This Megger lead set with medium insulated clips includes one red, one blue, and one black test lead for use with Megger 5- and 10-kilovolt (kV) insulation resistance testers. Each test lead has a medium test clip for hands-free connection to a large conductor where there is limited access. Silicone insulation on the lead wires and test clips helps protect hands from shock and heat, resists melting or becoming brittle in hot or cold environments, and maintains flexibility better than PVC insulation. The test leads lock into the input jacks on the meter to help ensure a secure connection and reduce risk of shock. The medium test clips measure 2.9" x 5.4" (73 x 139 mm, W x D, where W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back) and have a 1.3" (34 mm) jaw opening. The insulated clips are rated for a maximum input of 6 kV of direct current (DC) voltage. They meet International Electrotechnical Commission (IEC) safety standard 61010 and are certified for use with category IV installations up to 600V, which covers measurements at the source of the low-voltage supply, such as electricity meters and overcurrent protection devices. The insulated leads are rated for a maximum input of 12 kV of DC voltage.
A test probe, test lead, test prod, or scope probe transmits an electrical signal to a testing device for display and analysis. Designs range from simple test leads with probe-style or clamp-on tips to more complex oscilloscope probes and current detectors. Some test probes, such as basic test leads, have wires with tips for connecting to test equipment. Other test probes, such as voltage detectors, are built into the meter. Depending on what is to be tested, the probe might either be passive or have active parts that require external power to operate. Some probes require contact for testing, while some are capable of taking measurements from a distance. Some also have finger barriers, insulation, or other features to help protect the operator's hand from electrical shock and burns. Test probes are rated according to the amount of voltage, current, temperature, or other input they can measure. When choosing a test probe, the maximum amount of input that the probe can measure should match or exceed both the maximum amount that can be tested by the test equipment, as well as that of the property expected to be present in the application.
Megger manufactures equipment for cable fault locating, protective relay testing, telecommunications and data integrity, and power quality testing under multiple brand names, among them Megger, Biddle, States, and AVO. The company, founded in 1889, is headquartered in Dover, England, and meets International Organization for Standardization (ISO) 9001:2008 standards.