B-Line Eaton series Type 3/3R ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,691.61
B-Line Eaton series Type 3/3R junction boxes, 18" height, 8" length, 18" width, 3R, Hinged cover, RTHC enclosure, Surface mounted, Medium single door

B-Line Eaton series Type 3/3R junction boxes, 18" height, 8" length, 18" width, 3R, Hinged cover, RTHC enclosure, Surface mounted, Medium single door

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Model: 18188 RTHC
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,691.61
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Eaton B-Line series Type 3/3R junction boxes, 18" height, 8" length, 18" width, NEMA 3R, Hinged cover, RTHC enclosure, Surface mounted, Medium single door, 9 knockouts, Embossed thru holes, Carbon steel

Manufacturer Resources

Product Specs

Certifications:
UL 50
Closure Type:
Formed top hinge
Country Of Origin:
United States
Cover Type:
Hinged
Finish Color:
Painted
Locking Provisions:
Padlock provision
Mounting Hole Details:
Embossed thru holes
Mounting Method:
Surface
Nema Rating:
3R
Product Height:
18 in
Product Length Depth:
8 in
Product Weight:
20.7 lb
Product Width:
18 in
Special Features:
Rain hood, removable cover
Wall Thickness:
16 gauge
Department:
Electrical
Product Model:
RTHC enclosure
Product Color:
ANSI 61 Grey
Product Style:
Medium single door
Product Material:
Carbon steel

B-LINE 18188 RTHC – Frequently Asked Questions

1) Can the B-Line 18188 RTHC enclosure be mounted outdoors?
Yes. The 18188 RTHC carries a NEMA 3R rating and includes a rain hood, so it is built for outdoor wall mounting where falling rain, sleet and ice are the concern. It is not a washdown or hosedown box, 3R does not cover direct water jets or dust-tight service. Body is 16 gauge carbon steel, painted ANSI 61 grey.
2) What are the actual box dimensions on the B-Line 18188 RTHC junction box?
18 inches high, 18 inches wide and 8 inches deep. That 8 inch depth is what decides whether your gutter taps, terminal blocks or a small contactor will sit inside with the hinged door still closing. It weighs 20.7 lb empty, so a single installer can hang it, but anchor into studs or masonry, not drywall alone.
3) Does this Eaton B-Line 3R enclosure come with knockouts already, or do I have to punch my own?
The 18188 RTHC ships with 9 knockouts, so standard conduit entries are already provided. For a 3R installation keep your entries on the bottom or lower sides and use rain-tight fittings on anything on the top or upper surfaces, otherwise the 3R rating is defeated at the penetration.
4) How does the 18188 RTHC mount to a wall, and is mounting hardware built in?
Surface mount, using embossed thru holes in the back of the enclosure. Embossed holes keep the mounting fasteners standing the box slightly off the wall surface. You supply the anchors or lags to suit the wall, and be aware the holes are inside the enclosure, so the box must be open to fasten it.
5) Can this B-Line junction box be padlocked for a tenant or public area?
Yes, the 18188 RTHC has a padlock provision on the door, which is what property managers and facility crews usually need for boxes in corridors, rooftops, loading docks or anywhere unqualified people can reach. Padlock is not supplied.
6) Is the door on the RTHC hinged or a screw cover, and can it be taken off?
Both, in effect. It is a medium single door with a formed top hinge, so it swings open and stays with the box during service, and the cover is removable if you want it off entirely while pulling wire or landing a large bundle. Screw covers on a box this size are a two-hand job on a ladder, the hinge is the reason to pick this one.
7) Is the B-Line 18188 RTHC UL listed, and will it pass an inspection on a spec job?
It is built to UL 50, the standard covering enclosures for electrical equipment, and it is manufactured in the US. Between the UL 50 reference and the NEMA 3R rating it covers the usual submittal line for an outdoor surface junction or pull box. Confirm your drawing does not call for a 4 or 4X rating instead, as 3R will not satisfy those.
8) Will a painted steel 3R box hold up outdoors, or should I be specifying stainless?
The 18188 RTHC is 16 gauge carbon steel with a painted ANSI 61 grey finish, which is the standard choice for normal outdoor and industrial exposure. In coastal salt air, chemical exposure, or a washdown area, painted carbon steel is the wrong call and you want a stainless or non-metallic 4X enclosure instead.
9) Is the part number for the 18x18x8 B-Line hinged 3R box just 18188 RTHC?
Yes. The Eaton B-Line catalogue number is 18188 RTHC, where the digits read as 18 high, 18 wide, 8 deep and RTHC identifies the rain-tight hinged cover enclosure. Quote that number straight, there is no separate finish or size suffix to add.
How fast can I get the B-LINE 18188 RTHC delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
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 come with a warranty?
Absolutely. The B-LINE 18188 RTHC 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 RTHC?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the B-LINE 18188 RTHC from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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