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Crashed rock or Gravel stone which is better for use in medium/high voltage substation switch-yard?

Power Engineering Power Plants Electric Power High Voltage Electrical Design
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Question added by Md Arif Hossen , Deputy Director (Technical) , Bangladesh Rural Electrification Board (BREB)
Date Posted: 2015/06/11
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ANIS MUJAHID ABDUL AZIZ ANSARI
by ANIS MUJAHID ABDUL AZIZ ANSARI , ELECTRICAL ENGINEER , PIONEER ELECTRICAL ENTERPRISES

Crashed rock is better for use in medium/high voltage Sub Station switch Yard 

for newly installed sub station switch yard first layer of crushed rock of size @2.5-3.0"(inch)

second layer on it1.0-1.5" & over that spread6 mm stone powder 

 

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