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Home with NO Ground in Electrical Installation
Home with NO Ground in Electrical Installation
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Old 20th December 2017, 08:46 PM   #1
FullRangeMan is offline FullRangeMan  Brazil
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Default Home with NO Ground in Electrical Installation

Hi all,
My home electrical installation does not have grounding, its bi-phase 220V (127V + 127V). What kind of grounding should my tube amp have?
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Old 20th December 2017, 08:57 PM   #2
rayma is offline rayma  United States
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The power center tap is still normally grounded.
Split-phase electric power - Wikipedia
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Old 20th December 2017, 09:22 PM   #3
FullRangeMan is offline FullRangeMan  Brazil
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Do you mean say the condo transformer is grounded? Its a 225KVA, input in 13800V output is RTF 127V x3.
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Old 20th December 2017, 09:25 PM   #4
kodabmx is offline kodabmx  Canada
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Here it's 27kv6 to 208 Three phase. 120V phase to neutral, 208 phase to phase.
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Old 20th December 2017, 09:27 PM   #5
rayma is offline rayma  United States
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Quote:
Originally Posted by FullRangeMan View Post
Do you mean say the condo transformer is grounded? Its a 225KVA, input in 13800V output is RTF 127V x3.
Apparently, in Brazil, there are many variations used, so I would consult a local electrician,
for safety. Even if you have three phase power, some systems do have the center grounded,
unless it's a delta system, where there is no center to tap.

Last edited by rayma; 20th December 2017 at 09:37 PM.
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Old 20th December 2017, 09:32 PM   #6
leadbelly is offline leadbelly  Canada
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Home with NO Ground in Electrical Installation
Quote:
Originally Posted by kodabmx View Post
Here it's 27kv6 to 208 Three phase. 120V phase to neutral, 208 phase to phase.
Where? I doubt any residence in Canada is like that. AFAIK it's all single phase 240V in residential areas.
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Old 20th December 2017, 09:40 PM   #7
kodabmx is offline kodabmx  Canada
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Nope. Most appartment buildings in at least the Toronto area of any appreciable size (my building has almost 300 units) are supplied with 27.6kV to 208 three phase/120V neutral. They even have special stoves that are designed for 208V instead of 240V. I have one.


EDIT: My building is also heated electrically.
EDIT2: no stand alone homes are powered like this, they all receive 240V split phase.

Last edited by kodabmx; 20th December 2017 at 09:43 PM.
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Old 20th December 2017, 09:47 PM   #8
petertub is offline petertub  Sweden
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Quote:
Originally Posted by FullRangeMan View Post
Hi all,
My home electrical installation does not have grounding, its bi-phase 220V (127V + 127V).
What kind of grounding should my tube amp have?
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.
If this distribution connect is addition can be grounded is a plus. You might have a suitable ground around : possible sources :
water filled oom heaters supplied from a central source,
cable-tv screen,
if living on ground floor: a steel or metal pole stuck at least 1 meter down
tap water tube, often made by copper and well grounded
etc
but don't use any lightning arrestors !!

But as you electrical system is symmetrical around ground zero, chances are that your connected chassies are very close to zero. Interconnection of all devices will make the most effect.
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Old 20th December 2017, 10:05 PM   #9
kodabmx is offline kodabmx  Canada
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Quote:
Originally Posted by FullRangeMan View Post
Hi all,
My home electrical installation does not have grounding, its bi-phase 220V (127V + 127V). What kind of grounding should my tube amp have?
In North America that 0V (neutral) is connect to ground (Earth).
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Old 20th December 2017, 10:54 PM   #10
Shef is offline Shef
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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.
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