Related Manuals for Extech Instruments CT80
Summary of Contents for Extech Instruments CT80
- Page 1 User Guide AC Circuit Load Tester For use on EPD, GFCI, and AFCI Circuits Model CT80 ShopExtech 1.877.766.5412 Shop for Extech products at:...
- Page 2 The CT80 can be used reliably on GFCI, EPD, and AFCI circuits. Circuit and wiring issues listed above can introduce shock hazards (from grounding issues) and can comprise performance of machinery and equipment (from poor ground impedance, lack of sufficient voltage under load and/or high ground-to-neutral voltage).
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Page 3: Safety Symbols
Always test the CT80 on a known line voltage source to confirm proper operation before and after performing tests on other circuits. Do not use the CT80 if it appears damaged or if the operation of the unit is inconsistent with the supplied user guide instructions. ... -
Page 4: Meter Description
Equipment Protection Device test Overload m, M, k Unit of measure prefixes: milli, mega, and kilo Greater than’ symbol ‘>’ ‘ Over-temperature alarm (meter operation pauses until cool-down) AFCI test in progress ShopExtech 1.877.766.5412 Shop for Extech products at: CT80-EN V1.1 08/12... -
Page 5: Operation Overview
Operation Overview The CT80 AC Circuit Load Tester can test outlets or circuits under load in a matter of seconds for proper wiring, reverse polarity, and the presence of a ground. The CT80 uses a simple menu-driven display to allow the user to quickly see line voltage, voltage drop under full load, ground-to-neutral voltage, and line impedance. - Page 6 H - G Reversed (blank display) Note: For open HOT, open NEUTRAL, and H-G polarity reversal conditions, the meter is completely switched OFF and therefore no display or LED status is available. ShopExtech 1.877.766.5412 Shop for Extech products at: CT80-EN V1.1 08/12...
- Page 7 This test applies 300mA between hot and neutral to ensure that the AFCI breaker does not trip. Refer to the testing procedures below for more detailed and application specific testing information. ShopExtech 1.877.766.5412 Shop for Extech products at: CT80-EN V1.1 08/12...
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Page 8: Testing Procedures
For wiring conditions other than normal, the CT80 is limited in the type of tests it can perform on a circuit until the circuit’s wiring issues are resolved. For ‘no ground’ conditions, only the line voltage and voltage drop tests can be made. - Page 9 Test 3: Voltage Drop Measurements To determine voltage drop, the CT80 measures line voltage, factors in the load, measures the loaded voltage, and then calculates the voltage drop. Results for 12A, 15A, and 20A loads are provided. For nominal efficiency, a voltage drop of 5% is the maximum recommended by the National Electrical Code (NEC) board.
- Page 10 Test 5: Impedance (Z) Measurements The impedance measurement capability of the CT80 is used to check Hot and Neutral impedance when voltage drop measurements are too high (greater than 5%). To determine where the problem is, measure the impedances and analyze the data as follows: ...
- Page 11 5. The GFCI circuit should typically trip within 200ms (the meter’s display will switch off because the power has been removed by the GFCI circuit). 6. When the GFCI circuit is reset, the CT80 will display the elapsed time from start of test to power down.
- Page 12 (from the loss of power). If the AFCI fails to trip, the CT80 will not lose power and the display will show a dimly lit lightning bolt symbol. This non- trip condition would suggest: ...
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Page 13: Maintenance
Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or solvents to clean the instrument. Pack and store the meter safely when not in use. Do not allow the meter to remain connected to live circuitry when not in use. ShopExtech 1.877.766.5412 Shop for Extech products at: CT80-EN V1.1 08/12... -
Page 14: Specifications
IEC1010-1 (2001): EN61010-1 (2001) Overvoltage Category II 300V Pollution Degree 2. Copyright © 2012 Extech Instruments Corporation (a FLIR company) All rights reserved including the right of reproduction in whole or in part in any form www.extech.com...