CT70 V7.0 09/10
10
Test 7: EPD (Equipment Protective Device) GFCI Testing
An EPD device can protect equipment as well as personnel. The CT70 tests EPD circuits
by forming a Hot-Neutral imbalance, leaking current from Hot to Ground through a fixed
resistance. A larger amount of current (30mA) is used than would normally be used to test a
standard GFCI (6 to 9mA). A good EDP/GFCI circuit will sense this imbalance and switch
off the power. The CT70 displays the current value in mA.
To test an EPD/GFCI circuit:
1. Plug the meter into the receptacle under test.
2. Press the CT70 GFCI button to enter the GFCI test mode menu.
3. GFCI is the default test and the letters ‘GFCI’ will appear on the lower left side of
the meter’s display. Press the
►
button once to switch to ‘EPD’.
4. Now follow steps 4 through 8 in Test 6 (GFCI) above.
