NEC and IEC 60346 equivalent

OrlandoCB

Member
Location
CA
Good evening folks !

Im currently reviewing a Project made by Spanish contractors in Mexico (funny isn't it ?),

These guys used the IEC 60346-5 for their wiring calculations instead of the Mexican nom (The mexican nom is a copy of NEC 2011 so ill just refer as NEC now),
We are trying to see if they do match,
As far as I can see temperature derrating is the same on both normatives, yet when you get to 60346 table B52.20 for grouping it gets interesting, link to that table below
https://www.ti-soft.com/en/support/help/electrical/reference/iec-60364-5-52/cables-installed-in-air/correction-factor-k2/table-b_52_20

Correct me if im wrong but what we use for grouping is 310.15 (b)(3)(a), and its totally different for the table used in this project per IEC, and I do not recall something similar in the NEC.

Have any of you guys come across projects like these where IEC is used instead of NEC?
Any recommendations
 
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