IEC 60227-2-2003 pdf free download – Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V – Part 2: Test methods.
The methods of carrying out the tests specified in all parts of lEC 60227 are given in this partand the following publications:
IEC 60227-1:1993，Polyvinyl chloride insulated cables of rated voltages up to and including450/750 v – Part 1: General requirements
IEC 60332-1:Tests on electric cables under fire conditions – Part 1: Test on a single verticalinsulated cable
IEC 60811-1-1:1993,Common test methods for insulating and sheathing materials of electricalcables – Part 1: Methods for general application – Section 1: Measurement of thickness andoverall dimensions – Test for determining the mechanical properties
1.2Applicable tests
The tests applicable to the types of cables are given in the particular specifications (IEC 60227-3,IEC 60227-4, etc.).
1.3Classification of tests according to the frequency with which they are carried outThe tests specified are type tests (symbol T) and/or sample tests (symbol S) as defined in 2.2of lEC 60227-1.
The symbole T and s are used in the relevant tables of the particular specifications (IEC 60227-3,IEc 60227-4, etc.).
1.4Sampling
lf a marking is in relief in the insulation or sheath, the samples used for the tests shall be takenso as to include such marking.
For multicore cables, except for the test specified in 1.9, not more than three cores (of differentcolours, if applicable) shall be tested unless otherwise specified.
1.5Pre-conditioning
All the tests shall be carried out not less than 16 h after the extrusion of the insulating orsheathing compounds.
1.6Test temperature
Unless otherwise specified, tests shall be made at ambient temperature.
1.7Test voltage
Unless otherwise specified, the test voltages shall be a.c. 49 Hz to 61 Hz of approximatelysine-wave form, the ratio peak valuel/r.m.s. value being equal to .2 with a tolerance of±7 %.
The values quoted are r.m.s. values.
1.8Checking of the durability of colours and markings
Compliance with this requirement shall be checked by trying to remove the marking of themanufacturer’s name or trade mark and the colours of cores or numerals by rubbing lightly tentimes with a piece of cotton wool or cloth soaked in water.
1.9Measurement of insulation thickness
1.9.1 Procedure
The thickness of insulation shall be measured in accordance with 8.1 of lEC 60811-1-1.Onesample of cable shall be taken from each of three places, separated by at least 1 m.
Compliance shall be checked on each core of cables having up to five cores, and on any fivecores of cables with more than five cores.
lf withdrawal of the conductor is difficult, it shall be stretched in a tensile machine or the pieceof core shall be loosened by stretching or some other suitable means that does not damage theinsulation.
1.9.2Evaluation of results
The mean of the 18 values (expressed in millimetres) obtained from the three pieces ofinsulation from each core shall be calculated to two decimal places and rounded off as givenbelow, and this shall be taken as the mean value of the thickness of insulation.
lf in the calculation the second decimal figure is 5 or more,the first decimal figure shall beraised to the next number, thus, for example,1,74 shall be rounded off to 1,7 and 1,75 to 1,8.
The lowest of all values obtained shall be taken as the minimum thickness of insulation at anyplace.
This test may be combined with any other measurements of thickness，for instance those of5.2.4 of IEc60227-1.
1.10 Measurement of sheath thickness1.10.1 Procedure
The thickness of sheath shall be measured in accordance with 8.2 of lEC 60811-1-1.
One sample of cable shall be taken from each of three places, separated by at least 1 m.
1.10.2Evaluation of results
The mean of all the values (expressed in millimetres) obtained from the three pieces of sheath shall be calculated to two decimal places and rounded off as given below, and this shall be taken as the mean value of the thickness of sheath.IEC 60227-2 pdf download.