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'[PIC]: Newbie Q. re: electrical outlet and SSR'
2002\02\06@151708 by akieran

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Hi all.  Would someone please explain how to correctly connect
a PIC-driven solid state relay to control a three pronged AC
device?  Does it matter whether the white or black conductor is
interuppted by the SSR?  (I assume that the green one is an
earth ground.)

Is this correct?:


[From power cord]

AC grn---------------------------------------------`
                                                  |
                                                  |
AC blk -------------------------------- ===        |  [Switched
                                                  |  AC Socket]
                                              O---'

AC wht -----[~ SSR ~]----------------- ====


Andrew
akieranATureach.com


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2002\02\06@153259 by David VanHorn

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At 03:14 PM 2/6/02 -0500, Andrew Kieran wrote:
{Quote hidden}

Black is the "hot" lead, and is the one that you should interrupt.
In a series circuit, from an academic point of view, it does not matter,
but from a safety point of view, I should never be able to touch a white
wire that is hot. (loads of things violate this, but that's how it should be)

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2002\02\06@172156 by Sean Alcorn - Avion Sydney

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on 7/2/02 7:32 AM, David VanHorn at spam_OUTdvanhornTakeThisOuTspamCEDAR.NET wrote:

Hey Dave,

> Black is the "hot" lead, and is the one that you should interrupt.
> In a series circuit, from an academic point of view, it does not matter,
> but from a safety point of view, I should never be able to touch a white
> wire that is hot. (loads of things violate this, but that's how it should be)

As an Australian and too young to remember anything OTHER than a 3-wire MEN
system, I am curious about the US 3-wire system. Is the White leg
(equivalent to what we term a neutral, I assume) connected to Earth at some
point in the building's electrical system or is it floating?

ie; in a new building with 3-wire outlets throughout, is the white neutral
leg tied to earth back at the distribution board?

Also is the colour coding still Black, White and Green? The Green/Yellow
combination is not used?

I lived in Taiwan for about 8 years, and they STILL use what I assume to be
a copy of the OLD 2-wire US System - One white and one black. I can tell you
I never trusted either of those suckers and made sure there was a dual pole
isolation switch between me and the nearest power station at all times -
then checked with a meter just to be sure! :-)

Regards,

Sean

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2002\02\06@174431 by Martin Peach

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----- Original Message -----
From: "Sean Alcorn - Avion Sydney" <.....sdalcornKILLspamspam@spam@AVION.COM.AU>
To: <PICLISTspamKILLspamMITVMA.MIT.EDU>
Sent: Wednesday, February 06, 2002 5:20 PM
Subject: Re: [PIC]: Newbie Q. re: electrical outlet and SSR


> on 7/2/02 7:32 AM, David VanHorn at .....dvanhornKILLspamspam.....CEDAR.NET wrote:
>
> Hey Dave,
>
> > Black is the "hot" lead, and is the one that you should interrupt.
> > In a series circuit, from an academic point of view, it does not matter,
> > but from a safety point of view, I should never be able to touch a white
> > wire that is hot. (loads of things violate this, but that's how it
should be)
>
> As an Australian and too young to remember anything OTHER than a 3-wire
MEN
> system, I am curious about the US 3-wire system. Is the White leg
> (equivalent to what we term a neutral, I assume) connected to Earth at
some
> point in the building's electrical system or is it floating?
>
> ie; in a new building with 3-wire outlets throughout, is the white neutral
> leg tied to earth back at the distribution board?

Where I live in Quebec there are three wires coming off the transformer on
the utility pole. The earth wire is connected at the utility box with a fat
bare copper multistranded cable to the earth via the house plumbing or a
copper rod driven into the ground. I assume the white wire is grounded at
the pole, but it may just be the neutral side of a three-phase
transformer...dunno.

>
> Also is the colour coding still Black, White and Green? The Green/Yellow
> combination is not used?

I have never seen green/yellow except inside appliances like electric
lawn-mowers.

>
> I lived in Taiwan for about 8 years, and they STILL use what I assume to
be
> a copy of the OLD 2-wire US System - One white and one black. I can tell
you
> I never trusted either of those suckers and made sure there was a dual
pole
> isolation switch between me and the nearest power station at all times -
> then checked with a meter just to be sure! :-)

In my current apartment most of the wiring is cloth-covered and looks brown
but when it was installed about 50 years ago it may have been colour-coded.
I have seen in the basements of other peoples' houses the remains of the
original electrical system: two cloth-covered wires about a foot apart
running on ceramic insulators. No earth ground...

/\/\/\/*=Martin

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2002\02\06@180518 by Dwayne Reid

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At 09:20 AM 2/7/02 +1100, Sean Alcorn - Avion Sydney wrote:

>As an Australian and too young to remember anything OTHER than a 3-wire MEN
>system, I am curious about the US 3-wire system. Is the White leg
>(equivalent to what we term a neutral, I assume) connected to Earth at some
>point in the building's electrical system or is it floating?
>
>ie; in a new building with 3-wire outlets throughout, is the white neutral
>leg tied to earth back at the distribution board?

Yep - in 2 places (redundant): inside the meter box (usually on the outside
of the building) and inside the main disconnect (usually part of the main
breaker panel).  The meter box earth - neutral connection is accomplished
by stripping the insulation from the neutral conductor and clamping under a
robust ground clamp.  The main disconnect accomplishes the same thing by
having a screw connect the neutral bar to the case.  The neat thing about
the meter box neutral ground is that you don't cut the neutral in order to
ground it; in fact, the neutral must be a continuous (no splices) conductor
from the service connection to the disconnect.  The bonding screw inside
the disconnect is removable for those cases where the panel is used as a
sub-panel being fed the main panel but must NOT be removed if the panel is
in fact the main panel.

>Also is the colour coding still Black, White and Green? The Green/Yellow
>combination is not used?

I'm now starting to see green / yellow wire instead of solid green in
modern line cords.  In addition, when we build and wire racks to be used in
industrial plants, we are allowed to use green / yellow in place of solid
green.  I assume (but don't know for a fact) that at some point all ground
conductors with insulation will be green / yellow.

dwayne


Dwayne Reid   <EraseMEdwaynerspam_OUTspamTakeThisOuTplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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2002\02\06@181948 by Sean Alcorn - Avion Sydney

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on 7/2/02 9:49 AM, Dwayne Reid at dwaynerspamspam_OUTPLANET.EON.NET wrote:

Hey Dwayne,

Thank you for a very detailed answer.

Cheers,

Sean

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