AS IEC 60990:2018 pdf free

AS IEC 60990:2018 pdf free.Methods of measurement of touch current and protective conductor current
Three-phase EQUIPMENT shall be connected to a three-phase star power distribution system,with earthed neutral. Single-phase EQUIPMENT shall be connected between phase and neutral of an earthed neutral power distribution system or, where specified by the manufacturer to operate in such a manner, line-to-line on a centre-earthed three-phase star power distribution system (see Figure 6, Figure 8 and Figure 11).
Three-phase EQUIPMENT shall be connected to an appropriate three-phase IT power supply system. Single-phase EQUIPMENT shall be connected between phase and neutral or, where specified by the manufacturer to operate in such a manner, line-to-line (see Figure 9,Figure 10, Figure 12 and Figure 13).
Product committees may wish to exclude measurement of TOUCH CURRENT at some accessible parts,based upon the principle of limitation of voltage (see IEC 60364-4-41). If so,measurements shall be made for accessible voltage and then, if required, for weighted or unweighted TOUCH CURRENT according to Clause 6.
Concern for ELECTRIC BURN effects may arise with d.c. or at high frequencies (for example,above 30 kHz for 3,5 mA TOUCH CURRENT). At lower frequencies, startle-reaction and letgo-immobilization will be the dominant considerations. Where there is such a concern, the unweighted r.m.s. value of TOUCH CURRENT shall be measured (Figure 3),in addition to measurement for either startle-reaction (Figure 4), or inability to let go (Figure 5).
Control switches e, g,I, n and p in Figure 6 to Figure 14 shall be manipulated as described in 6.2, while the conditions listed in this subclause and 6.2.1 are independently varied so as to give the maximum measured value or values. Product committees shall make an appropriate selection of these variables.
Recent addition of ABNORMAL OPERATION as an operating condition in product standards as related to the electrical installation (e.g. the loss of PE or the inability to ensure polarity of supply) clarifies the test conditions under NORMAL operation and FAULT CONDITIONS to then be applied.AS IEC 60990 pdf free download.