W
william_N
Hi All,
is anybody familiar with IEC61010-1? I am reading this standard and get some confusing about the insulation requirements.
Requirements for insulation in particular types of circuits are specified as follows:
a) in 6.7.2 for MAINS CIRCUITS of OVERVOLTAGE CATEGORY II with a nominal supply voltage up to 300 V;
b) in 6.7.3 for secondary circuits separated from the circuits in a) only by means of a transformer;
c) in K.1 for MAINS CIRCUITS of OVERVOLTAGE CATEGORY III or IV or for OVERVOLTAGE CATEGORY II over 300 V;
d) in K.2 for secondary circuits separated from the circuits in c) only by means of a transformer
e) in K.3 for circuits that have one or more of the following characteristics:
1) the maximum possible TRANSIENT OVERVOLTAGE is limited by the supply source or within the equipment to a known level below the level assumed for the MAINS CIRCUIT;
2) the maximum possible TRANSIENT OVERVOLTAGE is above the level assumed for the MAINS CIRCUIT;
3) the WORKING VOLTAGE is the sum of voltages from more than one circuit, or is a mixed voltage;
4) the WORKING VOLTAGE includes a recurring peak voltage that may include a periodic non-sinusoidal waveform or a non-periodic waveform that occurs with some regularity;
5) the WORKING VOLTAGE has a frequency above 30 kHz.
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sorry for the big copy.
1. what's the meaning of "the WORKING VOLTAGE is the sum of voltages from more than one circuit, or is a mixed voltage"?
2. when I find evidance according to "the WORKING VOLTAGE includes a recurring peak voltage that may include a periodic non-sinusoidal waveform or a non-periodic waveform that occurs with some regularity" between pri. and sec. of a SMPS, find that the clearance requirements for a peak working voltage 500V/up to 30kHz is only 0.04mm. Is it my misunderstanding? if so, shall I use "in 6.7.2 for MAINS CIRCUITS of OVERVOLTAGE CATEGORY II with a nominal supply voltage up to 300 V“？
Hope somebody can explain this?
very thanks
is anybody familiar with IEC61010-1? I am reading this standard and get some confusing about the insulation requirements.
Requirements for insulation in particular types of circuits are specified as follows:
a) in 6.7.2 for MAINS CIRCUITS of OVERVOLTAGE CATEGORY II with a nominal supply voltage up to 300 V;
b) in 6.7.3 for secondary circuits separated from the circuits in a) only by means of a transformer;
c) in K.1 for MAINS CIRCUITS of OVERVOLTAGE CATEGORY III or IV or for OVERVOLTAGE CATEGORY II over 300 V;
d) in K.2 for secondary circuits separated from the circuits in c) only by means of a transformer
e) in K.3 for circuits that have one or more of the following characteristics:
1) the maximum possible TRANSIENT OVERVOLTAGE is limited by the supply source or within the equipment to a known level below the level assumed for the MAINS CIRCUIT;
2) the maximum possible TRANSIENT OVERVOLTAGE is above the level assumed for the MAINS CIRCUIT;
3) the WORKING VOLTAGE is the sum of voltages from more than one circuit, or is a mixed voltage;
4) the WORKING VOLTAGE includes a recurring peak voltage that may include a periodic non-sinusoidal waveform or a non-periodic waveform that occurs with some regularity;
5) the WORKING VOLTAGE has a frequency above 30 kHz.
---------------------------------------------------------------------
sorry for the big copy.
1. what's the meaning of "the WORKING VOLTAGE is the sum of voltages from more than one circuit, or is a mixed voltage"?
2. when I find evidance according to "the WORKING VOLTAGE includes a recurring peak voltage that may include a periodic non-sinusoidal waveform or a non-periodic waveform that occurs with some regularity" between pri. and sec. of a SMPS, find that the clearance requirements for a peak working voltage 500V/up to 30kHz is only 0.04mm. Is it my misunderstanding? if so, shall I use "in 6.7.2 for MAINS CIRCUITS of OVERVOLTAGE CATEGORY II with a nominal supply voltage up to 300 V“？
Hope somebody can explain this?
very thanks
