Table of Contents
Is touch current the same as leakage current?
3.3 Enclosure leakage current or touch current The terms “enclosure leakage current” and “touch current” should be taken to be synonymous. The former term is used in the bulk of this text.
What is touch leakage current?
A Leakage current is a current that flows from live parts of a device, through isolation, to the ground. Touch leakage current: the leakage current is measured by taking into account human perception and response in accordance with PN-EN 60990 (internal resistance of the test probe = 2kΩ).
What is PE conductor current?
Earth Leakage (Protective Conductor Current Test) This test is designed to to see if there is any leakage current flowing from the live wire to the earth wire (protective conductor) of a Class 1 appliance.
What is a touch current test used to assess?
The Tester detects any current flowing in the Earth Bond Lead (attached to an appropriate point on the appliance) and indicates the potential leakage through a metal panel.
What causes earth leakage?
Causes of Earth Leakage Earth leakage may occur in underground transmission lines due to insulation damage of cables. So when earth leakage occurs due to insulation failure of the live conductor, leakage current flows from the transformer or motor body to ground through the grounding conductor.
What is the leakage current test?
The leakage current test is the current flowing over the error-free insulation of a device to the earth or to another conductive part – such as the housing.
What is touch voltage definition?
The term touch voltage refers to the shock hazard present on any exposed metalwork or protective conductor. The voltage exists if there is a higher resistance earth path to the exposed metalwork than to the ground beneath your feet or another piece of exposed metalwork in close proximity, as shown in figures 1a & 1b.
How does touch current measurement work?
Touch Current measurement; showing how it works. A ‘read’ is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Explanation of thuch current measurement process based upon IEC 60990.
What resistor is used in a touch current test?
The test instrument uses a 2kΩ resistor to represent the current that would typically flow through the human body. The leakage test on Class II equipment is referred to as a Touch Current Test.
What is a protective conductor/touch current test?
“The protective conductor/touch current test is an alternative or complementary test to the insulation tests of Section 15.5, for use if the insulation tests cannot be performed or give suspect results.”.
What is the touch current test for Class 2 appliances?
The touch current test is identical to the Earth Leakage test except for one important aspect. Since Class 2 appliances do not have an earth connection, the test lead is connected to an exposed metal part. It is called the Touch Current test as it measures the current that would flow through a person if they were touching the appliance.