Bulletin 1500
NEMA/EEMAC Type 3R Weatherproof
Enclosure
Product Data
Description
NEMA/EEMAC Type 3R enclosures are intended for outdoor use, to provide
protection against falling rain and the formation of ice on the enclosure.
NEMA/EEMAC Type 3R enclosures are designed to meet rod entry, rain,
external icing and corrosion design tests. They are not intended to provide
protection against conditions such as dust, internal condensation, or internal
icing. These enclosures do have provisions for drainage and also have drip
shields, where required, to prevent the entrance of water.
NEMA/EEMAC Type 3R enclosures installed in environments of extreme
temperatures and high humidity may require additional care. In cases of
extreme heat or direct sunlight, a sunscreen or roof may have to be placed over
the enclosure to maimtain the necessary equivalent ambient air temperature of
40° C or less.
Abridged description of NEMA/EEMAC enclosure test requirement per
standards Publication No. 250:
6.2
Rod Entry Test - A 1/8" diameter rod must not be able to enter the
enclosure except at locations where the nearest live part is more than 4"
from an opening - such opening shall not permit a ½" diameter rod to
enter.
6.4
Rain Test - Entire top and all exposed sides are sprayed with water at a
pressure of 5 psi, from nozzles, for one hour, at a rate to cause water to
rise 18 inches in a straight-sided pan beneath the enclosure.
Evaluation 6.4.2.1: No water shall have reached live parts, insulation
or mechanisms.
6.6
External Icing Test - Water is sprayed on enclosure for one hour in a
cold room (2°C). Room temperature is lowered to approximately -5°C.
Water spray is controlled so as to cause ice to build up at a rate of ¼"
per hour until ¾ " thick ice has formed on the top surface of a 1" diameter
metal test bar. Temperature is maintained at -5°C for 3 hours.
Evaluation 6.6.2.2: Equipment shall be undamaged after ice has melted
(external mechanisms not required to be operable while ice-laden).
Product Data • Bulletin 1500
NEMA/EEMAC Type 3R Weatherproof Enclosure
Description (cont.)
6.9
Paint Specification
A general purpose, cool grey polyester, powder coating for metal applications,
offering excellent ultra-violet resistance, mechanical properties and corrosion
resistance.
Gasket Specification
A closed cell, neoprene gasket suitable for outdoor use to enhance the
performance of the enclosure.
Sealant Specification
A premium quality 100% silicone providing a permanently flexible outdoor
seal.
Corrosion Protection - Sheet steel enclosures are evaluated per UL 50
(1992), Section 15 (test for equivalent protection as G-90 commercial
zinc coated sheet steel). Other materials per UL 508, 6.9 or 6.10.
Typical Layout Arrangement
Drip Hood
f
Inner Doors
f
Floor Channel
Front View
Right Side
Bulletin 1512, 400A, One High Controller
Allen-Bradley, a Rockwell Automation Business, has been helping its customers improve
productivity and quality for more than 90 years. We design, manufacture and support a broad
range of automation products worldwide. They include logic processors, power and motion
control devices, man-machine interfaces, sensors and a varity of software. Rockwell is one of
the world’s leading technologycompanies.
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Allen-Bradley Headquarters, 1201 South Second Street, Milwaukee, WI 53204 USA, Tel: (1) 414 382-2000 Fax: (1) 414 382-4444
© 1993 Allen-Bradley Company Printed in Canada
Publication 1500-2.15 - April, 1994