Maker Pro
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induced noise

M

Mike Riddell

Jan 1, 1970
0
Hello, I'm in the process of building a lab for my electronics and
computers. I plan on running three separate circuits: one for the
computers, one for my test equipment and one for general usage. I would
like to use 14/3 cable to run from the panel to the workbench areas but I am
concerned that there is the possibility of noise being induced into one of
the other circuits. The 14/3 would be the cleanest way of routing the wire
but running three separate wires would not be a problem either. Am I being
overly cautious or is this a valid concern? Your input would be greatly
appreciated.
 
H

Henry Kolesnik

Jan 1, 1970
0
You'll be fine, go ahead. Use 12/3 if you going to load to 20 amps.
hank wd5jfr
 
D

Dbowey

Jan 1, 1970
0
Mike posted:
Hello, I'm in the process of building a lab for my electronics and
computers. I plan on running three separate circuits: one for the
computers, one for my test equipment and one for general usage. I would
like to use 14/3 cable to run from the panel to the workbench areas but
I am concerned that there is the possibility of noise being induced into one of
the other circuits. The 14/3 would be the cleanest way of routing the wire
but running three separate wires would not be a problem either. Am I being
overly cautious or is this a valid concern?

You will be less likely to have noise if you use separate wires to bring in the
power.

You should use 14/3 "with ground." 12/3 with ground would be only a little
more expensive, and you would then have 20 Amp capability if you also use 20
Amp breakers. The ground wire provides a safety ground.

Also, if you want to have 220 (240) Volts available at the lab, be sure each of
the 110 connections at the breaker box ( Red & Black) is tied to a different
side of the incoming line. You will have 110V from Red to neutral (white), and
110V from Black to neutral, and 220V between Red and Black. A "220V" breaker,
due to how it is built, connects to the two different sides when it is seated
in the box.

Also, a GFCI would be a good idea for a lab. Mine operate on just a few
hundred millivolts. I've popped them off without feeling anything, so I know
they are a good thing to have.

Don

Don
 
P

Peter Bennett

Jan 1, 1970
0
Hello, I'm in the process of building a lab for my electronics and
computers. I plan on running three separate circuits: one for the
computers, one for my test equipment and one for general usage. I would
like to use 14/3 cable to run from the panel to the workbench areas but I am
concerned that there is the possibility of noise being induced into one of
the other circuits. The 14/3 would be the cleanest way of routing the wire
but running three separate wires would not be a problem either. Am I being
overly cautious or is this a valid concern? Your input would be greatly
appreciated.

As I read this, I suspect you are planning to run a _single_ 14/3
cable which will carry all three circuits - this is neither legal or
possible, as you need hot, neutral, and safety ground wires for _each_
circuit.

According to my knowledge of the Canadian Electrical Code, you must
use three separate 14/2 cables, if the circuits are fed by 15 amp
breakers, or 12/2 if you have 20 amp breakers. A 14/2 or 12/2 cable
will actually have three conductors: black (hot), white (neutral) and
uninsulated (safety ground).

If two of the circuits are on opposite 120V phases, you could combine
them into one 14/3 or 12/3 cable, sharing the neutral.
 
T

Thomas C. Sefranek

Jan 1, 1970
0
Mike Riddell said:
Hello, I'm in the process of building a lab for my electronics and
computers. I plan on running three separate circuits: one for the
computers, one for my test equipment and one for general usage. I would
like to use 14/3 cable to run from the panel to the workbench areas but I am
concerned that there is the possibility of noise being induced into one of
the other circuits. The 14/3 would be the cleanest way of routing the wire
but running three separate wires would not be a problem either. Am I being
overly cautious or is this a valid concern? Your input would be greatly
appreciated.
Mike,

You ARE aware that there are filtered power feeds, right?
Corcom comes to mind....but there are others.
If you properly install a good filter on all three drops,
you should not couple any noise from one circuit to another.


--
*
| __O Thomas C. Sefranek [email protected]
|_-\<,_ Amateur Radio Operator: WA1RHP
(*)/ (*) Bicycle mobile on 145.41, 448.625 MHz

http://hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org
 
D

Dbowey

Jan 1, 1970
0
dbowey's post included:
"You will be less likely to have noise if you use separate wires to bring in
the
power."

--

That IS NOT what I intened to say. You will be less likely to have noise if
you use cable (14/3 or 12/3 with ground) to bring in the power.

Sorry about that..

Don
 
J

John Larkin

Jan 1, 1970
0
Hello, I'm in the process of building a lab for my electronics and
computers. I plan on running three separate circuits: one for the
computers, one for my test equipment and one for general usage. I would
like to use 14/3 cable to run from the panel to the workbench areas but I am
concerned that there is the possibility of noise being induced into one of
the other circuits. The 14/3 would be the cleanest way of routing the wire
but running three separate wires would not be a problem either. Am I being
overly cautious or is this a valid concern? Your input would be greatly
appreciated.

Ac power is noisy; there's no point in separating circuits.

John
 
R

Ross Mac

Jan 1, 1970
0
Mike Riddell said:
Hello, I'm in the process of building a lab for my electronics and
computers. I plan on running three separate circuits: one for the
computers, one for my test equipment and one for general usage. I would
like to use 14/3 cable to run from the panel to the workbench areas but I am
concerned that there is the possibility of noise being induced into one of
the other circuits. The 14/3 would be the cleanest way of routing the wire
but running three separate wires would not be a problem either. Am I being
overly cautious or is this a valid concern? Your input would be greatly
appreciated.
If you are worried about electrical noise, just install a good UPS...No
matter how you wire it....what comes off the pole is not always
clean.....Ross
 
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