The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Calling all Non-US members!! (Non-US only)
by aussie240
Yesterday at 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
sparkyinak 7
Trumpy 6
Who's Online
1 registered (HotLine1), 214 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#5427 - 11/19/01 05:11 AM industrial control wiring
ctolbert Offline
Member

Registered: 08/09/01
Posts: 33
Loc: 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
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
http://www.automationdirect.com

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#5428 - 11/19/01 06:16 AM Re: industrial control wiring
JBD Offline
Member

Registered: 07/12/01
Posts: 599
Loc: 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.

Top
#5429 - 11/19/01 06:19 AM Re: industrial control wiring
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
Carl,
Is the control circuit a grounded circuit? There is a lot of 120 volt ungrounded control circuits out there.
_________________________
Don(resqcapt19)

Top
#5430 - 11/19/01 06:31 AM Re: industrial control wiring
ctolbert Offline
Member

Registered: 08/09/01
Posts: 33
Loc: 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
http://www.automationdirect.com

Top
#5431 - 11/19/01 06:40 AM Re: industrial control wiring
motor-T Offline
Member

Registered: 11/10/01
Posts: 293
Loc: 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.

Top
#5432 - 11/19/01 08:35 AM Re: industrial control wiring
ggardiner Offline
Member

Registered: 10/22/01
Posts: 81
Loc: 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.

Top
#5433 - 11/22/01 06:37 AM Re: industrial control wiring
spkjpr Offline
Member

Registered: 12/01/00
Posts: 226
Loc: 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).]

Top
#5434 - 11/22/01 08:02 AM Re: industrial control wiring
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: 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)

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals