Outdoor Load Break Switches and Fuses

NL Master Specification Guide

for Public Funded Buildings

Issued 2008/03/18Section 26 28 13.02 – Outdoor Load Break Switches and FusesPage 1 of 4

Part 1General

1.1SECTION INCLUDES

.1Materials and installation for outdoor load break switches and fuses.

1.2RELATED SECTIONS

.1Section 013300 Submittal Procedures.

.2Section 017800 Closeout Submittals.

.3Section 260500 - Common Work Results - Electrical.

1.3REFERENCES

.1American National Standards Institute (ANSI)

.1ANSI C37.46, Specifications for High Voltage Explosion and CurrentLimiting Type Power Class Fuses and Fuse Disconnecting Switches.

.2Electrical and Electronic Manufacturers Association of Canada (EEMAC)

.1EEMACG11, Indoor and Outdoor Switch and Bus Insulators.

.3National Electrical Manufacturers Association (NEMA)

.1NEMA SG2, HighVoltage Fuses.

1.4SHOP DRAWINGS AND PRODUCT DATA

.1Indicate:

.1Load break mechanism.

.2Switching type.

.3Mounting design.

.4Fuse holder mechanism.

.5Gang operating mechanism.

.6Load rating.

1.5EXTRA MATERIALS

.1Provide maintenance materials in accordance with Section 017800 Closeout Submittals.

.2Include: as recommended by manufacturer.

Part 2Products

2.1MATERIALS

.1Fuses: to NEMA SG2 and ANSI C37.46.

.2Insulators: to EEMAC G11, as indicated.

2.2LIGHT LOAD AIR BREAK SWITCHES

.1Horizontal mounted, vertical break, rotating insulator, gang operated, single throw, 3 pole.

.2Rating: 600A, 5, 15 kV, as indicated.

.1Momentary rms asymmetrical A: 18,000 or as indicated.

.3Insulators: post type.

.4Universal mounting base for each pole designed for woodmounting, as indicated.

.5Arc horns: galvanized steel to permit switch opening and closing under light load, magnetizing or charging currents.

.6Bearings: silicone grease lubricated for life.

.7Interphase mechanism assembly:

.1Operated from center end.

.2Outside poles connected to center pole through end yoke assemblies, pipe turnbuckles and universal ball and yoke assembly to permit switch operation with up to 15 degrees misalignment of pole bases.

.3Bearings and moving joints on each pole and interphase mechanism positively sealed by silicone cord rings.

.8Manual operating mechanism with:

.1One offset bearing.

.2Pipe shaft: length as indicated.

.3Pipe guides.

.4Pipe couplings.

.5Position indicator.

.6Foot bearing.

.7Operating handle with padlock.

2.3FULL LOAD AIR BREAK SWITCHES

.1Horizontal, vertical or invertedmounted, as indicated, vertical break, gang operated, single throw, 3 pole, as indicated.

.2Rating: 600 A, 5, 15 kV, as indicated.

.1Momentary rms asymmetrical A: 18,000 or as indicated.

.3Insulators: three per pole, standard station post type.

.4Contacts:

.1Silvernickel alloy spring loaded multicontactswitch blade contacts.

.5Interrupter unit to permit opening and closing under rated full load currents consists of:

.1Mechanism actuated by levers for operating contacts.

.2Bolted to fixed contact assembly of switch.

.3Shunt contact bolted to switch blade actuates interrupter unit when blade is moved to open or closed position.

.6Switch base: 5 mm formed channel galvanized steel drilled for universal mounting on wood pole.

.7Interphase mechanism assembly.

.1Operated from center pole.

.2Poles interconnected by articulated pipe assembly to allow for minor misalignment.

.8Manual operating mechanism with:

.1Twooffset bearings.

.2Pipe shaft: length as indicated.

.3Pipe guides.

.4Pipe couplings.

.5Position indicator.

.6Foot bearing.

.7Operating handle with padlock.

2.4PRIMARY FUSES

.1Disconnect vertical, 180 degrees opening type.

.2Voltage rating: as indicated.

.3Continuous current rating: 200, 300,400 or 720 A, or as indicated.

.4Three phase symmetrical short circuit ratings:

.1150 MVA at 4.16 kV.

.2400 MVA at 13.8 kV.

.5Refill unit consisting of:

.1Fusible element: silver.

.2Arcing rods: main rod copper, silver clad, auxilliary rod stainless steel.

.3Solid material arcextinguishing medium contained in filament wound glassepoxy tube.

Part 3Execution

3.1INSTALLATION

.1Install in accordance with manufacturer's instructions.

.2Connect switch terminals to primary feeder and load feeder.

.3Locate, mount and connect fuses.

3.2FIELD QUALITY CONTROL

.1Perform tests in accordance with Section 260500 - Common Work Results - Electrical.

.2Energize and load feeders controlled by load break switches.

.3Open and close load break switches at least ten times over period of 8 hours to ensure proper mechanical and electrical performance of installation.

END OF SECTION