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What are the differences in number of conductors between single phase and the 3 phase used in China as compared with what is used in the U.S.A.?
It's my understanding that 220v residential is strictly a single hot and a neutral. Is their line 220v on a single leg? I've got some Chinese equipment to wire and it appears that have 1 leg hot in their equipment while the other leg on the 220v breaker is tied to the neutral.

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  • \$\begingroup\$ What does the manual say? Electrical schematics? \$\endgroup\$
    – Transistor
    Aug 19 '19 at 21:48
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    \$\begingroup\$ In the USA, 220 V, probably more properly called 240 V, is 2 hot lines and often a neutral. Each hot line is 120 V to neutral. There must also be an equipment grounding conductor that is connected to earth at the service entrance where the neutral is also connected to earth. Equipment that requires only 220 V can be connected without connecting the neutral. \$\endgroup\$ Aug 19 '19 at 22:28
  • \$\begingroup\$ Thank you but, not helpful at all. I know what we have in the U.S.A.. been dealing with everything from 5vdc to 480 3 phase for over 40 yrs. \$\endgroup\$ Aug 19 '19 at 23:26
  • \$\begingroup\$ All schematics are in Chinese and none of the symbols are remotely close to what we are used to. \$\endgroup\$ Aug 19 '19 at 23:27
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    \$\begingroup\$ An understanding of 220 V residential in China is of very doubtful value. If you are worried that the equipment neutral might be connected to the metal structure of the equipment, check it. If you think the neutral-connected part of the live circuit might not be good for 120 volts to ground, that is essentially a suspicion that the equipment is junk. I don't think any of us can prove or disprove that. \$\endgroup\$ Aug 20 '19 at 1:22
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China is similar to most of the EU. Phase-to-phase voltage for 3-phase is 380V 50Hz; Phase-to-neutral is 220V. Wye (4 conductor) and delta (three conductor) are supported; for a residence it would always include a neutral.

The standard single-phase wall plug has one 220V hot and a neutral, and optionally a safety ground.

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  • \$\begingroup\$ There are three common types of wall plugs in China, but all fit within your description. \$\endgroup\$ Aug 20 '19 at 21:04
  • \$\begingroup\$ The European utility companies switched to 400V phase–phase voltages 30 years ago or so. \$\endgroup\$
    – Janka
    Aug 20 '19 at 21:42
  • \$\begingroup\$ The Q is about the wiring configuration, not the exact voltage. Yes, EU is 400Y230V, which is 'similar' to 380Y220. Reference list here: worldstandards.eu/three-phase-electric-power \$\endgroup\$ Aug 20 '19 at 22:23

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