Can you use a box extension to add thru feed lugs to a NQ or NF panel?
Issue:
Does Schneider electric recommend using extensions, when adding sub or thru feed lug kits instead of replacing the enclosure with the correct size?
Product Line:
NQ and NF Panelboards
Environment:
Products sold in North America
Resolution:
No, this is not recommended.
Box extensions do not contain box studs so there is nothing to attach the mounting rails that come with the sub/feed thru lug kits.
In the case of the 400A and larger interiors, the longer box also means a longer vented trim. This would move the vents on the trim down an additional 6 inches which allows the thru feed lugs to clear the trim vents. Adding a box extension does not move the trim vents away from the lugs and that results in the lugs being too close to the vents and arcing can occur.
Does Schneider electric recommend using extensions, when adding sub or thru feed lug kits instead of replacing the enclosure with the correct size?
Product Line:
NQ and NF Panelboards
Environment:
Products sold in North America
Resolution:
No, this is not recommended.
Box extensions do not contain box studs so there is nothing to attach the mounting rails that come with the sub/feed thru lug kits.
In the case of the 400A and larger interiors, the longer box also means a longer vented trim. This would move the vents on the trim down an additional 6 inches which allows the thru feed lugs to clear the trim vents. Adding a box extension does not move the trim vents away from the lugs and that results in the lugs being too close to the vents and arcing can occur.
Released for: Schneider Electric USA
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