JONES AIRWAYS LLC
CLEVELAND REGIONAL AIRPORT
MAA-12-11
ROBERDS P.E. 2012-224
16475-1
OVERCURRENT PROTECTION
SECTION 16475
OVERCURRENT PROTECTION
PART 1 - GENERAL
1.01
Summary:
A. Provide fuses and circuit breakers of ampere rating and U.L. Classification as
indicated on the drawings.
B. Related Sections:
1. Section 16050:
2. Section 16430:
3. Section 16440:
4. Section 16170:
5. Section 16470:
1.02
Electrical General
Main Distribution Panel
Disconnect Switches
Motors and Equipment Connections
Panelboards
Submittals:
A. Product Data
1. Manufacturers: Product Data Sheets
2. Time - Current Characteristic Curves (Average Melt)
3. Current Limitation Curves
PART 2 - PRODUCTS
2.01
Manufacturers:
A. Acceptable Manufacturers - Fuses:
1. Products specified as standard of quality are manufactured by Cooper Industries,
Bussmann Division, referred to as Bussmann.
2. Products of manufacturers listed below meeting indicated standards and specified
manufacturer's product data characteristics, except as modified below, are acceptable
for use, subject to prior approval of proposed product list.
a. Gould Shawmut
3. All fuses shall be of the same manufacturer.
B. Acceptable Manufacturers - Circuit Breakers
1. Products specified as standard of quality are manufactured by Square D Company,
referred to as Square D.
2. Products of manufacturers listed below meeting indicated standards and specified
manufacturer's product data characteristics, except as modified below, are acceptable
for use, subject to prior approval of proposed product list.
a. General Electric
b. Siemens/ITE
c. Westinghouse
3. Circuit breakers shall be of the same manufacturer as the panelboard or enclosure in
which they are installed.
JONES AIRWAYS LLC
CLEVELAND REGIONAL AIRPORT
MAA-12-11
ROBERDS P.E. 2012-224
2.02
16475-2
OVERCURRENT PROTECTION
Fuses:
A. Mains, Feeders and Branch Circuits:
1. Circuits 601 to 6000 amperes shall be protected by current limiting BUSSMANN
LOW-PEAK time-delay fuses KRP-C(amp)SP. Fuses shall employ "0" rings as
positive seals between the end bells and the glass melamine fuse barrel. Fuse
links shall be pure silver (99.9% pure) to limit the short circuit current let-through
values to low levels and comply with NEC Sections requiring component
protection. The terminals shall be peened. Fuses shall be time-delay and shall
hold 500% of rated current for a minimum of 4 seconds, clear 20 times rated current
in .01 seconds or less and be listed by Underwriters Laboratories Inc. with an
interrupting rating of 300,000 amperes RMS symmetrical. The fuses shall be UL
Class L. Fuses shall be "LOW-PEAK YELLOW" in color.
2. Circuits 0 to 600 amperes shall be protected by current limiting BUSSMANN
LOW-PEAK dual-element fuses LPN-RK, LPS-RK, or LPJ. All dual-element fuses
shall have separate overload and short-circuit elements. Fuses shall incorporate a
spring activated thermal overload element having a 284 degree Fahrenheit melting
point alloy and shall be independent of the short-circuit clearing chamber. The
fuse shall hold 500% of rated current for a minimum of 10 seconds (30A, 250V Class
RK1 case size shall be a minimum of 8 seconds at 500% of rated current) and be
listed by Underwriters Laboratories, Inc with an interrupting rating of 300,000
amperes RMS symmetrical. The fuses shall be Time-Delay UL Class RK1 or J to
maintain the engineered protection of the system components. Fuses shall be
"LOW-PEAK YELLOW" in color.
B. Spares:
1. Upon completion of the building, the electrical contractor shall provide the Owner
with spare fuses as shown below:
a. 10% (minimum of 3) of each type and rating installed fuses shall be supplied
as spares.
2. BUSSMANN spare fuse cabinet - Catalog No. SFC shall be provided to store
the above spares. The spare fuse cabinet (SFC) shall include a supply of
"LOW-PEAK YELLOW" NOTICE labels.
2.03
Molded Case Circuit Breakers:
A. Description:
1. Circuit breakers shall be Square D FA, KA, LA, NH, PA and/or PC one, two or
three pole molded case circuit breakers rated 15 through 3000 amperes, 120V.ac,
240V.ac, 277V.ac, 480V.ac, as specified on the drawings. Breakers shall have an
interrupting rating to match the panel in which they are installed or as indicated on
the drawings. All circuit breakers shall be UL and CSA listed, IEC 157-1 rated,
meet NEMA Standard AB1-1975 and Federal Specification W-C-375B/GEN, when
applicable. Breakers covered under this specification may be installed in
panelboards, switchboards, individual enclosures, motor control centers,
combination motor starters or 1-LINE busway plug-in units.
B. Construction:
1. Molded case circuit breakers shall have overcenter toggle-type mechanisms,
providing quick-make, quick-break action. Breakers shall be calibrated for
operation in an ambient temperature of 40 degrees C. Each circuit breaker shall
JONES AIRWAYS LLC
CLEVELAND REGIONAL AIRPORT
MAA-12-11
ROBERDS P.E. 2012-224
16475-3
OVERCURRENT PROTECTION
have trip indication by handle position and shall be trip-free. Two and three pole
breakers shall be common trip. Each circuit breaker shall have a permanent trip
unit containing individual thermal and magnetic trip elements in each pole.
Circuit breakers with frame sizes greater than 100 amperes shall have variable
magnetic trip elements which are set by a single adjustment (to assure uniform
tripping characteristics in each pole). A push-to-trip button shall be provided on
the cover for mechanically tripping the circuit breaker. the circuit breaker shall
have reverse connection capability and be suitable for mounting and operating
in any position.
C. Terminations:
1. Circuit breakers shall have removable lugs. Lugs shall be UL listed for copper
and aluminum conductors. Breakers shall be UL listed for installation of mechanical
type or compression type lugs.
2.04
Current Limiting Circuit Breakers:
A. Description:
1. Current limiting circuit breakers from Square D shall be I-LIMITER IF (20-100
amperes), IK (110-250 amperes) and shall be rated at (240V.ac) (480V.ac) with an
interrupting rating of 100,000 rms symmetrical amperes. IL current limiting circuit
breakers (300-400 amperes) shall be rated (240V.ac) (480V.ac) with an interrupting
rating of 200,000 rms symmetrical amperes. All I-LIMITER circuit breakers shall meet
UL requirements as current limiting circuit breakers, be CSA listed, IEC 157-1 rated,
meet NEMA Standard AB1-1975 and Federal Specification W-C-375B/GEN.
B. Construction:
1. Current limiting circuit breakers shall be supplied in molded case construction.
The circuit breaker section shall have an overcenter, trip-free toggle-type
mechanism with quick-make, quick-break action. A push-to-trip button shall be
provided on the cover for mechanically tripping the circuit breaker. The circuit
breaker shall have permanent trip units containing individual thermal and
magnetic trip elements in each pole. The thermal trip element shall be calibrated
for 40 degrees C. ambient temperature. the breaker shall have reverse
connection capability and be suitable for mounting and operating in any position.
C. Terminals:
1. The current limiting circuit breakers shall have removable lugs. Lugs shall be UL
listed for copper and aluminum conductors. Breakers shall be UL listed for
installation of mechanical type or compression type lugs.
D. Current and Energy Limitation:
1. On high level fault currents, the I-LIMITER circuit breaker shall peak current and
let thru energy and provide a voltage transient-free interruption at near unity
power factor. On fault currents below the threshold of limitation, the I-LIMITER
circuit breaker shall provide conventional overload and short circuit protection.
E. Series Connected Ratings:
1. Combinations for series connected interrupting ratings shall be recognized by
Underwriters Laboratories and shall appear in the Recognized Component
Directory under the "Circuit Breakers -Series Connected" product category
DKSY2. Current limiting circuit breakers shall allow the use of branch circuit
JONES AIRWAYS LLC
CLEVELAND REGIONAL AIRPORT
MAA-12-11
ROBERDS P.E. 2012-224
16475-4
OVERCURRENT PROTECTION
breakers with lower interrupting capacities on systems capable of delivering fault
currents up to 200,000 rms symmetrical amperes at 480V.ac and 100,000 rms
symmetrical amperes at 600V.ac.
PART 3 - EXECUTION
3.01
Installation:
A. Install fuses in all switches shown on the plans which require fuses.
B. Fuses shall not be installed in the switch until equipment is ready to be energized.
C. Install "LOW-PEAK YELLOW" NOTICE labels to alert the end user of the
engineered level of protection of the electrical equipment. They shall be marked
with the proper fuse rating, per the drawings, and placed in a conspicuous location
on the enclosure. These labels are available with the spare fuse cabinet (SFC) and
are also available upon request from Bussmann.
3.02
Installation - Circuit Breakers
A. Install circuit breakers in panelboards, switchboards, distribution
panelboards, and enclosures as shown on the drawings.
B. Terminate wiring into circuit breaker lug. Tighten lug to torque level as marked
on the lug.
END OF SECTION 16475