FT TEST SWITCH

FT TEST SWITCH AND TEST PLUG

APPLICATION

The ITI Type Test Switches and Test Plugs provide a safe, simple, fast and reliable method to isolate andservice installed equipment.

KEY Benefits

The FT Switches and FT Test Plugs have all the features necessary for applications involving themeasurement of individual currents and voltages to facilitate testing of substation instrumentation and protection devices from the front of the panel. The make-before-break current short circuitfeature also allows test personnel to test quickly and safely.

The FT Switch is built with a maximum of ten individual poles, or switch units.The switches can be assembled in a variety of different arrangements to match customer requirements.

ITI FT Test plugs are used in conjunction with the FT Switches to enable easy measurement,calibration, verification or maintenance of relay, meters and instruments.

Drilling Plan - Inches

Weight NetLbs.

ShippingLbs.

FT Switch 1.4 1.6

Test Plug 1.2 1.4

Voltage measurements can also be made directly on the FT Switch without disturbing existing connections. There is a test clip provision located on the top of each pole that allows connection with stan-dard spring clip test leads.

Protection

With the cover in place, a meter type seal can be placed through either of the cover studs of the FT Switch to prevent unauthorized access to the switch. As an additional feature, a clear cover is available that can be installed and locked with the switchblades in the open or closed position.

SPECIFICATIONS

Rating

The standard FT Switches is rated at 600 volts and 30 amps. The Switch meets or exceeds all requirements of ANSI/IEEE Standard C37.90.

Mounting

FT Switch are designed for semi-flush mounting on the front of switchboard panels, facilitating inspection and accessibility.

FT Switch Construction

The base of the FT Switch is made of black electrical grade plastic material, which provides atough, insulated enclosure. Barriers are molded into the base (front and rear) to separate the switch units from one another. The barriers provide insulation between poles, and also ample space between termi-nals.

Cover

FT Switches come with a black opaque cover or a clear see-through cover. Switch covers provide a toughinsulated enclosure for the switch and are made from plastic material. The clear cover affords the user theoption of leaving switch handles in the open position and replacing the cover whilemaintaining the provision for a meter type seal when some or all switch handles are in the open position. This feature allows the user to service electrical equipment while still complying with OSHAlockout/tagout procedures. The clear cover can be ordered separately for retrofit to existing FT Switches.

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Switch Poles

FT Switches are available in configuration of 1 to a maximum of 10 individual poles or switch units. Each pole is identified by a letter (A to J), which is visible along the top of the base from left to right. The indi-vidual switch units are of knife blade type. There are two different types of switch units available: potential poles and current poles.

Figure 2. Blade assembly of two position pole “C-C”(Rear View, outside of base)

Switch Handles

Switch handles are made of a molded plastic insulating material. The standard handle color is black. Red isavailable upon request.

Each handle has a dovetail indentation to hold a circuit identification label. Knife blade switches can be operated independently, or ganged together with a horizontal interlocking bar, tosuit testing needs. (See Figure 3)

A hole runs through the middle of each switch handle to allow insertion of interlocking bars,2 to 10 switch handles can be mechanically tied together.

For red potential switch handles replace the “P” with “T”.For red current switch handles replace the “C” in any position with “R” Consult the factory for other colors.

SHORTING BLADE

SHORTING SPRING

NON-SHORTING BLADE

CURRENT TEST JACKBefore the shorting bladedisengages from the jaw,the bottom cam on blade makes contact with theshorting spring.

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Terminals

Connection terminals are located at the rear of the switch and can be either screw or stud type. Terminals arenumbered 1 to 20 for easy identification (rear view) Each pair of numbered terminals is associated with amatching pole designated by a letter on the front of the switch. (See Figure 4.)

Figure 4. FT Switch

Test Plugs

The Test Plug with a maximum of 10 positions is designed to match the pole configuration of specific stylesof FT Switches. Not every switch or relay pole configuration is suitable to accept a Test Plug. For available styles, see switch selection tables.

This Test Plug is typically used to connectdevices measuring the current and voltages being applied to the switchboard relays, meters and instruments without interrupting or short-circuiting the circuit. Only the currenttest switches with the current jack must be opened before inserting the Series Test Plug.Connections to the test plug must be made before inserting the test plug into the FT Switch.

Figure 5 In-Service Series Test Plug

TERMINALNUMBERS ON REAR VIEW

POLE POSITIONS AS SHOWN ON FRONT VIEW

DOVETAIL INDENTATION

INTERLOCKING BAR

Figure 3

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Separate Source Test Plug

Provision is made only on current poles with shorting springs to automatically short-circuit currenttransformer circuits when the knife switches are opened prior to inserting the Test Plug.

Figure 6. Test Plug, Style

The 10 Position Test Plug isolates the external connections from the relay or equipment under test. This Test Plug provides quick circuit testing by fitting into the stationary contactjaws of a specific FT Switch. The blades connect the relay inputs and outputs to a set of binding posts on the top of the Test Plug. The external test circuits can then be connected to these binding posts, which are staggered for easyaccessibility but in line with the correct stab.

Before inserting the Test Plug, all switches that are opposite bi-conductor paddle switchblades mustbe placed in the full open position.

POTENTIAL PARALLEL CON-NECTION

POTENTIAL STAB

POTENTIAL BINDING POST

CURRENT SERIESCONNECTION

BI-CONDUCTOR PADDLE

CURRENT BINDING POSTS

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P C - - C R C R - -R P P P

Factory Use OnlyCatalog Number Assignment______________________

Or Studs

Non Standard FT Style Switch Selector

Step 1 The Switch body can support 1 to 10 poles in slot marked A through JEnter a letter from the legend. Leave unused slots blank.

A B C D E F G H I J Position:

Example: A B C D E F G H I J

Legend P=Potential, BlackT=Potential, RedC=Current, Non-shorting, BlackC-C or C-C-C- or C-C-C-C = Current , Non-shorting, BlackR-R, R-R-R, R-R-R-R = Current, Non-shorting, Red(Note: some functions will require more than one slot in the switch body)

Step 2 (Optional)If a tie bar is required then check this boxand draw a dark heavy line over the poles to be joined.(In the example above positions H, I and J will operate together.)

Step 3 Select a cover styleClear (installs over open closed switches)

Black (installs only over closed switches)

Step 4 Select a rear terminal type

Screws (Standard)

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CoverBlack----------(Blank)Clear----------C

ConfigurationSee ChartTerminalsScrews---------(Blank)Studs---------S

FT C - 074 S

CATALOG NUMBER FOR FT STYLE SWITCHES

FT TEST SWITCH

EXAMPLE: FT-074S IS A PPP C-C C-C C-C P SWITCH WITH A BLACK COVER & STUD TERMINALS

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CONFIGURATION SELECTION CHART

A B C D GE F H I J

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A B C D E F G H I J

CONFIGURATION SELECTION CHART

MULTI-CIRCUIT TEST SWITCH TYPE FT

Clear cover and stud terminals

Black cover and screw terminals

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