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READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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[DIVISION 16: ELECTRICAL]{.underline}

SECTION 16411 ‑ CIRCUIT BREAKERS

USE: Furnishing and installing circuit breakers.

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[\_\_\_\_\_\] provide for information
to be inserted, as appropriate, to individual projects.

B. **TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES,** the
specifier must edit (delete, substitute or add to the text). The
remaining paragraphs must be renumbered.

C. DELETE FOR FINAL COPY: Notes to the Specifier, located between lines
of asterisks; all \[brackets\], [underlining]{.underline}, **boldface**,
and *italics*, within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately.)

D. [To Edit "(Footer B)":]{.underline} (Corel 8). **ENTIRE FOOTER SHOULD
BE BOLDED.** Click in the footer and delete the "Project Name (ftr B)"
text and replace it with the **Name of the Project (upper and lower
case)**. Replace date with current MM/YY (WITHOUT BRACKETS).

E. The Guide Specifications are intended to be continuously reviewed and
revised. User's technical comments are appreciated. Also, other related
or similar specification that are written "from scratch" that could
benefit others, or other questions can be sent to NSTC A/E Group, ST
110, or call (303) 987-6868.

**DRAWING DATA REQUIRED:**

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes: 12/01

Metric:

Technical Update: 2/97

**SECTION 16411**

**CIRCUIT BREAKERS**

**[PART 1: GENERAL]{.underline}**

**1.1 SUMMARY**

** A. Section Includes: \[Furnishing\] \[and\] \[installing\] circuit
breakers in panelboards or separate enclosures.**

**1.2 SUBMITTALS**

** A. General: Submittals shall be according to \[Section 01009 -
General Information and Requirements.\] \[Section 01300 - Submittals.\]
\[Section 01365 - Certificates of Conformance.\]**

** B. Manufacturer\'s Literature: Submit \[[ ]{.underline}\] copies of
the manufacturer\'s technical data for the circuit breakers to be used
on this project.**

**1.3 QUALITY ASSURANCE**

** A. Labeling Requirements: Circuit breakers shall be Underwriters
Laboratories, Inc. (UL) listed and labeled. UL listing and labeling will
not be required if it can be shown that circuit breakers meet the
requirements of another nationally recognized testing laboratory
(NRTL).**

**[PART 2: PRODUCTS]{.underline}**

**2.1 MATERIALS**

** A. General: Circuit breakers shall be constructed of the
manufacturer\'s standard materials, as listed in published product
information; types and sizes shall be as indicated or as required for
the installation.**

** B. Operating Mechanisms: Unless otherwise indicated, circuit breakers
shall be molded case. Circuit breakers shall have a toggle handle
operated, quick‑make, quick‑break switching mechanism which shall be
automatically tripped by thermally operated timed release mechanism on
overload, and by magnetically operated instantaneous release mechanism
on short circuit conditions. The toggle handle operating mechanism shall
be trip free and the trip mechanism shall have inverse time/current
characteristics. Automatic tripping shall be indicated by a handle
position between the \"On\" and \"Off\" positions.**

** C. Multi‑Pole Breakers: Shall have a common internal trip mechanism
with a single operating handle except that breakers rated 50 amperes or
less may consist of single‑pole breakers factory assembled into a
permanent multi‑pole unit with a non‑removable bracket to connect the
single‑pole handles firmly together.**

** D. Ratings: Current and voltage ratings and number of poles shall be
as indicated on the drawings. Symmetrical, short circuit current
interrupting capacity ratings shall be as follows:**

**  1. Breakers in branch circuit panelboards \[[ ]{.underline}\] amps**

** 2. Breakers in distribution panelboards \[[ ]{.underline}\] amps**

** 3. Breakers in motor control panelboards \[[ ]{.underline}\] amps**

** 4. Breakers in separate enclosure \[[ ]{.underline}\] amps**

** E. GFCI Breakers: Shall be designed to sense and interrupt a ground
fault current of 5 milliamperes and greater. The breaker shall include
circuitry and appropriately inscribed pushbuttons to manually test and
reset the ground fault circuit.**

** F. Single‑Pole Breakers for Panelboard Installation: Shall be full
module size (generally approximately one inch thick). Breakers
consisting of two poles which fit into a single full module space
(generally known as twin or tandem units) may only be used where
specifically indicated. **

** G. Breaker‑To‑Bus Connections in Panelboards: Shall be of the bolt‑on
type. Plug‑in breakers may only be used in loadcenters.**

** H. Separately Enclosed Breakers: Unless otherwise indicated or
required by the NEC, enclosures shall be NEMA Type 1 as described in
NEMA 250. In space where conduits are concealed, enclosure shall be
recessed. Enclosure shall be equipped with a groundable neutral terminal
insulated from the enclosure. Enclosure shall be equipped with a ground
terminal with metal‑to‑metal contact to the enclosure.**

**[PART 3: EXECUTION]{.underline}**

**3.1 INSTALLATION**

** A. General: Install circuit breakers as indicated, complying with the
manufacturer\'s written instructions, applicable requirements of codes
and standards, and according to recognized industry practices.**

** B. Terminal Connections: Torque circuit breaker‑to‑conductor
connections according to standard industry practice.**

** C. Breaker‑to‑Bus Connection in Panelboards: Screw down to factory
specified torque.**

** D. Conductors Per Pole: Do not connect more than one conductor per
pole on branch circuit breakers.**

** E. Separately Enclosed Circuit Breakers: Unless otherwise indicated,
install separately enclosed circuit breakers so that the top of the
enclosure is 72 inches above the floor.**

** F. Nameplate: Install a nameplate according to specification Section
16075 ‑ Electrical Identification, on each separately enclosed circuit
breaker.**

**[PART 4: MEASUREMENT AND PAYMENT]{.underline}**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**WHEN A \"LUMP SUM\" CONTRACT IS USED, DELETE THE TITLE PART 4:
MEASUREMENT AND PAYMENT, AND BOTH ARTICLES FROM THIS SECTION.
MEASUREMENT AND PAYMENT WILL BE ADDRESSED IN PART 4 OF SECTION 01010
-SUMMARY OF WORK.**

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**4.1 METHOD OF MEASUREMENT**

** A. Units: The work described in this section will not be measured for
payment.**

**4.2 BASIS OF PAYMENT**

** A. Payment: No direct payment for the work described under this
section will be made. Consideration for this item shall be included in
the bid price for other items of the Contract.**

**END OF SECTION**