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| Kiwi John 2005-08-22, 7:21 am |
| I have a shed in outback aussie it uses a genny mainly
but there seems to be no earth coming off any of the rails in the switch box
shouldn't there be an earth coming off the neutral rail to a bar in the
ground
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| barry@sme-online.com 2005-08-22, 12:21 pm |
| There may be (4) major connections:
(2) phase leads (110/220v)
(1) neutral to center-tap of winding with the (2) phase leads
(1) ground (frame/chassis/whatever)
Per some codes, you'd need one and only one connection (bonding) of
neutral to ground, at service entrance. Which in your case could be
the generator panel.
Dunno what "mainly" means. Maybe you have neutral grounded at service
entrance/transfer switch?
Have you asked of the mfg. or local authorities? Or of knowledgeable
mate?
HTH,
J
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| GeekBoy 2005-08-22, 3:21 pm |
|
<barry@sme-online.com> wrote in message
news:1124720649.928972.84360@o13g2000cwo.googlegroups.com...
> There may be (4) major connections:
> (2) phase leads (110/220v)
> (1) neutral to center-tap of winding with the (2) phase leads
> (1) ground (frame/chassis/whatever)
>
> Per some codes, you'd need one and only one connection (bonding) of
> neutral to ground, at service entrance. Which in your case could be
> the generator panel.
>
> Dunno what "mainly" means. Maybe you have neutral grounded at service
> entrance/transfer switch?
Main Entry: main·ly
Pronunciation: 'mAn-lE
Function: adverb
1 obsolete : in a forceful manner
2 : for the most part : CHIEFLY
I am sure he is refering to definition #2
>
> Have you asked of the mfg. or local authorities? Or of knowledgeable
> mate?
>
> HTH,
> J
>
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| barry@sme-online.com 2005-08-22, 5:21 pm |
| Not sure at all what John meant, and this sort of thing doesn't lend
itself to guessing- too much potentially at risk.
Thus the suggestion to seek local answer.
TTFN,
J
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| Roger_Nickel 2005-08-22, 7:21 pm |
| Kiwi John wrote:
> I have a shed in outback aussie it uses a genny mainly
>
> but there seems to be no earth coming off any of the rails in the switch box
> shouldn't there be an earth coming off the neutral rail to a bar in the
> ground
>
>
Same regulations as NZ. There are seperate nuetral and earth
busbars on the switchboard. The customers' earth stake is
connected to the earth bus. The nuetral and earth busbars are
connected (only) by a removeable link on the switchboard. In a
mains system, the lines company nuetral feed is earthed back at
the transformer, and with the link on the customer switchboard
removed there should be a low resistance between the nuetral and
earth busbars.
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| Roger_Nickel 2005-08-22, 9:21 pm |
| Roger_Nickel wrote:
> Kiwi John wrote:
>
> Same regulations as NZ. There are seperate nuetral and earth busbars on
> the switchboard. The customers' earth stake is connected to the earth
> bus. The nuetral and earth busbars are connected (only) by a removeable
> link on the switchboard. In a mains system, the lines company nuetral
> feed is earthed back at the transformer, and with the link on the
> customer switchboard removed there should be a low resistance between
> the nuetral and earth busbars.
I should have mentioned--be carefull if you unlink the the N and E
buses on the switchboard with the power on; check immediately for
voltage drop between the busses when you remove the link. Anything
more than 15 volts or so is cause for concern. A faulty customer
earth and an earth leakage fault on one appliance could raise
exposed metalwork throughout the installation to mains voltage
resulting in nasty and possibly dangerous shocks when N & E are
unlinked. shocks due to an interchanged nuetral and earth
connection anywhere in the system could be fatal under these
circumstances. Best to remove the link with power off and only
power up when you want to make measurements. Electricians use a
special high current pulse tester to measure N/E resistance but a
quick and dirty measurement is to connect a 200 Watt light bulb
between phase and earth anywhere in the system with the N and E
busses unlinked. The bulb should light at full brilliance and
voltage between the E & N at the switchboard should still be under
15 volts or so. If not, then you need an electrician. If AU regs
are the same as NZ then work on the switchboard and on the
installation earth has to be done by a registered electrician,
especially if you want to keep your insurance cover.
| |
| John G 2005-08-22, 9:21 pm |
|
"Roger_Nickel" <rnickel@x.co.nz> wrote in message
news:430a5fc8@news2.actrix.gen.nz...
> Roger_Nickel wrote:
> I should have mentioned--be carefull if you unlink the the N and E
> buses on the switchboard with the power on; check immediately for
> voltage drop between the busses when you remove the link. Anything
> more than 15 volts or so is cause for concern. A faulty customer earth
> and an earth leakage fault on one appliance could raise exposed
> metalwork throughout the installation to mains voltage resulting in
> nasty and possibly dangerous shocks when N & E are unlinked. shocks
> due to an interchanged nuetral and earth connection anywhere in the
> system could be fatal under these circumstances. Best to remove the
> link with power off and only power up when you want to make
> measurements. Electricians use a special high current pulse tester to
> measure N/E resistance but a quick and dirty measurement is to connect
> a 200 Watt light bulb between phase and earth anywhere in the system
> with the N and E busses unlinked. The bulb should light at full
> brilliance and voltage between the E & N at the switchboard should
> still be under 15 volts or so. If not, then you need an electrician.
> If AU regs are the same as NZ then work on the switchboard and on the
> installation earth has to be done by a registered electrician,
> especially if you want to keep your insurance cover.
In Aus work on ANY panel connected to the supply system MUST be by
licensed Eleco and he should understand what is required.
As has been said already there is really not enough information in a
short message to give good advice.
--
John G
Wot's Your Real Problem?
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| Kiwi John 2005-08-22, 11:21 pm |
| no I mainly use a generator but sometimes switch or to solar as theres no
grid supply
yea na theres no earth in the system so i guess i beter get me a stake
and shove one in
"GeekBoy" <GeekBoy@Geeks.com> wrote in message
news:1124733860.8e3ccf42da4f4c06f13a12dfa0049ca1@teranews...
>
> <barry@sme-online.com> wrote in message
> news:1124720649.928972.84360@o13g2000cwo.googlegroups.com...
>
> Main Entry: main·ly
> Pronunciation: 'mAn-lE
> Function: adverb
> 1 obsolete : in a forceful manner
> 2 : for the most part : CHIEFLY
>
> I am sure he is refering to definition #2
>
>
>
>
>
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| Kiwi John 2005-08-22, 11:21 pm |
| shit mate out here ya cant buy a bloody pie let alone get a sparky that
would take till about the end of November at the moment
and a plumber even worse
so ya just gotta do it yourself
"John G" <Greentest@ozemail.com.au> wrote in message
news:430a6493$0$5449$5a62ac22@per-qv1-newsreader-01.iinet.net.au...
>
> "Roger_Nickel" <rnickel@x.co.nz> wrote in message
> news:430a5fc8@news2.actrix.gen.nz...
>
> In Aus work on ANY panel connected to the supply system MUST be by
> licensed Eleco and he should understand what is required.
> As has been said already there is really not enough information in a
> short message to give good advice.
> --
> John G
>
> Wot's Your Real Problem?
>
>
| |
| John G 2005-08-23, 1:21 am |
|
"Kiwi John" <le_angel@hotmail.com> wrote in message
news:430a85bb@dnews.tpgi.com.au...
> shit mate out here ya cant buy a bloody pie let alone get a sparky
> that would take till about the end of November at the moment
>
> and a plumber even worse
>
> so ya just gotta do it yourself
>
>
Yeh! Understand that but just for the foreigners from north of the
equator I put the record as it is.
Lived in The Alice for some years in another life.
As you are only on gennie and solar you only have to get authority from
above for what ever you do but still you need to understand the risks
and not kill yourself.
--
John G
Wot's Your Real Problem?
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