Cut Sheet

Volume 1—Residential and Light Commercial CA08100002E—August 2015 www.eaton.com V1-T1-71
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1.2
Loadcenters and Circuit Breakers
Type BR Loadcenters and Circuit Breakers
Technical Data and Specifications
General
A. The Contractor shall
furnish and install
deadfront loadcenters
incorporating circuit
breakers of the number,
rating and type as
specified herein and
as shown on the
contract drawings.
B. The loadcenter and all
components shall be
designed, manufactured
and tested in accordance
with the latest applicable
standards of UL, NEMA
and NEC including:
1. UL 67—Standards
for Panelboards.
C. UL 50—Standards for
Cabinets and Boxes.
D. UL 489—Standards for
Molded Case Circuit
Breakers.
E. UL 869—Standards for
Service Equipment.
F. Federal Specification
W-C 375B—Circuit
Breakers.
G. Federal Specification
W-C P115b—Panel
Power Distribution
Type 1, Class 2.
Qualifications
A. The manufacturer of the
loadcenter shall be the
manufacturer of the
circuit breaker within
the loadcenter.
B. For the equipment
specified herein, the
manufacturer shall be
ISO 9000 certified.
C. The manufacturer of
this equipment shall have
produced similar
electrical equipment
for a minimum period
of seven (7) years.
Manufacturers
A. Eaton.
Ratings
A. Loadcenters shall be
rated for 120/240 Vac and
shall have short-circuit
ratings as shown on the
drawings or
as herein scheduled,
but not less than
10,000 amperes rms
symmetrical.
B. Circuit breakers shall be a
minimum of 125 A
frame. Circuit breakers
15 through 125 A trip size
shall take up the same
pole spacing.
C. Loadcenters shall be
labeled with a UL short-
circuit rating. When
series combination
ratings are applied
with integral or remote
upstream devices, a label
shall be provided. Series
combination ratings shall
cover all trip ratings of
installed frames. It shall
state the conditions of
the UL series ratings
including:
1. Size and type of
upstream device.
2. Branch devices that can
be used.
3. UL series short
circuit rating.
Construction
A. All interiors, with the
exception of the branch
circuit breakers, shall
be completely factory
assembled with main
breakers, main lugs,
or no main device.
B. Interiors shall be
designed so that circuit
breakers can be replaced
without disturbing
adjacent units and
without removing the
main bus connectors and
shall be designed so that
circuits may be changed
without machining,
drilling, or tapping.
C. Physical means shall be
provided to prevent the
i
nstallation of more
overcurrent devices than
that number for which
the enclosure was
designed, rated and
approved. Half-size
breakers shall have a
UL listed rejection tab
over the line terminals.
Loadcenter interiors
must have notched stabs
to accept these rejection
tab class CTL breakers, if
required and approved.
Bus
A. Busbars for the main and
cross connectors shall be
[tin-plated aluminum]
[copper] in accordance
with Underwriters
Laboratories standards.
Busing shall be braced
throughout to conform to
industry standard practice
governing short-circuit
stresses in loadcenters.
Note: Note to spec writer—
select one (copper available
in limited ratings).
B. Neutral busing shall
have a suitable lug for
each outgoing feeder
requiring a neutral
connection of same
ampacity as branch.
Wiring/Termination
A. All wire connectors and
terminals shall be of the
anti-turn solderless type
and shall be suitable for
copper or aluminum wire
of the sizes indicated. All
connectors must meet
the “Requirements for
Wire Connectors and
Soldering Lugs” as
stated in UL 486B.
B. All loadcenters where
marked shall be suitable
for use with 60 °C or
75 °C rated wire.
Circuit Breakers
A. Circuit breakers shall
be molded case type.
Circuit breakers shall
have four-rivet
construction (GFI Type—
5 rivets). Multipole circuit
breakers shall be of a
stack pole design to
provide electrical
phase isolation.
B. Each pole of the
circuit breaker will
provide inverse time
delay overload and
instantaneous short-
circuit protection by
means of both thermal
and magnetic sensors.
C. The circuit breaker
calibration shall
not be affected by
environmental changes
in relative humidity.
The thermal bimetal
element shall be welded
to the steel frame and
calibration shall be set
independent of the
molded case by computer
controlled equipment.
D. All circuit breakers
shall be operated by
a toggle-type handle
and multipole circuit
breakers shall have an
internal common trip
mechanism. The
circuit breakers shall
incorporate trip
mechanisms that are
mechanically trip-free
from the handle. The
handle position shall
provide visual trip
indication.
E. Contacts shall be of
non-welding silver alloy.
F. All circuit breakers shall
have the trip rating
inscribed on the handle
on each circuit breaker
pole. Also, unique color-
coded cases that indicate
the UL listed 10 kA or
22 kA interrupting
ratings. Breakers shall
be able to be used
as main or branch
disconnect devices.