It may be necessary to make up a special lead with the earth wire separated from the other wires. a PE current of no more than 30% of 30mA which is just 9mA. Earth leakage current is the current that normally flows in the earth conductor of a protectively earthed piece of equipment. Most of the time, earth leakage protection works just as intended, but “nuisance” tripping can occur, where the RCD or RCBO trips for no apparent reason. Visual inspection: This is where the electrician will survey the electrical installation before he/she commences with the electrical testing. These currents normally flow harmlessly through the power cord grounding conductor.

Earth leakage current is the current that normally flows in the earth conductor of a protectively earthed piece of equipment. The 18 th Edition now makes it clear; the accumulation of circuit protector currents/earth leakage currents that are present during normal operating conditions shall not be more than 30% of the rated residual operating current of the RCD e.g. TOUCH AND LEAKAGE CURRENT LIMITS The term leakage current refers to currents, not intended to be applied to the patient, that flow from exposed conductive portions of a device to ground (earth). Leakage current is the sum of all ac currents from mains conductors to ground through these resistances and impedances: the insulation resistance, the capacitive reactance across the insulation resistance, the capacitive reactance (impedance) of the Y capacitors. An Earth-leakage circuit breaker (ELCB) is a safety device used in electrical installations with high Earth impedance to prevent shock. The leakage current test requires cord and plug-connected appliances to comply with the maximum leakage current requirements under foreseeable conditions for which a product may be subjected. This can cause an electric shock by simply touching exposed metal parts if the earth becomes disconnected. It may be necessary to make up a special lead with the earth wire separated from the other wires. Maximum Leakage Current: II Ungrounded: All: 0.25mA: I Grounded: Hand-held: 0.75mA : I Grounded: Movablebv(Not hand-held) 3.5mA: I Grounded: Stationary, Type A: 3.5mA: Table 4: Some UL Values for Leakage Current Limits. Because the insulation resistance and reactance of the stray capacitance is so high, the ac test current can be simplified to the leakage current at 250 V times the ratio of hi-pot test voltage to 250 V. If the test voltage is 3000, then the test current would be 3000/250 x 0.5 or 6 mA. Leakage current is the current that flows from the unit through the grounding conductor into a household ground. To get an accurate value of the leakage current, it is advisable to measure the current that flows to the ground when the filter is in operation. The maximum acceptable limit of a leakage current is generally 210 micro amperes. That's why GFCI breaker manufacturers recommend one-way feeder length be limited to 250 feet, maximum.