Download part 2 products - Schneider Electric

Specification Number: 26 24 13.19
Product Name: BOLTED PRESSURE SWITCH MAIN, FIXED AND/OR GROUP MOUNTED
BRANCH FUSIBLE SWITCH (SHORT)
SECTION 26 24 13.19
SWITCHBOARDS (Short) Main Disconnect Individually Mounted
Fusible Switch (Bolted Pressure Switch)
Distribution Disconnect Group &/or Individually Mounted
Fusible Switches
PART 2 PRODUCTS
2.01 MANUFACTURERS
A. Shall be Square D Company or approved equal.
2.02 SWITCHBOARD - GENERAL
A. Utility Metering Compartment: The utility current transformer compartment shall comply
with the local utility construction specifications.
B. Short Circuit Current Rating: Switchboards shall be rated with a minimum short circuit
current rating of [
] rms symmetrical amperes at [_____] VAC maximum.
C. Future Provisions: All unused spaces provided, unless otherwise specified, shall be fully
equipped for future devices, including all appropriate connectors and mounting hardware.
D. Enclosure: Type [1 - General Purpose.][1 - With Drip Hood.][3R - Rain tight.]
1. Sections shall be aligned front and rear.
2. Removable steel base channels (1.5 inch floor sills) shall be bolted to the frame to rigidly
support the entire shipping section for moving on rollers and floor mounting.
3. The switchboard enclosure shall be painted on all exterior surfaces. The paint finish shall
be a medium gray, ANSI #49, applied by the electro-deposition process over an iron
phosphate pre-treatment.
4. All front covers shall be screw removable with a single tool and all doors shall be hinged
with removable hinge pins.
5. Top and bottom conduit areas shall be clearly indicated on shop drawings.
E. Nameplates: Provide 1 inch high x 3 inches engraved laminated (Gravoply) nameplates for
each device. Furnish black letters on a white background for all voltages.
F. Bus Composition: Shall be [plated copper] [plated aluminum]. Plating shall be applied
continuously to all bus work. The switchboard bussing shall be of sufficient cross-sectional
area to meet UL Standard 891 temperature rise requirements. The phase [and neutral]
through-bus shall have an ampacity as shown in the plans. For 4-wire systems, the neutral
shall be of equivalent ampacity as the phase bus bar. Tapered bus is not acceptable. Full
provisions for the addition of future sections shall be provided. Bussing shall include all
necessary hardware to accommodate splicing for future additions.
G. Ground Bus: Sized per NFPA70 and UL 891 Tables 25.1 and 25.2 and shall extend the entire
length of the switchboard. Provisions for the addition of future sections shall be provided.
2.02A SWITCHBOARD - INCOMING MAIN SECTION DEVICES
A. Main Fusible Device(s)
1. Fused Power Circuit Device(s)
a. Individually fixed mounted bolted pressure switch(s) through 4000 A.
b. Each device shall have power terminals to accommodate either cable or bolted bus
connections .
c. The over current protective device(s) shall be of the fusible bolted pressure contact
type as shown on the associated drawings.
d. Switches, with Class L fuse installed, shall be rated for use on systems capable of
delivering not more than 200,000 rms symmetrical amperes at 600 VAC maximum.
Switches shall have an interrupting rating of 12 times continuous ampere rating at
240, 480, and 600 VAC switches shall be 100% rated devices. Lugs shall be rated
for use with 90° C wire insulation (sized according to the 75° C temperature rating in
the NEC).
e.
All switches shall have switch blades which are fully visible in the Open (off)
position when the fuse access door is open. Bolted pressure contacts shall be made
by providing an additional pressure or clamping action at both ends of the switch
blade when the blades are fully closed. Switches having butt-type contacts are not
acceptable.
f. Manual operated switches shall have quick-make, quick-break front operating
mechanisms.
g. [Electrically Operated Switch]
1) Electric switches shall have a manual-charging, electric trip open, quick-make,
quick-break, front-operated mechanism with manual override.
h. Provisions for locking the switch in the Open (off) position with at least three
padlocks shall be provided. Switches shall have dual fuse door interlock designed to
prevent the fuse access door from being opened when the switch is Closed (on) and
prevents the switch being turned ON while the fuse access door is open. A means of
bypassing the interlock by authorized personnel shall be provided to allow the switch
to be inspected in the Closed position. An external mechanical flag shall be provided
to identify whether the switch is either Open or Closed.
i. Accessories shall be supplied as follows:
1) [Capacitor trip power supply]
2) [Blown main fuse protection]
3) [Blown main fuse indication]
4) [Phase failure relay with capacitor trip power supply]
5) [Key interlock]
6) [Equipment ground fault protection]
(a) Provide a zero sequence type ground fault system including current sensor
and appropriate relaying equipment. The current sensor shall enclose all
phase (and neutral, if present) conductors to be monitored. The current
sensor frame shall be so constructed that one leg can be opened to allow the
removal of the sensor without disturbing the cables or requiring drop-links
in the bussing. A test winding shall be provided to simulate the flow of
ground fault current through the current sensor for testing.
(b) The ground fault relay shall be of solid state construction and have
adjustable pick-up for ground fault currents from 100 amperes to 1200
amperes.
(c) Relays shall have ground fault zone selective interlocking to provide
maximum coordination selectivity. Settings for individual relays shall be
[as shown on the plans] [
amperes].
(d) Direct adjustable time delay shall be provided by the ground fault relay
circuitry and shall be nominally [.1 second] [.2 second] [.3 second] [.5
second]. The time delay shall be permanently calibrated to preclude
tampering after installation.
(e) Ground fault system to meet the on-site testing requirements of NEC article
230-95(c).
(f) Ground fault system shall be Square D type GC.
(g) Switches shall be BOLT-LOC as manufactured by Square D [or approved
equal].
2.02B SWITCHBOARD - DISTRIBUTION SECTION DEVICES
A. Branch Fusible Devices
(Select 1 or 2 or both)
1. [Fusible switch]
a. Group mounted, [30 through 600 A, Type QMJ] or [30 through 1200 A, Type
QMB].
b. Fusible switches shall be group mounted plug-on with mechanical restraint. No
additional hardware shall be required to mount the fusible switch into the
switchboard.
c.
Modular construction shall permit 30 through 1200 A devices to be field installed by
the Contractor due to a project change order or to accommodate future expansion.
d. Line side fusible switch connections are to be jaw type construction.
e. The operating mechanism shall be spring driven, with quick-make, quick-break
action. Operating handles shall be flange mounted as an integral part in the
operating mechanism. Switch contact shall be knife-blade and jaw construction.
Switch shall include visible blades as a positive blade status indicator.
f. Switches shall be secured to the bus with spring reinforced jaw assemblies. In the
event of a short circuit condition, the increased magnetic flux shall cause the jaws to
grip the bus more firmly.
g. Fusible switch units shall be equipped with all required mounting brackets and
guides.
h. Switch shall have dual cover interlocks designed to prevent the opening of the cover
when the switch is ON. The cover interlock shall prevent the switch from being
turned ON with the cover open. Interlock may be manually overridden for testing
purposes. Switch cover shall include a means by which the cover can be padlocked
in the closed position. The operating handle shall feature positive lock-off means by
providing provisions for (3) .375 in padlocks.
i. There shall be two forms of visible ON/OFF indication:
j. A dual-color operating handle and a large steel ON/OFF nameplate with the O/I
international markings. The universal nameplate shall be readable regardless of the
switch orientation. Each nameplate shall furnish an easily removable circuit
directory card.
k. Fusible switches shall be UL Listed when equipped with field installable accessories:
Compression lugs, copper mechanical lugs, and electrical interlocks.
l. 30 through 100 A fusible switches shall have fuse pullers provided. The fuse puller
design shall be of the type that the line side of the fuse is disconnected from the
switch before the load side of the fuse is removed.
m. Fuse clips shall be designed to accommodate Class (Select one) [H] [J] [R] [T] fuses
for 30 through 600 A. Class L fuses shall be used on all devices above 600 A.
2. [Fused power circuit devices]
a. Individually fixed mounted bolted pressure switch(s) through 4000 A.
b. Each device shall have power terminals to accommodate either cable or bolted bus
connections.
2.03 METERING (CUSTOMER)
A. Manufacturers:
1. [Square D] Model [PM 650].
2. [Square D] Model [CM 2350].
3. [_______ ] Model [_________].
4. Substitutions: substitutions shall be made only after proper verification
2.04 METERING TRANSFORMERS
A. Manufacturer: Shall be Square D Company.
B. Current Transformers: ANSI C57.13; 5 ampere secondary.
C. Voltage Transformers: ANSI C57.13; 120 V single secondary. (Not required for type PM
meters)
2.05 ACCESSORIES
A. For switchboards installed outdoor only, provide thermostatically-controlled electric heaters
in each section. [Provide terminals for separate source connection of heater power circuit.
Voltage Rating: [120] [
] V.] [Provide control power transformer with the total VA
rating of the electric heaters in the switchboard.)
2.06 RELATED SECTIONS
A. [Section 16290-3]- ELECTRICAL POWER MONITORING & COMMUNICATION
B. [Section 16280-1] - TRANSIENT VOLTAGE SURGE SUPPRESSION DEVICES IN
SWITCHBOARDS & SWITCHGEAR
C. [Section 16415-1] - AUTOMATIC TRANSFER SWITCHES IN LOW VOLTAGE
EQUIPMENT