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Eaton B-Line series Type 3/3R junction boxes
Manufacturer Resources
Product Specs
- Certifications:
- UL 50
- Closure Type:
- Flanged cover
- Country Of Origin:
- United States
- Cover Type:
- Screw
- Finish Color:
- Painted
- Mounting Hole Details:
- Embossed thru holes
- Nema Rating:
- 3R
- Product Height:
- 18 IN
- Product Length Depth:
- 8 IN
- Product Weight:
- 20.5 LB
- Product Width:
- 18 IN
- Special Features:
- Rain hood, plated screws
- Wall Thickness:
- 16 gauge
- Department:
- Electrical
- Product Model:
- RTSC NK enclosure
- Product Color:
- ANSI 61 Grey
- Mounting Method:
- Surface
- Product Style:
- Medium single door
- Product Material:
- Carbon steel
B-LINE 18188 RTSC NK – Frequently Asked Questions
1) Can the B-Line 18188 RTSC NK junction box be mounted outdoors?
Yes. The Eaton B-Line 18188 RTSC NK is a NEMA 3R enclosure, so it is built for outdoor use where falling rain, sleet and external ice formation are the concern. It also carries a rain hood over the cover. NEMA 3R does not cover hosedown or windblown dust, so for a washdown area or a dusty industrial bay you want a Type 4 or 12 box instead.
2) What size is the 18188 RTSC NK enclosure box?
It measures 18 inches high by 18 inches wide with an 8 inch depth, and weighs 20.5 lb. That square 18 x 18 footprint with the 8 inch back depth gives room for pull and splice work or a small panel of terminal blocks; check your bend radius requirements before committing conduit to the 8 inch dimension.
3) Does the B-Line 18188 RTSC NK come with knockouts already punched?
No. The NK in the model designation means no knockouts, so the body arrives blank and you locate and punch your own conduit entries. That is the usual choice when you want entries only on the bottom or on a specific side to keep the 3R rating intact. If you want factory knockouts, order the knockout version of the same box instead.
4) How do you mount the 18188 RTSC NK to a wall or strut?
It is a surface mount enclosure with embossed through holes in the back. The embossing stands the box off the mounting surface so water cannot sit behind it and the holes stay sealed to the interior. Mounting hardware is not part of the enclosure, so pick your own anchors or strut fasteners for a 20.5 lb box plus the weight of what goes inside.
5) Is this Eaton B-Line junction box UL listed for a spec job?
The 18188 RTSC NK is built to UL 50, the standard covering enclosures for electrical equipment, and it is made in the US. For a submittal calling out a UL 50 rated Type 3R surface enclosure in painted steel, this one answers the spec.
6) How does the cover attach on this Eaton B-Line 3R junction box?
It is a flanged cover held by screws, and the screws are plated to resist corrosion outdoors. A flanged screw cover is removed fully rather than hinged, so allow clear space in front of the box for a two-hand lift of the panel when you are terminating.
7) What is the 18188 RTSC NK box made of and will it match the other gear on site?
The shell is 16 gauge carbon steel, painted ANSI 61 grey, which is the standard grey used across most industrial panelboards and control gear, so it blends with existing equipment on an industrial wall. Steel painted for outdoor duty is fine for most exterior work but not for coastal salt spray or chemical exposure, where stainless or non-metallic is the better call.
8) Is a screw cover box like this the right choice, or should I use a hinged door enclosure?
A flanged screw cover box like the 18188 RTSC NK suits pull boxes, splice points and terminations you open rarely. If the box houses a disconnect, controls or anything a tech opens routinely, a hinged door enclosure is easier to live with because the cover stays with the box. Note this one is catalogued as a medium single door style, so the whole 18 by 18 face comes off when you unscrew it.
How fast can I get the B-LINE 18188 RTSC NK delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the B-LINE 18188 RTSC NK come with a warranty?
Absolutely. The B-LINE 18188 RTSC NK is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the B-LINE 18188 RTSC NK?
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