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220.55

Merry Christmas

RussB

Member
Location
Albuquerque, NM.
HI,
I'm studding for my masters.
And going through Multifamily Calculations. in one of the questions was about 10x 8k Ranges.
the book says use column b in table 220.55 = 27.20k.
I was thinking I should be using column C @ 25k for minimum.

The way i understood in column A and B were options to Column C. and you should use the lower.
Am i wrong in my thinking?
 

augie47

Moderator
Staff member
Location
Tennessee
Occupation
State Electrical Inspector (Retired)
That is my understanding.
The use of column A&B is optional.
In some cases, such as this, column C gives you a more conservative number.
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
I use to think Col, C was for ranges over 8 3/4kw up to 27 kw using Note 1. It is hard to know what the test is looking for but I would guess if they said 8 kw they want Col. B. Imo those are bad questions.
 

wwhitney

Senior Member
Location
Berkeley, CA
Occupation
Retired
After taking a break, I'm confident note 3 explains it.
thanks for the replies.
Note 3 is optional, it says "it shall be permissible." You can still use Column C if you prefer, which you should, as it gives a smaller answer. If your test says otherwise, it is wrong.

Cheers, Wayne
 
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