3
Instruction Booklet
IB48088
Effective July 2021
Instructions for Eaton’s 7.2 kV Ampgard AR
(arc resistant motor control center)
(Compliant to IEEE C37.20.7-2017)
EATON
www.eaton.com
Figure 1. Typical locations of the rating nameplates.
1.4 Ratings
Ampgard AR meets the requirements of UL 347 as applied to metal enclosed medium voltage industrial equipment.
and
show the ratings of Ampgard AR.
Table 1. Electrical ratings.
Rated
maximum
voltage
Ratings per UL 347
Starters per
structure
Starter frame
size
Maximum
current per
starter
Insulation level
Rated main
bus continuous
current
Rated short-circuit
current withstand (2
second)
Dielectric
withstand
Impulse
kV rms
#
Amperes
Amperes
kV rms
kV peak
Amperes
kA rms sym.
7.2
1
400
400
18.2
60
1000
1200
2000
3000
50
2
400
360 (top & bottom)
1
800
720
Table 2. Arc resistant ratings.
Ratings per IEEE C37.20.7-2017
Plenum and duct style
Accessibility type*
Rated arc short-circuit withstand
Rated arc duration
kA rms sym.
sec.
2B
50
0.5
Common with VacClad/W
Table notes:
* Accessibility type.
Type 2 - Switchgear with arc resistant designs or features at the freely accessible exterior (front, back, and sides) of the equipment only.
Suffix B is used to identify that the equipment meets the requirements that design with the indicated control compartment door or cover open.
Rating
nameplate
Arc rating
nameplate