Minimum Distribution System Concepts and Applications

Weighted Linear Regression
For Distribution Conductors
m
=
[ N×
∑nXY] − [ ∑nX×
∑nY]
2
[ N×
nX ] − [ nX] 2
∑
SLOPE
∑
N = Total feet of all conductors of a
given type, e.g., 47,557,568 ft of
ACSR conductors
n = Number of feet of a given size
conductor, e.g., 26,194,939 ft of
#2 ACSR
b
y-INTERCEPT
⎡ ⎤
∑nY
⎢∑nX
= − m×
⎥
N ⎢ N ⎥
⎣ ⎦
X = Conductor size in MCM (a #2
wire is 66.36 MCM), e.g., 26.24,
41.74, 52.62, 66.36, etc.
Y = Conductor unit cost in $ per feet,
e.g., $0.659/ft (cost of a #2 ACSR
conductor)
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