Specifications

E1
GE Limitamp
®
Medium Voltage Motor Control
Enclosures
E
Enclosures
NEMA Type 1 — General Purpose
The NEMA Type 1 is the standard Limitamp enclosure
designed primarily to prevent accidental contact with control
apparatus. This enclosure is suitable for general purpose indoor
applications with normal atmospheres. For CR194 two-high
design with vented enclosures, add 2 1/2" to the height.
NEMA Type 1A — Gasketed
The NEMA Type 1A rubber-gasketed enclosure is a dust-
resistant enclosure (not dust-tight), designed to give protection
against dust, and when control devices are properly selected, to
give proper operation in a dusty atmosphere. It is recommended
for all moderately dusty atmospheres, especially in those
industries whose dusts are abrasive, conductive, or form high-
resistance contacts. NEMA Type 1A rubber-gasketed enclosures
are not provided with steel bottoms. It is expected that the case
will sit on concrete, effectively sealing the bottom against dust.
NEMA Type 2 — Driptight
This enclosure is made to pr
otect control apparatus against
falling moisture or dirt. All openings are rubber-gasketed
and provided with doors or covers. It is intended for use in
atmospheres where condensation is heavy or where quantities
of water are used in a process or for cleaning. (For applications
where a hose is to be directed on the equipment from any
direction except above, use NEMA Type 4.) Normal instruments,
meters and devices are mounted on the door as in NEMA
Type 1. Strip heaters are used only as the application
requires them.
NEMA Type 3R — Weather-Resistant
These enclosures must be suitable for outdoor installation
and offer protection against driving rain and snow storms,
as well as against dust. Limitamp NEMA 3R enclosures are
provided with solid-steel bottoms and tops, an overhanging
sloping roof and strip heaters, with provisions for future
extension.
The following types of NEMA 3R enclosures are available:
• NEMA Type 3R, weather-resistant, full-height cover door,
non-walk-in (42 inches deep by 101 inches high). (Use
when a number of devices are on the door.)
• NEMA Type 3R, weather-resistant walk-in (92 inches deep
by 111 1/4 inches high).
Walk-in enclosures allow ample space for inspection and
maintenance of starters within the enclosure.
Standard construction is suitable for wind velocities of 130
mph and roof loading up to 30 pounds per square foot.
Exterior finish is applied by an electro-static powder coat
process (polyester based).
NEMA Type 12 — Dusttight
These cases are designed to meet the requirements of
industrial locations wher
e protection is required against
entrance of fibers and flying lint, dust, dirt, light splashings,
seepage dripping and external condensation of non-
corrosive liquids.
Typical requirements for NEMA 12 are:
• A gasketed cover that is hinged to swing horizontally, and
held in place with screws, bolts or other suitable fasteners.
• No open holes through the enclosure. All openings are
sealed with gasketed cover plates.
• No conduit knockouts or knockout openings.
• Steel bottom.
Indoor Enclosure Constr
uction
Limitamp indoor enclosures are manufactured from 12-gauge
steel throughout, except for 13-gauge on the rear covers.
For surface preparation, see the Application Data section.
Choice Of Mounting — Indoor
You may select either back-to-back (60 inches deep) or
back-to-wall (30-inches deep) mounting, letting you arrange
control lineups to your own floor space and application
requirements.rewrite to accommodate 3000A
Back-to-back mounting
Back-to-wall mounting