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Limitations of Hottest-Sport Temperature Rise Over Outside Average Ambient
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|
Part of Metal-Enclosed Bus
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Limit of Hottest Spot Temperature Rise, Degrees C
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Limit of Hottest Spot Total Temperature, Degrees C
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|
Bus conductor (plain connection joints)
|
30
|
70
|
|
Bus conductor (connection joints silver surfaced or equivalent and bolted or welded)
|
50 or 65 unless limited by insulation
|
90 or 105
|
|
Enclosure and support structures where easily accessible
|
40
|
80
|
|
Enclosure and support structures where inaccessible
|
70
|
110
|
|
Insulation
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As limited by material classification
|
N/A
|
|
Terminations-machine, transformer, etc.
|
Same as bus conductor (except as modified by equipment bushing)
|
N/A
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