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industrial control wiring #5427
11/19/01 08:11 AM
11/19/01 08:11 AM
C
ctolbert  Offline OP
Member
Joined: Aug 2001
Posts: 31
Cumming, GA USA
A warm hello to all:

Is there any benefit for fusing the neutral on a 120vac control circuit. I see a lot of this.

Am I wrong to think of this as similar to a 120vac breaker box....

Carl


Carl Lee Tolbert
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Re: industrial control wiring #5428
11/19/01 09:16 AM
11/19/01 09:16 AM
J
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
Control circuits are no different than any other electrical circuit.

You never fuse a grounded conductor. OCPDs that open the grounded and hot conducters simultaneously are allowed.

Re: industrial control wiring #5429
11/19/01 09:19 AM
11/19/01 09:19 AM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Carl,
Is the control circuit a grounded circuit? There is a lot of 120 volt ungrounded control circuits out there.


Don(resqcapt19)
Re: industrial control wiring #5430
11/19/01 09:31 AM
11/19/01 09:31 AM
C
ctolbert  Offline OP
Member
Joined: Aug 2001
Posts: 31
Cumming, GA USA
I have seen both, can you eleaborate on both situations?

Carl


Carl Lee Tolbert
Technical Support
AC Drives
Automationdirect.com
Your source for the most practical automation products at almost-free pricing, delivered by 11 a.m., just by clicking a mouse.
PH: (770)844-4200
Fax:(770)886-3199
www.automationdirect.com
Re: industrial control wiring #5431
11/19/01 09:40 AM
11/19/01 09:40 AM
M
motor-T  Offline
Member
Joined: Nov 2001
Posts: 280
Girard, Ohio, USA
Ctolbert;
I know it was common practice years ago, but today they usually ground oneside of the seccondary and fuse the other on a control circuit. On 480 volt control, I think they still do because of both conductors being hot. The old drum controllers especially for cranes were not fused if there were a problem the operator would pull the main disconnet right behing him.

Re: industrial control wiring #5432
11/19/01 11:35 AM
11/19/01 11:35 AM
G
ggardiner  Offline
Member
Joined: Oct 2001
Posts: 81
Calgary, Alberta Canada
You have to watch European equipment for fusing on the neutral side they seem to do this a lot and can cause a great deal of problems for North American Electricians who don't realize it.

Re: industrial control wiring #5433
11/22/01 09:37 AM
11/22/01 09:37 AM
S
spkjpr  Offline
Member
Joined: Dec 2000
Posts: 218
Sedalia,MO, USA
Resqcapt19 is right. As an industrial electrician I see a lot of ungrounded secondaries out there. I ground all I find. If the secondary is not grounded and one shorts it to ground, then fireworks and some real frazzled nerves. That's why the "neutral" side was fused. By the way Resqcapt19 are you a volunteer firefighter?

[This message has been edited by spkjpr (edited 11-22-2001).]

Re: industrial control wiring #5434
11/22/01 11:02 AM
11/22/01 11:02 AM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Spkjpr,
I'm now the assistant chief of a volunteer civil defense fire/rescue squad. I've been with the squad since 1969. The screen name is a few years old when I was a captain. The 19 is my gear number. We provide mutual aid rescue, fire fighting, air supply and lights at larger incidents.
Don


Don(resqcapt19)

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