hipot.com 39
Test Operator Safety Considerations
1. Qualications
This tester generates voltages and currents which can cause harmful or fatal electric shock and must only be operated
by a skilled worker trained in its use.
The operator should understand the electrical fundamentals of voltage, current, and resistance.
2. Safety Procedures
Operators should be thoroughly trained to follow these and all other applicable safety rules and procedures before they
begin a test. Defeating any safety system should be treated as a serious oense and should result in severe penalties,
such as removal from the Hipot testing job. Allowing unauthorized personnel in the area during a test should also be
dealt with as a serious oense.
3. Dress
Operators should not wear jewelry which could accidentally complete a circuit.
4. Medical Restrictions
This tester should not be operated by personnel with heart ailments or devices such as pacemakers.
5. Test Procedures
If the tester has an external safety-ground connection, be sure that this is connected. Then connect the return lead
rst for any test regardless of whether the device under test is a sample of insulating material tested with electrodes, a
component tested with the high voltage test lead, or a cord-connected device with a two or three-prong plug.
Plug in the high voltage test lead only when it is being used. Handle its clip only by the insulator---never touch the clip
directly. Be certain that the operator has control over any remote test switches connected to the Hipot. Double-check
the return and high voltage connections to be certain that they are proper and secure.
When testing with DC, always discharge the capacitance of the item under test and anything the high voltage may have
contacted--such as test xtures--before handling it or disconnecting the test leads.
Hot stick probes can be used to discharge any capacitance in the item under test as a further safety precaution. A
hot stick is a non-conducting rod about two feet long with a metal probe at the end which is connected to a wire. To
discharge the device under test, two hot sticks are required. First connect both probe wires to a good earth ground.
Then touch one probe tip to the same place the return lead was connected. While holding the rst probe in place, touch
the second probe tip to the same place where the high voltage lead was connected.
WARNING
NEVER PERFORM A HIPOT TEST ON ENERGIZED CIRCUITRY OR EQUIPMENT!
WARNING
NEVER TOUCH THE ITEM UNDER TEST OR ANYTHING CONNECTED TO IT WHILE HIGH VOLTAGE
IS PRESENT DURING THE HIPOT TEST.
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