Bus duct VD calculation

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M

mcelweec@gmail.com

CMAC1
Location
NYC
Occupation
Electrician
I'm calculating VD on a bus duct.
The run is 400ft,
At 275ft there is a meter bank another one at 350ft and lastly one at 400ft.
With the various online calculators there are 2 options , distributed load & concentrated load.
I'm thinking that I should be working of distributed load whereas others think I should be using concentrated load to the 1st set of meter banks & segmented loads after that.
This makes a big difference as VD is halved if I can use the distributed load.
Which table should I use?
 
to get the most accurate voltage drop, use the concentrated load and figure each section of bus duct individually, and add the results.
 
mcelweec

"With the various online calculators there are 2 options , distributed load & concentrated load."

Would you please post some "LINKS" or name the sites for a few of these calculators.
 
MyCleveland said:
Ingenieur

Have you used this program ?

If you understand the inputs.....can you explain difference between cell B1 & B13 ?
Click to expand...

'actual' B1 is your connected load
'upsize' B13 (B10?) is if you want future expansion
say your load is currently 1000 (actual), and it will be 1250 (upsize) in 2 years after expansion
if no expansion or increase in load is planned actual = upsize

play with it
change inputs and see how it changes the results
 
Last edited:
Ingenieur

Thanks again
I am tinkering...here is a rub. If B13 is not a table value (Standard Size), then everything collapses.

I will start with retagging a few things and adding some conditional drop downs.

May I reach out again later ?
 
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