Above 600v underground

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Tuffy99

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I am looking for the code reference which requires an underground installation greater than 4kv to be encased in concrete. I thought this was in the code a few cycles back but I can not find in 08

Thanks for the help
 
Tuffy99 said:
I am looking for the code reference which requires an underground installation greater than 4kv to be encased in concrete. I thought this was in the code a few cycles back but I can not find in 08

Thanks for the help
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Look at table 300.50 it is 30 " for direct buried cables
 
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