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PowerGuard® AL 35kV 100% TR-XLPE CN XLPE UL Type MV-105 Electrical Properties (FLAT TOUCHING)


NOTES

Conductor ampacities are based on the following:

• Load factor of 100% or 75%
• Earth thermal resistivity of 0.900ºC-m/W
• Ambient earth temperature of 20ºC
• Maximum conductor operating temperature of 105ºC
• Concentric neutral wires grounded at both ends (shield circulating currents flowing)
• Minimum separation of 3 m or 9.8 ft from any other underground electrical system or heat source
• Maximum load variation between phases of 10%
• Maximum 910 mm or 36 in depth of burial
• Cable arrangements:
○ Trefoil and touching
○ Flat and touching
○ Flat and spaced 190 mm or 7.5 in, center-to-center
• The ampacity values calculated may be limited by the maximum earth interface temperature due to soil moisture migration or dry out, and has not been considered here.


Updated 3/16/2022
Unit of Measure

Conductor
Size
AWG
or
kcmil

 N/A 250

Neutral
Wires

 N/A 19

Neutral
Size
AWG

 N/A 14

Neutral
Size

 N/A 2/3

Sequence
Impedance
Pos/Neg
(µΩ/feet)

 N/A 101.5 + j46.15

Seq
Impedance
Zero
(µΩ/feet)

 N/A 260.18 + j66.16

Ampacity
LF=100%
(A)

 N/A 337

Ampacity
LF=75%
(A)

 N/A 390