ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Recent Posts
Old Computers?
by gfretwell - 11/21/23 03:45 PM
Simplify MOSFET Test With Source Measure Meter
by gfretwell - 11/18/23 09:20 PM
Ontario Electrical Safety Report
by Admin - 11/02/23 08:56 PM
How are you Jersey folks about the windmills?
by HotLine1 - 11/01/23 07:47 AM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
1 members (Scott35), 18 guests, and 20 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Aug 2008
Posts: 62
andey Offline OP
Hi Forum,

anyone knows about Japanese electrical?
They have 100V standard outlets, often 2-pole only.
And 200V outlets, 3-pole.

I need to know if GFCI, RCD etc. are used for the 200V 15A or not.
And if yes, what trip current is usual.

I need to send an industrial device down there with some leakage current from the line filters. Need to evaluate if it will work or not.

Any ideas?

Last edited by andey; 10/20/21 07:11 AM.
Joined: Jul 2002
Posts: 8,443
Likes: 3
Hi Andreas,
Japan is a funny place, voltage-wise, in that it uses a 100/200VAC local distrbution system, 100VAC is the
single phase voltage and 200VAC is the 3-Phase Star based system.

Let me quote this:
Frequency is either 50Hz (east Japan including Tokyo, Sendai and Sapporo)
or 60Hz (west Japan including Nagoya, Osaka, Takamatsu, Hiroshima, Fukuoka, Naha),
depending on power companies.

# For home appliances
: Single-phase 3-wire,
100V (using live and neutral wires) / 200V (using live and live wires).
: Most home appliances are designed only for 100V.
# For factory uses
: 3-phase 3-wire, 200V.

So we have 3 phase, 3 wire, which suggests Delta?
Or it could be 2 phases plus a neutral at 180° wired as Star.

What sort of equipment is this?
Does it matter if the frequency of the supply is 50 or 60 Hz?

I look forward to your reply.

Mike T.

Joined: Dec 2001
Posts: 2,498
A third option is star with no neutral supplied to the load, which was once a common system in many European countries, 127/220 V. The centre point of the transformer was earthed but the distribution network had no neutral or PEN conductor, resulting in a TT system. Berlin had a 127/220 V TN-S system.

Most single-phase loads don't care about the supply arrangement as long as the potential difference is right, so apart from fusing and switching it doesn't matter whether you have one line and one neutral conductor or two lines.

Link Copied to Clipboard

Tools for Electricians
Tools for Electricians

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC + Exam Prep Study Guides Now Available!
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
Portland, Oregon, United States
Posts: 404
Joined: March 2007
Top Posters(30 Days)
Admin 1
Popular Topics(Views)
313,166 Are you busy
239,117 Re: Forum
222,880 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5