Derating Factors for cables in Cable Trench - IEC Table A.52.3

[NickParker]

Which method of Installation to be followed, which are mentioned in the IEC 60364-5-52 table A.52.3 for consideration of derating factors for cables laid in
1) Concrete cable trench covered with removable concrete slabs.
2) Concrete cable trench covered with removable steel chequered plates.

 

[7anoter4]

In my opinion -see Table 52.3[not A52-3] pos. 40 for concrete slabs and 50 or 51 for chequered plates

 

[7anoter4]

Sorry. I have 2001 edition with me. In 2009 edition A.52.3 is the same as 52.3.