Sealing locknuts?
- Thread starter veco
- Start date
- Status
drbond24
Senior Member
- Location
- Barboursville, West Virginia
I attempted to attach a document detailing NEMA enclosure types. Compare NEMA 4 to NEMA 12 and see what you think.
drbond24
Senior Member
- Location
- Barboursville, West Virginia
Ok so it didn't work the first time. The file was a little too large so I deleted the NEMA logo out of the document. It should actually be attached this time.
Thanks for the assist, but I'm still confused. UL lists certain sealing locknuts as compliant to 514B (liquid tight) but nowhere can I find "dust tight", which is a defining feature of NEMA12. Common sense says liquid tight implies inclusion of dust tight, but I can't find it in writing. I guess a UL inspector would have to decline approval of a penetration into a NEMA12 enclosure by a conduit that is liquid tight sealed by a sealing locknut, Huh?
I always use the myers hub for this application, http://www.crouse-hinds.com/crousehinds/pdf/CH62318C-0077.pdf
would that count as a sealing locknut.
would that count as a sealing locknut.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
veco said:
Sealing Locknut
Here is what I found. A sealing locknut is a Nema FB-1 standard. You need to figure out what class and division you have because the following red statement will tell you what areas are excluded from this standard.
[FONT=Verdana,Arial]FB 1-2007 covers fittings that are a part of electrical raceway systems and meet requirements of the National Electrical Code? (NEC). These include fittings used with non-flexible tubular raceways, as well as flexible conduit and cable raceways that encompass flexible metal conduits, armored cable, metal-clad cable, tray cable, mineral-insulated cable, flexible cords, nonmetallic sheathed cable, and service entrance cable. It also includes cast metal outlet boxes as well as conduit bodies and covers.[/FONT]
[FONT=Verdana,Arial][FONT=Verdana,Arial]It excludes fittings, boxes, or enclosures that are used in Class I, Division 1; Class II, Division 1; Class III, Division 1; Class I, Zones 0, 1, or 2; and Class II, Zones 20, 21, or 22. There are exceptions for fittings and enclosures that are specifically permitted by NEC.[/FONT][/FONT]
- Status