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Electric wiring in Republic of South Korea #139288
10/27/03 03:50 PM
10/27/03 03:50 PM
S
SvenNYC  Offline OP
Member
Joined: Aug 2002
Posts: 1,691
New York City
This is from a ROK resident and contributor to Usenet newsgroup rec.antiques.radio+phono.

She posted these pictures and text about wiring methods in that country and gave me permission to copy the post here. Sorry for the sideways picture of the 5KW portable transformer and the utility pole.

=======================
Brenda Ann said:

Someone asked me to post something like these.. so here they are

[Linked Image]

shows our 220 volt AC 60 Hz drop. Yes, those are approximately 9AWG wires that are spliced into the drop, and feed 6 apartments of this building, plus negligible hallway and porch lighting. Can you say fire hazard?? I knew you
could!!!

[Linked Image]

shows the single high tension wire feeding the system running about a meter below the top of the pole. The wire running on top is the other leg, which is below the top of the pole. The wire running on top is the other leg, which is also loosely connected to ground (lightning protection) via the concrete and steel reinforced pole (all of them are like that). Note that the "hot" wire runs down to the pole pig, whereas the "ground" wire runs down the pole, and is tapped off to the pole pig. NOTE!!: There is NO GROUND and NO Neutral on the drop itself!! These do not exist inside the buildings here!!

To drop 220 down to 110, to run the various US market appliances available here, they use autotransformers of various sizes, up to 5KVA (a very loose interpretation thereof... the 5KVA autotransformers are no larger than a good 20 amp 12 volt power supply is in the states... one is pictured below:

[Linked Image]

Also, only one line is switched for any reason, which means that always one line of the mains is hot to earth ground (either by leakage or by direct connection, depending upon how the pole pig is wired)...

[This message has been edited by SvenNYC (edited 10-27-2003).]

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Re: Electric wiring in Republic of South Korea #139289
10/27/03 04:06 PM
10/27/03 04:06 PM
C
C-H  Offline
Member
Joined: Sep 2002
Posts: 1,497
Stockholm, Sweden
Sven,

the account with the pictures got locked since it doesn't allow linking from the outside!

I suggest you download them and put them on an account that allows linking.

Re: Electric wiring in Republic of South Korea #139290
10/27/03 04:08 PM
10/27/03 04:08 PM
W
wa2ise  Offline
Member
Joined: Nov 2002
Posts: 785
Oradell NJ USA
BTW, geocities won't let you access a jpg on their servers directly. But there is a work around: highlight the url in the line where you would type in a url to browse it (Netscape). Then hit "return". This tricks geocities into letting you see the picture.

Re: Electric wiring in Republic of South Korea #139291
10/27/03 04:10 PM
10/27/03 04:10 PM
S
SvenNYC  Offline OP
Member
Joined: Aug 2002
Posts: 1,691
New York City
C-H: Yeah, I noticed that the pics weren't coming up and so I put the URLS right next to it so you could go directly to them.

Let me figure something out....but that was the best I could do at the time. [Linked Image]

Re: Electric wiring in Republic of South Korea #139292
10/27/03 04:45 PM
10/27/03 04:45 PM
S
SvenNYC  Offline OP
Member
Joined: Aug 2002
Posts: 1,691
New York City
OK, fixed. We grabbed the pics, put them on my website and linked to that. And rotated. [Linked Image]

I HATE Geocities!!

Re: Electric wiring in Republic of South Korea #139293
10/27/03 05:37 PM
10/27/03 05:37 PM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Certainly some, er, interesting wiring.

The HV neutral run at the top of the pole with the hot line below it looks weird.

Re: Electric wiring in Republic of South Korea #139294
10/27/03 10:36 PM
10/27/03 10:36 PM
W
wa2ise  Offline
Member
Joined: Nov 2002
Posts: 785
Oradell NJ USA
pauluk
Quote
The HV neutral run at the top of the pole with the hot line below it looks weird.


Maybe they want lightning to head for the neutral (ground?) instead of the hot distribution wire.

Re: Electric wiring in Republic of South Korea #139295
10/31/03 09:07 PM
10/31/03 09:07 PM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
The wire at the top of the pole is called an Umbrella wire.
It's used to keep lightning strikes away from the HV wire, which if struck, would cause all manner of problems.
But, I notice the small distance between the HV dropper and the Grounding wire that heads down the pole, it's a wonder that there is not an arcing-over problem there!. [Linked Image]

Re: Electric wiring in Republic of South Korea #139296
11/01/03 06:01 AM
11/01/03 06:01 AM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Good point about lightning.

Do we know what voltage is on the incoming HV line here?

Re: Electric wiring in Republic of South Korea #139297
11/01/03 06:18 AM
11/01/03 06:18 AM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Paul, my best guess would be that this is either a 10 or 15kV line.
The reason I say this is because the Xformer is an ABB Type 35-10, used ages ago and are quite rare now!.
BTW, the insulators on the line/crossarm contact point and the Primary fuse are a bit too small for my liking.
They also look like they are made of metal?!.
Glad we don't have cross-arms like that over here, us Line Mechanics stand up on them. [Linked Image]

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