Cable tests that are not equivalent, and why
IEC 60332-3-24 (cat. C) ≠ IS 10810-61
Not equivalent, because IS 10810-61 is a tube test with its own fire and no IEC counterpart: an Indian FR or FRLS claim that rests on it says nothing about IEC 60332-3 or a CPR class.
IEC 60332-3-24 (cat. C)
- 1.5 litres of non-metallic material per metre on a vertical ladder, 20 min of flame. Sources: IEC 60332-3-24:2000+A1:2008 (edition 1.1, 2009-02), Table A.1 p. 12; cl 5.1 p. 7; cl 5.3 pp. 8-9; Annex A p. 12; Annex B p. 13 (informative); cl 7 (read in the standard)
- Pass: char height at most 2.5 m above the burner. Sources: IEC 60332-3-24:2000+A1:2008 (edition 1.1, 2009-02), Table A.1 p. 12; cl 5.1 p. 7; cl 5.3 pp. 8-9; Annex A p. 12; Annex B p. 13 (informative); cl 7 (read in the standard)
IS 10810-61
- A cable or a small bundle (up to 35 mm) hung in a vertical steel tube of 125 mm diameter over an ethanol fire, for t = K + D/5 min; it must go out by itself. Sources: IS 10810 (Part 61):1988, Ed. 1.1 (2004), cl. 4, 6.1, 6.2, 8.1, 8.2 and the explanatory note, pp. 1-3 (read in the standard)
- The method is the Swedish chimney test SS 424 14 75; it has no IEC counterpart, and no CPR class rests on it. Sources: IS 10810 (Part 61):1988, Ed. 1.1 (2004), cl. 4, 6.1, 6.2, 8.1, 8.2 and the explanatory note, pp. 1-3 (read in the standard)
Values as the sources print them, every one with its source and how it was seen; where a value is not held, it says so. The cable's own standard and the specification decide which test applies.
Questions and answers
Is IS 10810-61 equivalent to IEC 60332-3-24 (cat. C)?
No. IS 10810-61 is a tube test with its own fire and no IEC counterpart: an Indian FR or FRLS claim that rests on it says nothing about IEC 60332-3 or a CPR class.