Are welded base channels for panelboards only available in Nema 3R/12 applications?
UL 67; UL 50; CSA C22.2 No.'s 20-M1989 & 94-M91, 29 & 94-1989; NEMA PB1; NFPA 70 Art. 408; Federal Specification W-P-115C Type 1 Class 1 ; 2003 IBC; NFPA 5000; ASCE/SE17;2000 IBC, 1995 NBCC
Welded base channels allow the normally wall-mounted enclosure to be free-standing.
No, welded base channels are available for NF and NQ panelboards with a Nema 1 rated enclosure as well on NEMA 3R/12 enclosures. For I-Line and QMB panelboards, however, welded base channels are available only for NEMA 1 enclosures. We are no longer offering welded base channels (which provide for a freestanding enclosure) for NEMA 3R/12 I-Line and QMB panelboard enclosures.