University of Manitoba
MAIN DISTRIBUTION SWITCHBOARD
Section 16404
Req. #
1.1
Page 1
RELATED WORK
.1
Basic Electrical Materials and Methods
.2
Circuit Breakers
.3
Conduit
.4
Wire and Cable
Section 16050
Section 16182
Section 16111
Section 16120
1.2
DESCRIPTION OF EQUIPMENT
.1
Main distribution board incorporates service entrance cable connection section, main breaker
complete with built-in ground fault, sub-feeder distribution section, customer metering section
and Kirk interlock and tie breaker section, factory assembled in one enclosure or as indicated
to suit each specific project.
1.3
SUBMITTALS
.1
Submit shop drawings and product data in accordance with Section 16050.
.2
Indicate:
.1
Floor anchoring method and foundation template.
.2
Dimensioned cable entry and exit locations.
.3
Dimensioned position and size of bus.
.4
Overall length, height and depth.
.5
Dimensioned layout of internal and front panel mounted components.
.6
Shipping sections and weights.
1.4
MAINTENANCE DATA
.1
Provide data for incorporation into Maintenance Manual specified in Section 16050.
1.5
MAINTENANCE MATERIAL
.1
One set spare parts as recommended by Manufacturer.
1.6
SOURCE QUALITY CONTROL
.1
Refer to Section 16050.
2.1
MATERIALS
.1
Service entrance board: to CSA C22.2 No. 31.
.2
Molded case circuit breakers: to CSA C22.2 No. 5.
.3
Meters: to CSA C17.
.4
Meter mounting devices: to CSA C22.2 No. 115.
.5
Digital instruments: to ANSI C39.1 and UL508.
.6
Instrument transformers: to CSA C13.
2.2
POWER SUPPLY
.1
Power supply: 3 phase, 4 wire, grounded neutral, 60 Hz, short circuit current rated at 42 KA
RMS symmetrical min. and as required by Short Circuit Study (refer to Section 16050).
2.3
SERVICE ENTRANCE SWITCHBOARD
.1
Ampere rating: as indicated on the drawings and 100% rated.
.2
Enclosure:
.1
Free-standing, totally enclosed sheet steel, ‘sprinklerproof’ enclosure with steel frame.
.2
Sheet steel barriers to separate adjoining sections.
.3
Provision for installation of supply authority metering transformers.
.4
Customer metering instruments, transformers and selector switches.
.5
Distribution section.
.6
Hinged access panels with captive knurled thumb screws. Utility metering section to have
provision for utility seals.
.7
High conductivity copper bus.
Date revised December 18, 2012
University of Manitoba
MAIN DISTRIBUTION SWITCHBOARD
Section 16404
Req. #
Page 2
.8
.9
Bus from load terminals of main breaker via metering section to main lugs of distribution
section.
Identify phases with color coding.
2.4
MAIN BREAKER SYSTEM
.1
Main breaker shall be sized to suit each specific project complete with all specified features
and accessories.
2.5
GROUNDING
.1
Copper ground bus extending full width of cubicles and located at bottom.
.2
Lugs at each end sized for grounding cable.
.3
Bond non-current carrying metal parts to ground bus.
2.6
METERING SECTION
.1
Separate compartment for exclusive use of metering transformers.
.2
Provide mounting and wiring for the following:
.1
potential transformers
.2
current transformers
2.7
CUSTOMER METERING SECTION
.1
Provide one Elkor model ETM3.2, 3 phase power line transducer for each main service and
for each DMS noted on Single Line Drawings.
.2
Instrument Transformers:
.1
The switch gear manufacturer shall supply and install all the required instrument
transformers on the secondary circuits indicated by the Owner/Engineer.
.2
Low voltage distribution system (up to 600V) require current transformers only.
.3
Metering class, 5A secondary, current transformers shall be properly sized for the load and
installed in each phase of the selected circuits.
.4
The circuits to be equipped with metering transformers include the main feeders and other
circuits as indicated by the Owner/Engineer.
.3
Test Switches:
.1
The instrument transformers shall be wired to a test switch located outside the switch
gear and accessible to the Owner’s technical personnel.
.2
The test switch establishes the interfacing point for Owner’s metering. It facilitates inposition power quality testing, meters/transducers replacement or addition and shortcircuits current transformer secondary’s to prevent a high voltage hazard.
.3
If no potential transformers are used (ie: 208V system) the properly fused phase
voltages shall be wired to potential poles of the test switch.
.4
Phase rotation and marking at the test switch shall be consistent throughout the
system.
.5
The following, or similar, test switches may be considered:
Flexitest Switch Type FR-1 manufactured by Asea Brown Boveri (ABB)
Test Switch Model 11519 by Sangamo Weston (Schlumberger)
Model U3889 Switch Assembly by Flex-Core (USA)
.4
Metering Equipment:
.1
The power transducer shall be micro-processor based, capable of high rate digital
sampling of current and voltage signals to provide accurate, true RMS metering.
.2
The overall accuracy of the metering devices shall be in line with metering
transformers’ accuracy and with the character of metering application.
.3
For energy management and building submetering application, 1% system accuracy
is acceptable. No annual recalibration by the user shall be required.
.4
The transducer shall provide analog, DDC compatible output signals of 0-5VDC or 420mA (sourcing), proportional to the following parameters:
voltage-to-neutral for each phase
Date revised December 18, 2012
University of Manitoba
MAIN DISTRIBUTION SWITCHBOARD
Req. #
Section 16404
Page 3
.5
.6
.7
.8
.9
.10
.11
.12
.13
.5
.6
current in each phase
power fault
instantaneous kW (demand)
In addition, one form ‘C’ dry contact output shall provide pulses proportional to energy
consumption (kWh). The pulses shall be compatible with a standard Digital Input of a
generic DDC panel (last at least 5 sec so that the panel can record them properly).
All output signals shall be isolated from the input. The analog output signal’s
‘Common’ shall be grounded through the DDC System.
The transducer shall accept 600V directly as well as inputs from industry standard
instrumentation transformers (120VAC secondary from PTs and 5A or 1A from CTs).
Both, current and voltage inputs shall be galvanically isolated from the transducer’s
electronics.
The transducer shall present minimum burden (less than 0.5VA) in current inputs so
that small VA CTs or the existing CTs can be used without accuracy deterioration.
The transducer shall operate properly over a wide range of input voltages and
currents.
Continuous overload of 200% of the rated current input shall not damage the
meter.
Line voltage fluctuations up to 20% shall not affect the accuracy.
The transducer shall store all set-up parameters in non-volatile memory that does not
require any batteries.
In addition to analog output signals representing all measured and calculated
parameters as per Item .4, the transducer shall be equipped with an RS232 port for
user’s programming and remote monitoring via standard Hayes compatible modem.
The RS232 communication shall use plain ASCII format that allows the use of any
generic communication software with user’s DOS based PC.
The transducer shall be housed in a standard electrical enclosure allowing its
installation in the switch gear, on the switch gear or remotely from the switch gear in
a location convenient to the user (ie: on the wall or beside the DDC panels). The
enclosure shall permit metal or EMT conduit wiring.
The transducer shall support a local or a remote display to allow on-site viewing of all
the measured and calculated parameters. If equipment with the display, the total
accumulated kWh shall be stored in non-volatile memory during power shut-downs or
momentary breaks.
Wiring:
.1
Wiring from transducers shall be minimum #14 AWG 600 Volt Armoured Cable with
PVC Jacket with multiple twisted shielded pairs. Provide minimum 3 pair cable per
transducer and terminate as noted on Drawing.
Confirm exact specification for customer metering with University of Manitoba Control Shop,
contact Mike Ferley at 204-474-6467.
2.8
DISTRIBUTION SECTION
.1
The distribution section shall consist of a CDP type panelboard with molded case circuit
breakers. Each breaker shall be manually operated, fixed type with trip ratings as shown on
the drawings. Minimum interrupting rating shall be 42,000 amps symmetrical and as required
by Short Circuit Study (refer to Section 16050).
.2
The distribution section shall be provided with a minimum of 8-200 amp, 3 pole frame spaces,
each with mounting hardware.
.3
Provide doors for the CDP Section of Main Distribution.
2.9
FINISHES
.1
Apply finishes in accordance with Section 16050:
.1
service entrance switchboard finish shall be exterior gray
.2
supply 2 spray cans of touch-up enamel
Date revised December 18, 2012
University of Manitoba
MAIN DISTRIBUTION SWITCHBOARD
Req. #
Section 16404
Page 4
.3
treated to inhibit rusting.
2.10
EQUIPMENT IDENTIFICATION
.1
Provide equipment identification in accordance with Section 16050.
.2
Nameplates:
.1
Black plate, white letters, size 5, to indicate
Line 1 – Distribution, Voltage & wires.
Line 2 – Fed from (Transformer/CDP).
Line 3 – Transformer / CDP location.
.2
Complete switchboard: labeled as above main disconnect: labeled “Main Breaker”
.3
Sub-breakers: labeled to indicate panel or equipment fed.
2.11
SHOP FABRICATION
.1
Assemble and wire complete service entrance board.
.2
Energize switchboard.
.3
Check meters and phase selector switches.
.4
Prepare switchboard for shipment to site.
2.12
MANUFACTURERS
.1
Acceptable manufacturers: Cutler Hammer and Square D.
2.13
FUTURE ENERGY MANAGEMENT
.1
Provide terminal board and wiring from separate customer CT’s and PT’s to facilitate the
future installation of thermal demand, watt hour energy management equipment, recorders,
etc., where applicable.
3.1
INSTALLATION
.1
Locate service entrance switchboard as indicated.
.2
Connect main secondary service entrance cables to line terminals of switchboard.
.3
Connect load terminals of distribution breakers to outgoing feeders, as indicated.
.4
Check factory-made connections for mechanical security and electrical continuity.
.5
Run one #3/0, bare copper, grounding conductor in 1" (27 mm) conduit from ground bus to
the main building ground.
.6
Check relay settings against shop drawings to ensure proper working and protection of
components.
.7
Manufacturer shall provide test equipment and field test overload, magnetic and ground fault
tripping. Include test report in Maintenance Manuals.
.8
Arrange for main distribution switchboard to be mounted on 4" (100 mm) housekeeping pad.
.9
Switchboard manufacturer shall provide a coordination and short circuit study and submit to
Consultant with switchboard shop drawings.
Date revised December 18, 2012