Can a cable be protected by a breaker that is located two levels upstream.
For instance lest say that in panel A there is a 600A breaker that feeds (2) sets of 350MCM cables which terminate in panel B. From panel B there is than an 800A breaker which feeds (2) sets of 350MCM cables which feed a panel C.
No I know that the (2) sets of 350MCM cables between panels B and C are not adequately protected by the 800A breaker in panel B. But can these cables be considered adequately protected by the 600A breaker two levels upstream of the cables in panel A?
Or does 240.21 imply that the conducotrs should be protected at the point in which they recieve their supply which would not allow the upstream 600A breaker to provide protection?
For instance lest say that in panel A there is a 600A breaker that feeds (2) sets of 350MCM cables which terminate in panel B. From panel B there is than an 800A breaker which feeds (2) sets of 350MCM cables which feed a panel C.
No I know that the (2) sets of 350MCM cables between panels B and C are not adequately protected by the 800A breaker in panel B. But can these cables be considered adequately protected by the 600A breaker two levels upstream of the cables in panel A?
Or does 240.21 imply that the conducotrs should be protected at the point in which they recieve their supply which would not allow the upstream 600A breaker to provide protection?