GUYMASTER Release Notes
For version 4.0.6 as of December 15, 2013

 

The following items were changed according to the final release of CAN/CSA-S37-13 standard:

    1. The N value, subcritical N < 3.25 instead of N < 3.5

                        supercritical N > 6.5 instead of N > 7.2         

    2. Ca factor was added in calculation of N , = D(q Cg Ce Ca)^0.5    

    3. Cd factor for transmission line cluster in iced condition was changed from 1.5 to 1.2 

 

Users have found that in some cases the loads on appurtenances in S37-13 are higher than in S37-01. This is due to the new 
drag coefficients, Cd, in S37-13 for flat elements with aspect ratios >10, which are higher than the 1.5 used in S37-01. 
Of course, for those with aspect ratios less than 10, there will be a decrease in 
drag coefficient (see Table 2 - drag coefficient, Cd, for attachments).