Specifications

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NEMA Enclosure Type Descriptions
• NEMA Type 1 - Type 1 units and sections are intended for indoor use, primarily to provide a degree of protection
against contact with the enclosed equipment in locations where unusual service conditions do not exist. The
enclosures are designed to meet the rod entry and rust resistance design tests. The enclosure is sheet steel, treated
to resist corrosion.
• NEMA Type 1 with gasketed doors (sometimes referred to as 1G) - Type 1 with gasketed unit doors are completely
gasketed around the perimeter of the unit doors. All gasketing is closed cell neoprene.
• NEMA Type 12
(1)
- Type 12 enclosures are intended for indoor use, primarily to provide a degree of protection
against dust, falling dirt and non-corrosive dripping liquids. They are designed to meet drip, dust and rust resistance
tests. They are not intended to provide protection against conditions such as internal condensation.
• NEMA Type 3R - Non-walk-in front mounted only. Door-within-a-door construction. Type 3R units and sections are
intended for outdoor use, primarily to provide a degree of protection against falling rain and to avoid damage from
the formation of ice on the enclosure. They are designed to meet rod entry, rain, external icing and rust resistance
design tests. They are not intended to provide protection against conditions such as dust, internal condensation or
internal icing.
• NEMA Type 4 - Non-walk-in front mounted only. Door-within-a-door construction. Type 4 units and sections are
designed for indoor and outdoor use, primarily to provide protection against windblown dust and rain, splashing
water and hose-directed water. They are also designed to remain undamaged by the formation of ice on the
enclosure. They are designed to meet hosedown, external icing, rod entry and rust-resistance design tests. The
enclosures are not designed to protect against internal condensation or internal icing.
Seismic Applications
CENTERLINE 2100 MCCs meet the requirements for Uniform Building Code (UBC) Zone 4 seismic applications and comply
with IBC 2000 & 2006 seismic criteria.
Actual CENTERLINE 2100 Motor Control Center (MCC) samples have been seismically qualified by dynamic (triaxial
multi-frequency testing) seismic tests per IEEE 344 Seismic Test Standards. The results of this MCC seismic testing
demonstrated compliance with the 100% g level of Uniform Building Code 1997 (UBC) Zone 4 (the maximum UBC Zone)
and 100% g level of the International Building Code 2006 (IBC), that is, the MCC structure, the MCC units, the MCC
components or electrical functions were not compromised when subjected to a UBC Zone 4 earthquake or the IBC seismic
event. Per the IEEE 344 Standard, the equipment was under power and operated before, during and after the seismic tests.
To obtain a UBC or IBC seismic withstandability, each individual CENTERLINE 2100 MCC line-up (for example, both front
and back MCCs in ‘back-to-back’ applications) must be mounted on an adequate seismic foundation and installed per the
seismic anchoring requirements as indicated in publication 2100-IN012, CENTERLINE 2100 Motor Control Centers User
Manual.
Note: Variable frequency drive units utilizing ‘rollout’ drive configurations are not seismically certified.
(1) This publication refers to standard NEMA Type 12 design (that is, standard sheet steel). For stainless steel NEMA Type 12 enclosures, contact your
local Rockwell Automation Sales Office.