any single point-of-failure.
Multiple entrance pathways should be used between the boundary of the premises and the entrance room(s)
in order to remove any single point-of-failure. These pathways may include customer-owned maintenance
holes where the pathway systems owned by the access provider do not terminate at the boundary of the
premises.
A minimum of two entrance pathways should be provided both of which should be:
a) located underground (aerial entrance pathways are not recommended because of their vulnerability due
to physical exposure);
b) physically separated between the boundary of the premises and the point of entry into the building by at
least 20 m to minimise the risk of a single incident causing damage to both entrance pathways.
The entrance pathways should also have adequate capacity to handle growth and additional service
providers.
Each external service provider should enter the premises via at least two pathways. Pathways should be
considered between entrance rooms.

– 13 – EN 50174-2:2009/A1:2011
8.3.3.2 Office pathways
8.3.3.2.1 Requirements
The design of pathways shall be co-ordinated with architects and other responsible engineers.
8.3.3.2.2 General recommendations
Consideration should be given to providing protection against failure in one or more parts of the cabling
infrastructure by implementing:
a) multiple areas of distribution with appropriate fire compartmentation with areas served by different
power supply distribution units, and be served by different environmental control equipment;
b) multiple pathways between each area of distribution ensuring that maximum channel lengths are not
exceeded.
The location of aisles separating rows of cabinets, frames or racks should be co-ordinated with lighting and
fire protection plans:
c) lighting should be placed above aisles and not above cabinets, frames, racks and overhead pathways;
d) pathways should not be located where they interfere with proper operation of fire suppression systems
such as water distribution from sprinkler heads.
Pathways should not block airflow to or from environmental control equipment.
Pathways should not restrict access to other building infrastructures that require periodic maintenance e.g.
valves, electrical receptacles and smoke detectors. Under-floor pathways should not be located above such
equipment unless there is an accessible row of tiles adjacent to these pathways.
8.3.3.2.3 Additional recommendations for generic cabling
Consideration should be given to providing protection against failure in one or more parts of the cabling
infrastructure by implementing:
a) multiple CDs in the campus;
b) multiple BDs in each building;
c) multiple FDs on each floor;
d) multiple pathways between CDs;
e) multiple pathways between BDs;
f) multiple pathways between FDs on each floor;
g) multiple pathways between each CD and BDs and each BD and FDs.
8.3.3.3 Cable segregation
8.3.3.3.1 Requirements
No additional requirements.
8.3.3.3.2 Recommendations
No additional recommendations.
8.3.3.4 Protection of installed cabling (including security)
8.3.3.4.1 Requirements
No additional requirements.
8.3.3.4.2 Recommendations
Cabling less than 2,7 m above the finished floor should be installed in secure pathway systems (such as
duct, trunking or conduit) or apply alternate means to prevent accidental and/or intentional damage to the
installed cabling.
Any maintenance holes, hand-holes and draw-boxes in unsecured areas should be locked (requiring keys or
tools for access) and monitored by a security system using a camera, remote alarm or both.
8.3.4 Pathway systems
8.3.4.1 External service pathways systems
8.3.4.1.1 Requirements
No additional requirements.
8.3.4.1.2 Recommendations
The number of pathway systems required within each of the building entrance pathways depends on the
number of external service providers and the number and type of cables that the external service providers
will install.
The entrance pathway systems should have adequate capacity to handle growth and additional external
service providers.
8.3.4.2 Office pathway systems
8.3.4.2.1 Requirements
The weight of fully loaded pathway systems shall be evaluated and co-ordinated with:
a) the structural engineer if the pathway systems are to be supported from the ceiling (the ceiling shall have
a minimum hanging capacity of 1,2 kPa);
b) the access floor system designer if the pathway systems are to be supported by the access floor system.
8.3.4.2.2 Recommendations
Separate pathway systems should be installed to segregate cabling that is permanently installed cabling
from that which is less permanent such as equipment cords and patch cords.
Access floor systems, also known as raised floor systems, should be used for cabinets, frames or racks that
are to be cabled from below.
Under-floor cable tray routing should be co-ordinated with other under floor systems during the planning
stages of the building.
If pathway systems are to be suspended from the ceiling, the ceiling should have a minimum hanging
capacity of 2,4 kPa.
The size and quantity of all pathway systems should take into account the volume of cables to be contained
at maximum planned utilisation. Particular attention is required for adequate capacity of pathways at
intersections.
8.3.4.3 Access floor tile openings
8.3.4.3.1 Requirements
The area of the access floor tile opening shall be twice the cross-sectional area of the cables to be installed
when the cabinets or frames are at full capacity.

– 15 – EN 50174-2:2009/A1:2011
NOTE If the floor opening uses grommets or brushes, the size of the opening may need to be increased to accommodate the support
mechanisms for the grommets and brushes.
8.3.4.3.2 Recommendations
Access floor tile openings for cabinets should be placed under the intended location of the cabinets or in
locations where the opening will not create a tripping hazard.
Access floor tile openings should:
a) be no larger than required and should use gaskets, brushes, or other method to minimize loss of under-
floor pressure;
b) have edging or grommets along all cut edges that does not interfere with placement of frames and
cabinets;
c) the edging or grommets should not be placed where cabinets, frames or racks are intended to be in
contact with the surface of the access floor.
Access floor tile openings for frames should be placed either under the vertical cable managers between the
frames or under the frame (at the opening between the bottom angles). Generally, placing the opening under
the vertical cable managers is preferable as it allows equipment to be located at the bottom of the frame.
8.3.5 Cable management systems
8.3.5.1 Overhead systems
8.3.5.1.1 Requirements
No additional requirements.
8.3.5.1.2 Recommendations
Planning of overhead cable trays for information technology cabling should be co-ordinated with architects,
mechanical engineers and electrical engineers that are designing lighting, plumbing, air ducts, power supply
and fire protection systems.
Overhead cable management systems may be stacked to provide additional capacity.
Cable management systems should be suspended from the ceiling where increased operational flexibility is
required to:
a) support the use of cabinets, frames and racks of various heights;
b) add and/or remove cabinets, frames and racks.
Cable management systems may be attached to the tops of cabinets, frames and racks where the cabinets,
frames or racks are of uniform height and are capable of supporting the additional loads of the cable
management systems and the installed cables.
Fire extinguishing systems should not be placed directly above cable management systems.
8.3.5.2 Under-floor systems
8.3.5.2.1 Requirements
No additional requirements.
8.3.5.2.2 Recommendations
Information technology cabling under the access floor should be installed in cable management systems that
do not block airflow.
There should be adequate clearance between the top of open cable management systems (e.g. tray, basket,
etc.) and the access floor tiles to allow the cables to enter/exit the pathway systems without risk of damage
and in accordance with the applicable minimum bend radius (installation, operating-static and operating-
dynamic).
Where cable management systems are vertically stacked and run in parallel to provide additional capacity:
a) access to lower layers should be provided by either using narrower cable management systems for
upper layers (as shown in Figure 9) or by providing an accessible row of adjacent tiles (as shown in
Figure 10);
b) at least 300 mm vertical separation should be provided between each layer to provide adequate access
to lower layers for addition and removal of cables.
AACCCCEESSSS FLO FLOOORR TITILLEE ACACCECESSSS F FLLOOOORR T TIILLEE
5500 m mmm c clleaearraancncee
toto p peerrmmiitt ccaabblleess
toto e exxiitt t trraayy
CACABBLLEESS
CACABLEBLESS
SUSUPPPPOORRTT S STTRRUUTT SUSUPPPPOORRTT ST STRRUUTT
NNARRARROWOWERER
303000 3300 m00 mmm c clleeaarrancance bete betwweeenen
UPUPPERPER TR TRAYAYS S
mmmm ssttacackkeedd par paraallellel tl trrayayss
PRPROOVVIIDDE AE ACCCCEESSSS
TOTO LO LOWEWERR TTRRAYAYSS
CACABBLLEESS CACABLEBLESS
SSUUPPPPOORRTT S STTRUTRUT
SSUUPPPPOORTRT S STTRUTRUT
Figure 9 – Example of layered cable trays with smaller width upper trays
EQEQUUIIPMPMENENTT CCAABBIINNEETSTS
PEPEDDEESSTTAALL
PEPEDDEESTSTAALL
PEPEDDEESTSTAALL
EQEQUIUIPPMMENTENT CCABABIINNEETTSS

– 17 – EN 50174-2:2009/A1:2011
ACACCECESSSS F FLLOOOORR TTIILLEE ACACCECESSSS F FLLOOOORR T TIILLEE
5050 m mmm cclleeaarraancncee
ttoo pe perrmmitit ccaablbleess
toto e exxiitt ttrraayy
CCAABLBLESES
SUSUPPPPOORRTT ST STRRUUTT
AIAISLSLE LE LEEFFTT
OPOPENEN T TOO P PRROOVVIIDDEE
330000 m mmm c clleaearraancncee b beettwweeeenn
ssttacackkeed pd paarraallllel tel trraayyss mmmm ACACCECESSSS T TOO
LOWER TRAY
& SPACE BELOW
TRAYS
CACABLBLESES
SSUUPPPPOORRTT ST STRRUUTT
Figure 10 – Example of accessible row of floor tiles to provide access to lower tray
8.3.6 Closures
No additional requirements.
8.3.7 Cabling
No additional requirements.
8.3.8 Spaces
8.3.8.1 General
8.3.8.1.1 Requirements
Where risk of water ingress exists, a means of evacuating water from the space(s) shall be provided. Where
floor drains are used they shall be fitted an ingress blocking facility.
Access to the designated spaces shall be controlled by the premises owner. Within the designated spaces,
additional systems shall be considered to limit access to specific elements of the cabling infrastructure.
8.3.8.2 Entrance rooms
8.3.8.2.1 Requirements
The number and size of entrance rooms shall be determined taking into consideration:
a) cabling lengths for external service providers circuits;
b) requirements for redundancy;
c) requirements for compartmentation between different external service providers;
EQEQUUIIPMPMENTENT CCABABIINNEETTSS
DD
PEPE ESTESTAALL
PEPEDDEESSTTAALL
PEDPEDESESTTAALL
UU PP TCTCAA ININ
EQEQ II MEMENN BB ETETSS
d) predicted requirements for:
1) entrance pathways for external service provider and premises cabling (e.g. campus cabling for
generic cabling in accordance with the EN 50173 series);
2) backboard and frame space for termination of external service provider and premises cabling;
3) external service provider cabinets and racks to accommodate, as required;
4) space for the presentation of the cable terminations of the external service providers;
5) space for the presentation of equipment ports;
6) surge protection devices.
Typical information necessary to Information required to determine the requirements for entrance rooms is
shown in Table 7.
Table 7 – Environmental requirements for office premises
Information provided to external service providers Information provided by external service providers
General information concerning other uses of the building, Space and mounting requirements for surge protection
including other tenants equipment on incoming metallic cables
Plans of entrance pathways from the boundary of the Quantity and dimensions of access provider racks and
premises to the entrance room, including location of cabinets
maintenance holes, hand-holes and draw-boxes
Floor plans for the BEF and entrance room Power requirements for equipment, including receptacle
types
Assigned location of the external service providers Service clearances
protectors, cabinets, racks or frames
Cable pathways within entrance room (under access floor, Installation schedule
overhead cable ladders, other)
Requested location and interface for demarcation of each Service schedule
type of circuit to be provided by the external service provider
(for generic cabling)
8.3.8.2.2 Recommendations
No additional recommendations.
8.3.8.3 Spaces containing cabinets, frames or racks housing cabling components
8.3.8.3.1 Requirements
Spaces intended to contain metallic cabling shall be located away from sources of electromagnetic
interference. Examples of such noise sources include electrical power supply transformers, motors and
generators, x-ray equipment, radio or radar transmitters, and induction sealing devices.
Piping systems other than those providing necessary services to the space (e.g. sprinkler systems and
cooling systems) shall not pass through the space.
Floor loading capacity shall be sufficient to bear both the distributed and concentrated load of the installed
equipment with associated cabling and media. The minimum distributed floor loading capacity shall be
5,0 kPa.
Consideration should also be given to the floor loadings generated through the transit of equipment and
associated infrastructure.
Spaces in which cables are routed to cabinets, frames, or racks using under-floor pathways shall be
provided with raised floor with an under-floor depth of no less than 200 mm.

– 19 – EN 50174-2:2009/A1:2011
Where cables are routed using high-level or ceiling-mounted pathway systems, the height of cabinets,
frames and racks shall not exceed 75 % of the unobstructed height between the finished floor and any
overhead objects such as sprinklers, lighting fixtures, or cameras. Unless the range of cabinets, frames and
racks to be used is to be restricted, spaces shall provide a minimum of 2,6 m unobstructed height.
NOTE The use of overhead pathway systems or cabinets, frame and racks taller than 2,13 m may necessitate increased
unobstructed height requirements.
While access is required to cabinets, frames, and racks, lighting shall provide a minimum of 500 lux
measured 1 m above the finished floor in front (and at the rear, if applicable) of the cabinets, frames, and
racks.
8.3.8.3.2 Recommendations
Spaces should be located centrally in the area they serve.
Positive air pressure systems (including appropriate filters) should be used to prevent ingress of dust and
other contamination to the space.
Any water and drain pipes that pass through the space should be located away from and not directly above
cabling or equipment.
Consideration should be given to application of floor covering comprised of anti-static material (see
EN 50174-1).
Spaces in which cables are routed to cabinets, frames, or racks using under-floor pathways should be
provided with raised floor with an under-floor depth of no less than 300 mm.
Ceiling height should be 3 m minimum to allow the installation of:
a) widest range of cabinets, frames and rack heights;
b) high-level or ceiling-mounted pathway systems.
8.3.8.4 Rooms containing cabinets, frames or racks housing cabling components only
8.3.8.4.1 Requirements
No additional requirements.
8.3.8.4.2 Recommendations
The following recommendations are in addition to those of 8.3.8.3.2.
Rooms should be provided with doors that:
a) are 1 m wide and 2,13 m high (min.);
b) do not have a doorsill;
c) are fitted with a lock or locking system;
d) have either no centre post or a removable centre post to facilitate access for large equipment.
Floors, walls and ceilings should be selected and treated to minimise the generation of dust.
To provide additional space for installation and maintenance, the room dimensions should be 3 m × 2 m
(min.).
To provide additional space for installation and maintenance, the minimum dimensions to house
cabinets/frames/racks containing up to 500 termination points should be 3,2 m (length) × 2,2 m (width) (see
Figure 11a)).
For more than 500 termination points, the minimum room size should be increased by 0,8 m along the line of
cabinets for each additional group of up to 500 termination points (see Figure 11b)).
NOTE These recommendations are based on the use of 800 mm × 800 mm cabinets within unrestricted height spaces (see 8.3.8.3.1)
that allow for sufficient cord management for fully utilized cabinets or open racks with vertical cable management for sufficient cord
management for fully utilized racks, this will also accommodate access from both front and back of the cabinets or rack to install
additional cabling.
0,8 m 0,8 m 0,8 m
3,2 m 3,2 m
2,2 m
3,0 m
a) up to 500 termination points b) up to 1 000 termination points
Figure 11 – Minimum dimensions for rooms housing cabling components only
8.3.8.5 Rooms containing cabinets, frames or racks housing active equipment in addition to
cabling components
8.3.8.5.1 Requirements
The following requirements are in addition to those of 8.3.8.3.1 and 8.3.8.4.1.
The temperature and humidity shall be maintained to allow continuous operation of the active equipment.
Adequate power supply shall be provided
8.3.8.5.2 Recommendations
The following recommendations are in addition to those of 8.3.8.3.2 and 8.3.8.4.2.
To provide additional space for equipment installation and maintenance, the room dimensions should be
3 m × 3 m (min.).
To provide additional space for equipment installation and maintenance, the minimum dimensions to house
cabinets/frames/ racks containing up to 500 termination points should be 3,2 m (length) × 3 m (width) (see
Figure 12a)).
For more than 500 termination points, the minimum room size should be increased by 1,6 m along the line of
cabinets for each additional group of up to 500 termination points to accommodate the additional space for
connecting hardware, cord management and active equipment (see Figure 12b)).
NOTE These recommendations are based on the use of 800 mm × 800 mm cabinets within unrestricted height spaces (see 8.3.8.3.1)
that allow for sufficient cord management for fully utilized cabinets or open racks with vertical cable management for sufficient cord
management for fully utilized racks, this will also accommodate access from both front and back of the cabinets or rack to install
additional cabling.
– 21 – EN 50174-2:2009/A1:2011
0,8 m 0,8 m 0,8 m 0,8 m 0,8 m 0,8 m
3,2 m 3,2 m
3,0 m 4,6 m
a) up to 50
...