IEC 60245-2:1998 pdf download – Rubber insulated cables – Rated voltages up to and including 450/750 v-Part 2: Test methods

IEC 60245-2:1998 pdf download – Rubber insulated cables – Rated voltages up to and including 450/750 v-Part 2: Test methods.
This part of IEC 60245 gives the test methods specified in all parts of IEC 60245 as far as not laid down in IEC 60811.
1.2 Normative references
The following normative documents contain provisions which, through reference in this text. constitute provisions of this part of lEG 60245. At the time of publication, the editions indicated were valid. All normative documents are subject to revision and parties to agreements based on this part of IEC 60245 are encouraged to investigate the possibility of applying the most recent editions of the normative documents listed below. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 60245-1:1994, Rubber insulated cables — Rated voltages up to and including 450/750 V — Part 1: General requirements
IEC 60245-3:1994, Rubber insulated cables — Rated voltages up to and including 450/750 V — Part 3: Heat resistant silicone insulated cables
lEG 60245-4:1994, Rubber insulated cables — Rated voltages up to and including 450/750 V — Part 4: Cords and flexible cables
IEC 60245-8:1997, Rubber insulated cables — Rated voltages up to and including 450/750 V — Part 8: Cords for applications requiring high flexibility
IEC 60332-1 :1993, Tests on electric cables under fire conditions — Part 1: Test on a single vertical insulated wire or cable
IEC 60811-1-1:1993, Common test methods for insulating and sheathing materials of electric cables — Part 1: Methods tar general application — Section 1: Measurement of thickness and overall dimensions — Tests for determining the mechanical properties
IEC 60811-1-2:1985, Common test methods for insulating and sheathing materials of electric cables — Part 1: Methods for general application — Section 2: Thermal ageing methods
Amendment 1 (1989)
ISO 1302:1992, Technical drawings — Method of indicating surface texture
1.3 ClassifIcation of tests according to the frequency with which they are carried out The tests specified are type tests (symbol T) and/or sample tests (symbol S) as defined in 2.2 of IEC 60245-1.
The symbols T and S are used in the relevant tables of the particular specifications (IEC 60245-3. 60245-4, etc.).
1.4 Sampling
If a marking is in relief in insulation or sheath the samples used for the tests shall be taken so as to include such marking.
For multicore cables, except for the test specified in 1 .9, not more than three cores (of different colours, if applicable) shall be tested unless otherwise specified.
1.5 Pre-conditioning
All the tests shall be carried out not less than 16 h after the vulcanization of the insulating or sheathing compounds.
1.6 Test temperature
Unless otherwise specified, tests shall be made at ambient temperature.
1.7 Test voltage
Unless otherwise specified, the test voltages shall be a.c. 49 Hz to 61 Hz of approximately sinewave form, the ratio peak value/r.m.s. value being equal ‘J with a tolerance of ±7 %.
The values quoted are r.m.s. values.
1.8 Checking of the durability of colours and markings
Compliance with this requirement shall be checked by trying to remove the marking of the manufacturer’s name or trade mark and the colours of cores or numerals by rubbing lightly ten times with a piece of cotton wool or cloth soaked in water.
1.9 Measurement of thickness of insulation
1.9.1 Procedure
The thickness of insulation shall be measured in accordance with 8.1 of IEC 60811-1-1. One sample 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 five cores of cables with more than five cores.
If withdrawal of the conductor is difficult, it shall be stretched in a tensile machine or the piece of core shall be immersed in mercury until the insulation becomes loose.