timm333
Senior Member
- Location
- Minneapolis, MN
- Occupation
- Electrical Design Engineer
We have to lay direct buried cables on 480V secondary side of transformer. The cables are multiconductor, with five conductors per phase in parallel. NEC 300.5 states that the minimum cover for direct-buried shall be 24”, but it does not tell about spacing between direct-buried cables.
When cables are run in underground PVC conduits: the PVC conduits can be laid in screened-sand in two vertical layers, and the minimum required spacing between adjacent PVC conduits (both horizontal and vertical) is 7.5”.
When we lay cables as direct-buried, can we still lay cables in two vertical layers? Also when we lay cables as direct buried, what would be the minimum required spacing between adjacent cables? Thanks
When cables are run in underground PVC conduits: the PVC conduits can be laid in screened-sand in two vertical layers, and the minimum required spacing between adjacent PVC conduits (both horizontal and vertical) is 7.5”.
When we lay cables as direct-buried, can we still lay cables in two vertical layers? Also when we lay cables as direct buried, what would be the minimum required spacing between adjacent cables? Thanks
