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Eaton B-Line series Type 3/3R junction boxes
Manufacturer Resources
Product Specs
- Certifications:
- UL 50
- Product Height:
- 18 IN
- Product Length Depth:
- 8 IN
- Product Weight:
- 20.7 LB
- Product Width:
- 18 IN
- Department:
- Electrical
B-LINE 18188 RTHC NK – Frequently Asked Questions
1) What size is the B-Line 18188 RTHC NK junction box?
The Eaton B-Line 18188 RTHC NK measures 18 inches high by 18 inches wide with an 8 inch depth, so plan on an 18 x 18 inch wall footprint and roughly 8 inches of standoff from the mounting surface. That depth matters when you are stacking conduit bodies or gutter behind a panel run, and the square 18 x 18 face lines up with common 18 inch wireway and pull box layouts.
2) Can the 18188 RTHC NK junction box be used outdoors or in a wet location?
It is a Type 3/3R enclosure, which is the rating used for outdoor service: protection against windblown dust, rain, sleet and external ice formation. That covers exterior walls, rooftop equipment and unheated service areas. It is not a washdown or submersion rating, so for hose-directed water or oil you want a Type 4 or 4X box instead.
3) Does the B-Line 18188 RTHC NK come with knockouts?
No. The NK in the catalog number means no knockouts, so the box ships with blank walls and you drill or punch your own conduit entries where the run actually lands. That is the usual choice on a field-fitted pull box, but if you want factory entries preset you need the knockout version rather than this one.
4) How heavy is the 18188 RTHC NK box, and does one person need help mounting it?
It weighs 20.7 lb empty. One electrician can hang it, but with an 18 x 18 inch face you will want the mounting holes marked and anchors set before lifting, or a second set of hands to hold it flat while you start the fasteners. Add conductor and device weight on top of that figure when you are sizing anchors into block or drywall backing.
5) What is the RTHC in the B-Line 18188 RTHC NK model number?
RTHC identifies the cover and construction style within Eaton's B-Line screw-cover junction box line, and it is part of the exact catalog number you order by: 18188 RTHC NK. When you are matching an existing box on a site, quote the full string rather than just the 18188 size prefix, since the same 18 x 18 x 8 body is built in several cover and knockout variations.
How fast can I get the B-LINE 18188 RTHC NK delivered?
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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 RTHC NK come with a warranty?
Absolutely. The B-LINE 18188 RTHC NK is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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