Hi folks!
Please, check my logic. Here is well known schematic of usage AC-DC SMPS (for example, PC):
see attachment
L – phase wire, N – neutral wire, G – protective Earth.
This scheme is actual for Europe. I don’t know how about US.
I’m in confusing with three questions:
1) Y-capacitors don’t works well – do not suppress symmetrical interference (suppress, but high-frequency only). And only one of them works in low-frequency.
2) Shorts N to G cannot be detected by 1-pole circuit breaker. Returning current will flow thought shorts N+G.
3) N-wire break cannot be detected. Power Supply will works on G-wire until it burn down.
4) A vast of devices have direct connection between secondary (low-voltage) GND and G. What happens if G-path will has lower resistance than N? Power current will flow through G-wire, nor through N. The path of this current will unpredictable.
Am I right?
I’m not a native English speaker, please tell me in simple English. Thanks.
Please, check my logic. Here is well known schematic of usage AC-DC SMPS (for example, PC):
see attachment
L – phase wire, N – neutral wire, G – protective Earth.
This scheme is actual for Europe. I don’t know how about US.
I’m in confusing with three questions:
1) Y-capacitors don’t works well – do not suppress symmetrical interference (suppress, but high-frequency only). And only one of them works in low-frequency.
2) Shorts N to G cannot be detected by 1-pole circuit breaker. Returning current will flow thought shorts N+G.
3) N-wire break cannot be detected. Power Supply will works on G-wire until it burn down.
4) A vast of devices have direct connection between secondary (low-voltage) GND and G. What happens if G-path will has lower resistance than N? Power current will flow through G-wire, nor through N. The path of this current will unpredictable.
Am I right?
I’m not a native English speaker, please tell me in simple English. Thanks.
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