Hi,
I need clarification on Table 300-5.
The situation is this; My mother owns a jewelry company in Northern California. A couple of weeks ago a contractor working on another part of the building cut through a concrete slab that was approximately 4? thick. Beneath the concrete were four PVC conduits that fed various sub panels in the building, one of which was one of my mothers. The area where the PVC was cut is in a warehouse (kind of a garage type setting that vehicles can be driven into) where forklifts have been used.
The power surge from this damage to various machines at her company, including a 300 ton press. We are trying to determine responsibility.
The contractor feels that the owners of the building are responsible for the damage because the conduit feeding her sub panel was only a couple of inches below the concrete slab (for a total of about 6? below the surface). Because it is a warehouse, he feels that the listing ?Under streets, highways, roads, alleys, driveways, and parking lots? in table 300-5 should be used.
The electrician for the building owner feels that the conduit was fine where it was because of his interpretation of table 300-5. He feels that the listing ?Under a building? should be used.
The question is this; how should this area be classified and what is the actual depth that the pipes should have been?
In table 300-5, under the column heading ?Location of Wiring Method or Circuit?, would this area be considered ?Under a building?, ?Under minimum of 4-in. thick concrete exterior slab with no vehicular traffic and the slab extending not less than 6 in. beyond the underground installation?, or ?Under streets, highways, roads, alleys, driveways, and parking lots?. I am assuming that Column 3 ?Nonmetallic Raceways Listed for Direct Burial Without Concrete Encasement or Other Approved Raceways? is also used.
I see merits to both arguments. What is correct?
I need clarification on Table 300-5.
The situation is this; My mother owns a jewelry company in Northern California. A couple of weeks ago a contractor working on another part of the building cut through a concrete slab that was approximately 4? thick. Beneath the concrete were four PVC conduits that fed various sub panels in the building, one of which was one of my mothers. The area where the PVC was cut is in a warehouse (kind of a garage type setting that vehicles can be driven into) where forklifts have been used.
The power surge from this damage to various machines at her company, including a 300 ton press. We are trying to determine responsibility.
The contractor feels that the owners of the building are responsible for the damage because the conduit feeding her sub panel was only a couple of inches below the concrete slab (for a total of about 6? below the surface). Because it is a warehouse, he feels that the listing ?Under streets, highways, roads, alleys, driveways, and parking lots? in table 300-5 should be used.
The electrician for the building owner feels that the conduit was fine where it was because of his interpretation of table 300-5. He feels that the listing ?Under a building? should be used.
The question is this; how should this area be classified and what is the actual depth that the pipes should have been?
In table 300-5, under the column heading ?Location of Wiring Method or Circuit?, would this area be considered ?Under a building?, ?Under minimum of 4-in. thick concrete exterior slab with no vehicular traffic and the slab extending not less than 6 in. beyond the underground installation?, or ?Under streets, highways, roads, alleys, driveways, and parking lots?. I am assuming that Column 3 ?Nonmetallic Raceways Listed for Direct Burial Without Concrete Encasement or Other Approved Raceways? is also used.
I see merits to both arguments. What is correct?
