Engineers always detail duct bank with encased concrete. What should I detail instead?

L

LifeLongLearner

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Location
Rhode Island
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Engineer
The firms I've been at always detail a duct bank with encased concrete for the service no matter the situation. The system I'm working on is 480V and has a 600A secondary service for an office building, and a 600A service for a PV system over the parking lot. I'm thinking of detailing (2) 3" Sch. 40 PVC to be buried with back fill (no concrete). Depths will be detailed per Table 300.5(A). The runs are ~100'. When would fiberglass conduit come into play?
 
Are you installing service raceway per poco specs and do they allow FG?
I often see one sack concrete dyed red.FG is great for pulling but is much slower to install.
PVC with is fine but spec use mule tape for pulling conductors
 
tom baker said:
Are you installing service raceway per poco specs and do they allow FG?
I often see one sack concrete dyed red.FG is great for pulling but is much slower to install.
PVC with is fine but spec use mule tape for pulling conductors
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Good point. I don't see fiberglass mentioned in their specs. They only mention PVC.
 
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