405.3(A) or 450.3 (b) which to use?

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pittinvt

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Hello again,
I have a xfmer that goes from 480 (pri) to 12470 (sec). Table 450.3 (A) is for xfmers 600 volts and above. Table 450.3(B) is for xfmers below 600 volts. Which table do I use to determine if I need OCP or not for this xfmer?
Here is the situation: I have a wind turbine feeding a 480 to 12470 xfmer. From this xfmer I have 15kV cables going to a 12470 to 208 xfmer. I am trying to determine if I need OCP in between the xfmers.
I think that we do need OCP in between the xfmers as I interpret the NEC. Others think that we don't need OCP in between the xfmers.
All xfmers are outside in supervised locations.
Any help would be, as always, greatly appreicated.
 
pittinvt said:
Hello again,
I have a xfmer that goes from 480 (pri) to 12470 (sec). Table 450.3 (A) is for xfmers 600 volts and above. Table 450.3(B) is for xfmers below 600 volts. Which table do I use to determine if I need OCP or not for this xfmer?
Here is the situation: I have a wind turbine feeding a 480 to 12470 xfmer. From this xfmer I have 15kV cables going to a 12470 to 208 xfmer. I am trying to determine if I need OCP in between the xfmers.
I think that we do need OCP in between the xfmers as I interpret the NEC. Others think that we don't need OCP in between the xfmers.
All xfmers are outside in supervised locations.
Any help would be, as always, greatly appreicated.
Click to expand...




I hope this isn't stepping on anybody's toes here, but the below link would be a very good place to post this question.


http://www.wind-sun.com/ForumVB/index.php?



Plaese forgive me if I just broke some "forum code" :)
 
What is the rating of the Wind Turbine and its own service disconnects? That should define what the "downstream" devices and their protection should be.
 
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