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Substation — Welded/EHV
BURNDY
®
Canada: 1-800-387-6487
www.burndy.com
US: 1-800-346-4175
Blue highlighted items are industry standard and most frequently ordered.
M-4
NOMOGRAM FOR
DETERMINING THE
EQUIVALENT
HEIGHT (he) OF A
THREE PHASE LINE
Nomogram for determining the equivalent
height of a single conductor line having the
same average voltage of gradient as the
CENTER conductor of a horizontally spaced
d-Phase To Phase Spacing
h-Three Phase Line Height Above Ground
Example:
For a three phase line height, (h), of 60 ft. and a phase spacing, (d),
of 40 ft., the equivalent height, (he), is 19 ft.
hd
he = ____________
(4h
2
+ d
2
)
three phase line, with the same line to ground
voltage and the same conductor size. All
dimensions measured in the same units.