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Joined: Feb 2003
Posts: 231
R
RobbieD Offline OP
Member
Just seeing what the opinion of others is with information on voltage drop in the CEC. Tables D3&D4 are great but there is no table for three phase. I wonder why they didn't put a table or some information to use so you can calculate the voltage drop.
The formula VD= (1.73)(K)(L)(I) divided by CM is nowhere to be found in the CEC. I have not found the K values at different temperatures in the CEC. Also in the CEC there is no longer the CM of the wire, Table D5 only gives the conductor area in mm2. I know that there used to be more information on this matter in older code books but was taken out of newer ones. Why don't they put a table in the CEC that displays the metric formula for calculating voltage drop in three phase circuits along with the K values of conductors at different temperatures? Maybe I'm just missing a page or something. What do you guys think? Hopefully this starts people talking on this great site.

Joined: Mar 2004
Posts: 947
T
twh Offline
Member
With the CEC we don't actually calculate voltage drop. I think it's more of a wire size calculation to limit the voltage drop, and it's fairly involved.

The correction from Table D3 to three phase is to multiply the distance by 1.15.

Here is my understanding of the correct calculation

Joined: Feb 2003
Posts: 231
R
RobbieD Offline OP
Member
I know that we don't have to calculate this all the time but it would still be nice to be able to do this with the CEC. With information provided in the book and not relying on a computer. Times it by 1.15 works great but what if there is a different abient temp. and K values change. All I am saying is that there should be more info in the book.

Joined: Mar 2004
Posts: 947
T
twh Offline
Member
That is how you do it using the CEC and it includes ambient temperature.

The rules are a mess and I don't know what to do about it. I'm not sure this is the solution, but it does walk you through the calculations.

Maybe we should push for an amendment to Appendix B?

Joined: Jul 2005
Posts: 5
M
Junior Member
Has anyone tried using the CEC software tables, voltage drop and other electrical calculators at http://www.mc-group.ca ?

Joined: Jan 2003
Posts: 174
B
Member
Thanks Twh and Mike02 for the links.

Joined: May 2003
Posts: 1,157
Member
Thanks for the links also


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