IEC TR 62362 pdf download – Selection of optical fibre cable specifications relative to mechanical, ingress, climatic or electromagnetic characteristics – Guidance

IEC TR 62362 pdf download – Selection of optical fibre cable specifications relative to mechanical, ingress, climatic or electromagnetic characteristics – Guidance
1 Scope
The purpose of this guidance is to provide information on the specification of optical fibrecables with respect to the mechanical，ingress，climatic or electromagnetic characteristics(MICE) as classified within ISO/IEC 24702.
ln this classification system each letter of the four initials of the acronym are subscripted witha value of from one to three to indicate different severities. The current attributes andseverities are found in Annex A.
2 Normative references
The following referenced documents are indispensable for the application of this document.For dated references,only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60794-1-2,Optical fibre cables – Part 1-2: Generic specification – Basic optical cable testprocedures
IEC 60794-2(all parts),Optical fibre cables – Part 2: Indoor optical fibre cablesIEC 60794-3(all parts),Optical fibre cables – Part 3: Outdoor cables
ISo/IEC 24702,Information technology – Generic cabling – Industrial premisesISO/IEC 11801,Information technology – Generic cabling for customer premises
3Acronyms
MICE Mechanical, ingress, climatic and chemical, electromagnetic
4MICE attributes and severities
4.1General
The MICE classification system has three levels of severity:
– the first level of severity (MnliC1E1) describes a typical environment such as that assumedwithin ISO/IEC 11801; (i.e. office premises etc.);
– the second level of severity (MzlzC2E2)describes a worst-case light industrial environment;- the third level of severity (MslsC3E3) describes a worst-case industrial environment.
See Annex A for a more detailed description of the MlCE severity levels.
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4.2Mechanical
4.2.1 Shock/bump
Shock and bump are not specified for optical fibre cables. They are inherently robust in thisrespect.A more important attribute is bending.
4.2.2vibration
Vibration in the industrial premises (as opposed to wind induced vibration on aerially deployedcables) is not specified for optical fibre cables. They are inherently robust in this respect.
4.2.3Tensile force
For outdoor premises cables specified in lEC 60794-3 series,manufacturers specify a ratedtensile force. The requirement is that the fibre shall not exceed a percentage of the proof teststrain (to be agreed between customer and supplier) when the cable is tested at the ratedload.
For indoor cables，the different family specifications of lEC 60794-2 series have differentrequirements on the tensile load.
4.2.4Crush
For optical fibre cables,the crushing force is applied in a plate to plate test.
For indoor cables,crush is specified at 500 N. For outdoor cables，different levels arespecified depending on whether the cable is armoured or not.For unarmoured cable,valuesof between 1 500 N and 3 0o0 N may be specified.For armoured cable，values between2 200 N and 10 0o0 N may be specified.
4.2.5lmpact
For indoor cables a value of 1 J with a 12,5 mm radius is specified.For un-armoured outdoorcables, a value of either 10 J with a 300 mm radius or 3 J with a 10 mm radius is specified.4.2.6Bending, flexing and torsion
All the family specifications have requirements on these attributes.
For bending， there are multiple tests such as bending under tension,repeated bending andsimple bending. The bending diameter is typically 20 times the cable diameter.
For torsion，the test length，load,and number of turns varies depending on the familyspecification.For indoor cables, the length is from 250 mm to 1 000 mm, loaded at 20 N with20 cycles applied.
4.3Ingress
4.3.1 Basic consideration
Optical fibre cables come in a variety of constructions.Some examples are slotted core, loosetube,tight buffered.The slotted core and loose tube can be filled or unfilled. These differentconstructions have different ingress characteristics.
4.3.2Particulate ingress
Particulate ingress is not specified for optical fibre cables.They are inherently robust in thisrespect.