SIST EN 300 119-5 V1.2.2:2006

• Abstract:

  A standard for the thermal management of racks and cabinets defining preferred solutions for the removal of heat dissipated by one or more subracks in an ETSI rack. For example: air flow, direction of air, air velocity, permitted air temperature, necessity and type of air baffle. The starting point for the standard is to consider the ETSI mechanical dimensions as a non-modifiable item. The standard also has to define a possible preferred range for the power dissipation within an ETSI miscellaneous rack depending on different standardized solutions. The standards should be applicable to telecommunication and ITE equipment from different suppliers designed for the installation in an ETSI rack.

• Status: Published
• Publication Date: 31-Jan-2006
• ICS: 19.040 - Environmental testing
• ICS: 33.050.01 - Telecommunication terminal equipment in general
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Feb-2006
• Due Date: 01-Feb-2006
• Completion Date: 01-Feb-2006
• Ref Project: ETSI EN 300 119-5 V1.2.2 (2004-12) - Environmental Engineering (EE); European telecommunication standard for equipment practice; Part 5: Thermal management

Overview

SIST EN 300 119-5 V1.2.2:2006 is a standard that specifies requirements and preferred solutions for the thermal management of telecommunications equipment racks and cabinets, particularly those following ETSI rack mechanical dimensions. Developed by the Slovenian Institute for Standardization (SIST), this standard is aligned with EN 300 119-5 and provides guidance for ensuring consistent and effective removal of heat dissipated by subracks within telecommunication and information technology equipment (ITE) enclosures.

This document is essential for manufacturers, integrators, and operators concerned with maintaining optimal thermal conditions in environments that house multiple pieces of telecommunication equipment from various suppliers, thereby protecting system reliability and safety.

Key Topics

• Thermal Management Solutions: The standard covers air flow routes, air velocity, air temperature, and the necessity and types of air baffles and vents for ETSI racks and cabinets.
• Equipment Characterization Data: Outlines the information manufacturers must provide, including physical geometry, power dissipation, vent/grill types, and airflow directions.
• Natural and Forced Convection: Distinguishes between equipment cooled by natural convection and those utilizing built-in fans (forced convection), and specifies data requirements for both.
• Micro-Climate Considerations: Emphasizes the need to manage localized temperature variations within enclosures.
• Safety: References appropriate safety guidelines-ensuring touchable parts' temperature remains within safe limits, and that issuing air does not reach temperatures that could damage cables.
• Configuration and Integration: Addresses the integration of various manufacturers' equipment within a single ETSI rack and the impact on overall thermal management.

Applications

The practical applications of SIST EN 300 119-5 V1.2.2:2006 are significant for:

• Telecommunications Infrastructure: Used in both public and private networks, particularly where equipment from multiple vendors is co-located in standardized racks.
• Data Centers: Ensures that thermal management practices support high equipment density while limiting thermal interference between devices.
• Network Equipment Design: Guides manufacturers in the design of compliant subracks and cabinets, promoting interoperability and reliability.
• Facility Planning and Integration: Provides integrators and operators with the necessary data to arrange equipment for optimal airflow, minimize hotspots, and select appropriate cooling enhancements like fan trays or air filters.
• Compliance and Safety: Supports adherence to European and international safety and environmental standards covering telecom and IT equipment installations.

Related Standards

Stakeholders should be aware of related standards which complement and reference SIST EN 300 119-5 V1.2.2:2006:

• EN 300 019: Environmental conditions and tests for telecommunications equipment, relevant to defining operational environments.
• EN 60950-1: Safety of information technology equipment.
• EN 300 119-1: Introduction and terminology for equipment practice.
• EN 300 119 (series): Overall European telecommunication standards for equipment practice.
• EN 300 019-1-3: Specifies classification of environmental conditions for stationary use at weather-protected locations.
• ETSI TR 102 489: Guidance on thermal management for equipment and deployment scenarios.
• IEC 60721: Classification of environmental conditions (bibliographic reference).

Practical Value

Implementing SIST EN 300 119-5 V1.2.2:2006 ensures that telecommunication racks and cabinets are designed and managed to effectively dissipate heat, reduce equipment failure risks, and maintain safety for personnel and infrastructure. This standard supports interoperability, lowers operational risks, and contributes to increased uptime in telecommunications and IT installations.

By adhering to these guidelines, organizations can achieve reliable, efficient, and future-proof network infrastructure capable of accommodating technological advancements and increasing power densities.

SLOVENSKI STANDARD
01-februar-2006
Okoljski inženiring (EE) – Evropski telekomunikacijski standard za prakso pri
opremi – 5. del: Ravnanje s toplotnimi lastnostmi opreme
Environmental Engineering (EE); European telecommunication standard for equipment
practice; Part 5: Thermal management
Ta slovenski standard je istoveten z: EN 300 119-5 Version 1.2.2
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
33.050.01 Telekomunikacijska Telecommunication terminal
terminalska oprema na equipment in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

European Standard (Telecommunications series)

Environmental Engineering (EE);
European telecommunication standard
for equipment practice;
Part 5: Thermal management
2 ETSI EN 300 119-5 V1.2.2 (2004-12)

Reference
DEN/EE-TMG002
Keywords
environment, management, equipment practice,
rack
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ETSI
3 ETSI EN 300 119-5 V1.2.2 (2004-12)
Contents
Intellectual Property Rights.4
Foreword.4
Introduction .4
1 Scope.5
2 References.5
3 Definitions and abbreviations.5
3.1 Definitions.5
3.2 Abbreviations.6
4 General requirements.6
4.1 Thermal performance.6
4.2 Temperature of touchable parts .6
4.3 Temperature of issuing air.6
5 Thermal management.6
5.1 Subrack air flow paths.6
5.2 ARCM air flow paths .7
Annex A (normative): Equipment characterization data to be provided by the
manufacturer.8
A.1 General identification.8
A.1.1 Identification.8
A.1.2 Physical geometry.8
A.2 Equipment in natural convection.9
A.2.1 Temperature measurements.9
A.3 Equipment with built-in fans - forced convection.9
A.3.1 Temperature and air velocity measurements .10
A.4 Additional data for an MRC and ancillary components.10
A.4.1 MRC.10
A.4.2 Fan tray.11
A.4.3 Fan tray flow and heat transfer.11
A.4.4 Air filter.11
Annex B (informative): Bibliography.12
History .13

ETSI
4 ETSI EN 300 119-5 V1.2.2 (2004-12)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Environmental
Engineering (EE).
The present document is part 5 of a multi-part deliverable. Full details of the entire series can be found in part 1 [3].
The present document applies to all telecommunications rack/cabinet; miscellaneous rack/cabinets and subracks
forming part of the public telecommunications network.

National transposition dates
Date of adoption of this EN: 10 December 2004
Date of latest announcement of this EN (doa): 31 March 2005
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 30 September 2005
Date of withdrawal of any conflicting National Standard (dow): 30 September 2005

Introduction
The power density of equipment has been rising and will continue to do so for the foreseeable future. Equipment
suppliers have tried to overcome their thermal issues in isolation resulting in different solutions being developed. When
different racks from various suppliers are co-located they can have a detrimental effect on each other. The present
document specifies the thermal management requirements to prevent equipment having a detrimental thermal influence
on surrounding equipment.
ETSI
5 ETSI EN 300 119-5 V1.2.2 (2004-12)
1 Scope
The present document specifies the preferred thermal management solutions for subracks, racks/cabinets and
miscellaneous racks/cabinets (as described in EN 300 119 series [5]) installed indoors in restricted access locations (as
defined in EN 60950-1 [2]), for the removal of heat dissipated by one or more subracks in an ETSI rack.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
[1] ETSI EN 300 019: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment".
[2] CENELEC EN 60950-1: "Information technology equipment - Safety - Part 1: General
requirements".
[3] ETSI EN 300 119-1: "Environmental Engineering (EE); European telecommunication standard for
equipment practice; Part 1: Introduction and terminology".
[4] ETSI EN 300 019-1-3: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 1-3: Classification of environmental
conditions; Stationary use at weatherprotected locations".
[5] ETSI EN 300 119: "Environmental Engineering (EE); European telecommunication standard for
equipment practice".
[6] ETSI TR 102 489: "Environmental Engineering (EE); European telecommunications standard for
equipment practice; Thermal Management Guidance for equipment and its deployment".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
ambient: spatial maximal temperature of the air entering the rack/cabinet
cabinet: free-standing and self-supporting enclosure for housing electrical and/or electronic equipment
NOTE: It is usually fitted with doors and/or panels, which may or may not be removable.
equipment: for the purposes of EN 300 119-5, the term equipment shall mean equipped subracks, racks/cabinets and
miscellaneous racks/cabinets
integrator: end user/operator of telecommunication or IT equipment or their agent (for example, an equipment
manufacturer could be an operator's agent)
ETSI
6 ETSI EN 300 119-5 V1.2.2 (2004-12)
micro-climate: conditions found within the rack/cabinet creating a local ambient for
...