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Home > Archive > Electrical code Compliance > July 2005 > Neutral conductor for timer motor
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Neutral conductor for timer motor
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| Stephen J. Beyers 2005-07-09, 12:25 pm |
| The water source for my lawn-sprinkling system is a 240V
pump, controlled by a timer, which is driven by a 120V
motor. The pump is fed by a dedicated 240V branch circuit,
which has two hot wires and a bare safety ground wire, but
no white current-carrying neutral. One of the hot wires of
the 240V circuit feeds the 120V timer motor, so that the
timer will be shut off when the 240V supply to the pump is
shut off.
To avoid using the bare safety ground as a return path for
the 120V timer motor, a white current-carrying neutral comes
from the white neutral wire in a junction box for a separate
120V branch circuit, which happens to be located near the
timer. Is this a legitimate way to feed the timer motor?
Steve
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| phil-news-nospam@ipal.net 2005-07-11, 11:25 pm |
| On Sat, 9 Jul 2005 08:09:51 -0500 Stephen J. Beyers <sjbeyers@shawneelink.net> wrote:
| The water source for my lawn-sprinkling system is a 240V
| pump, controlled by a timer, which is driven by a 120V
| motor. The pump is fed by a dedicated 240V branch circuit,
| which has two hot wires and a bare safety ground wire, but
| no white current-carrying neutral. One of the hot wires of
| the 240V circuit feeds the 120V timer motor, so that the
| timer will be shut off when the 240V supply to the pump is
| shut off.
|
| To avoid using the bare safety ground as a return path for
| the 120V timer motor, a white current-carrying neutral comes
| from the white neutral wire in a junction box for a separate
| 120V branch circuit, which happens to be located near the
| timer. Is this a legitimate way to feed the timer motor?
No. The neutral conductor for the timer must be part of the same
circuit as, and run along with, the hot wire it is connected to
across the load (timer).
Maybe you can find a 240v timer motor.
--
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| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ |
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| Stephen J. Beyers 2005-07-12, 12:25 pm |
| Phil -
Thanks - I susepected that was the case. A 240V timer motor
would be an easier fix than a control tansformer, if I can
find one.
Steve
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| phil-news-nospam@ipal.net 2005-07-12, 6:25 pm |
| On Tue, 12 Jul 2005 07:39:57 -0500 Stephen J. Beyers <sjbeyers@shawneelink.net> wrote:
| Thanks - I susepected that was the case. A 240V timer motor
| would be an easier fix than a control tansformer, if I can
| find one.
If they make versions for market in 220-240 volt countries it may well
be the case that the spare part for them will fit. But you also need
to be sure everything else is right for such wiring. For example, are
there any lights that also use the 120 volt line-to-neutral connection?
--
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| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ |
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