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Home with NO Ground in Electrical Installation
Home with NO Ground in Electrical Installation
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Old 21st December 2017, 12:07 AM   #11
Pano is offline Pano  United States
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Home with NO Ground in Electrical Installation
For years I lived with split phase, no ground in France. There isn't much you can do if you can't make your own ground. You just have to live without, like our ancestors did.
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Old 21st December 2017, 12:36 AM   #12
FullRangeMan is offline FullRangeMan  Brazil
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Quote:
Originally Posted by Shef View Post
You could use an isolating transformer for the 127-0-127 wiring, like some 600-1000VA toroid, connect it any way you want. IMO it also gives a bit of filtering from power line's noise.
I already used a 220V-120V 4.5kg stepdown Toroidal to the CD player for some time, when I removed it the sound quality increased instantly.
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Old 21st December 2017, 12:37 AM   #13
PRR is offline PRR  United States
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Gentlebeings--

We have been through this before. This is NOT the power systems used in the US/Can, or the UK.... many systems are possible and Brazil is known to use several of them.

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Originally Posted by FullRangeMan View Post
...does not have grounding, its bi-phase 220V (127V + 127V).....
Normally the metal shell of your clothes washer, and metal switch-covers, returns to a Protective Earth from the power company. Do you have that?
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Old 21st December 2017, 12:53 AM   #14
Pano is offline Pano  United States
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Home with NO Ground in Electrical Installation
Yes. Metal water pipe has served me well in places with no ground wire.
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Old 21st December 2017, 12:55 AM   #15
FullRangeMan is offline FullRangeMan  Brazil
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Originally Posted by petertub View Post
Connecting all device chassies together will cut all leakage currents, can be done with grounded ( 3 prong) cables connected to a 3-prong distribution connector. <snip>
Currently buildings have 3 pins (phase neutral ground to 127V or phase phase ground to 220V), but my condo is not this time.

The electric shower tap gave shock, then I solved the problem with a PVC pipe from shower to wall.
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Old 21st December 2017, 05:45 AM   #16
PRR is offline PRR  United States
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Quote:
Originally Posted by Pano View Post
Metal water pipe has served me well....
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Originally Posted by FullRangeMan View Post
...The electric shower tap gave shock, then I solved the problem with a PVC pipe from shower to wall.
He's getting shocked *by the water pipe*!

Connecting hi-fi chassis to this piping may be VERY DANGEROUS.

I wonder if you have a breakdown in the insulation of the electric shower.

I really think you should consult Expert Local Advice, not some hi-fi geeks 3000+ miles away who have never seen an electric supply such as yours.
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Old 21st December 2017, 06:33 AM   #17
leadbelly is offline leadbelly  Canada
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Home with NO Ground in Electrical Installation
I would agree that it would be best to check with a local expert, but would not be surprised if the answer was "that's what it is". 2 prong 240V was normal not too long ago. My grandparents home in Italy is still wired that way, albeit uninhabited and eligible for free upgrade from the utility.

So if you have to make do with what you have, you need to look at things like GFCI and/or double insulated design techniques for peace of mind with your DIY projects.
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Old 21st December 2017, 04:43 PM   #18
FullRangeMan is offline FullRangeMan  Brazil
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Quote:
Originally Posted by PRR View Post
Gentlebeings--

We have been through this before. This is NOT the power systems used in the US/Can, or the UK.... many systems are possible and Brazil is known to use several of them.



Normally the metal shell of your clothes washer, and metal switch-covers, returns to a Protective Earth from the power company. Do you have that?
All power outlets in my apto have only 2 phases wires.
Afew years ago I was using an aluminium window as ground as it near the system.

Quote:
Originally Posted by leadbelly View Post
I would agree that it would be best to check with a local expert, but would not be surprised if the answer was "that's what it is". 2 prong 240V was normal not too long ago. My grandparents home in Italy is still wired that way, albeit uninhabited and eligible for free upgrade from the utility.

So if you have to make do with what you have, you need to look at things like GFCI and/or double insulated design techniques for peace of mind with your DIY projects.
YOU RIGHT Here the situation is very bad, carpenters, locksmiths and electricians can not spell the alphabet.

Usually are unreliable people, especially if the client does not know the subject.

So Returning to the original question:

What grounding type/schema my tube amp should have?
Having groundless outlets on home.
Thanks for help
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Old 22nd December 2017, 12:38 AM   #19
Speedskater is offline Speedskater  United States
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It seems that the two different common grounding systems are getting co-mingled again.
a] The Safety Ground/Protective Earth system. It's main task is to trip a circuit breaker in the event of a ground fault (short circuit). Most large exposed metal objects should be bonded (permanent connect) to this system.
b] The connection to Planet Earth. It's there for safety 1] during thunderstorms 2] high voltage failures (like if a high voltage wire falls on a low voltage wire) 3] to keep the Neutral at about the same potential as the swimming pool or damp floor.

Note the the connection to Planet Earth has nothing to do with day-to-day AC power quality.
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Old 22nd December 2017, 01:57 AM   #20
Refugee1 is offline Refugee1  United Kingdom
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It is not one of these kind of showers by any chance. Shocks are common from them. The Latin American Suicide Shower - Argentina - WorldNomads.com
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