ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Do You Wrap Your Receptacles?
by gfretwell - 02/20/24 10:48 PM
Cable Chase Code Requirement
by renosteinke - 02/16/24 07:00 PM
Do we need grounding?
by gfretwell - 02/16/24 10:37 AM
Cordless Tools: The Obvious Question
by gfretwell - 02/08/24 07:28 AM
Is this really a thing
by renosteinke - 02/07/24 01:15 PM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
1 members (Scott35), 40 guests, and 19 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#76458 02/08/01 10:46 AM
Joined: Nov 2000
Posts: 123
D
doc Offline OP
Member
In this plant we have 3 complete different services coming into it,I'm talking meters and all.The building has walls breaking it into sections,
can we run power out of service 1 into a room and then come from service 2 or 3 into same room . I don't think they should be mixedor if they can what are the guide lines for mixing.
the service is 220 3 phase and 440 3 phase .
The voltages running into same rooms from different sources or 110 up to 440 single and 3 phase


MAY THE SUN SHINE ON YOUR FACE IN THE MORNING AND YOU AWAKE WITH A SMILE
Stay up to Code with the Latest NEC:


>> 2023 NEC & Related Reference & Exam Prep
2023 NEC & Related Reference & Study Guides

Pass Your Exam the FIRST TIME with the Latest NEC & Exam Prep

>> 2020 NEC & Related Reference & Study Guides
 

#76459 02/08/01 11:17 AM
Joined: Nov 2000
Posts: 2,148
R
Member
Doc,
I don't see a violation of the NEC other than a probable violation of 230-2(e). There also may be OSHA issues as far as the required lockout/tagout procedures.
Don(resqcapt19)


Don(resqcapt19)
#76460 02/08/01 04:39 PM
Joined: Jan 2001
Posts: 29
S
sam Offline
Member
should each service have a permenant tag stating building serviced by the number of services to the building (on each service) that way fire department has a way of knowing to.

[This message has been edited by sam (edited 02-08-2001).]

#76461 02/08/01 05:52 PM
Joined: Oct 2000
Posts: 5,392
S
Member
230-2-e (identification)kicks you over to 225-37( more identification)which tells you to mark everything.

Then we come to Ex #1 which basically says that you can blow that off if you maintain "safe switching procedures"
( exceptions can be so conflicting!)

This is probably what Don stated.... [Linked Image]

Once in a while i'll go on a service call where everything is identified. I'm sure it takes some time, but it sure saves some too... [Linked Image]

As i read it,without hashin' 230 too hard, you could have six meters and mains, .

I wonder if some places are purposley set up this way to avoid larger more expensive services, or to introduce a variety of voltages without having to pitch for an X-former
[Linked Image]

#76462 02/09/01 01:31 PM
Joined: Nov 2000
Posts: 123
D
doc Offline OP
Member
maybe I was misinformed,but in a similar plant we had to different services coming in and they ran power all over the plant .The company wanted to add a large sub panel so we called in a large contrating company {electrical } and they told us we could not mix the services up and he was paid a gob of money to run new circuits and keep them in same room.When he was finished room 1,2,3
was from service #1 and room 4,5 were on service # 2. This where I am confused as what you guys are saying is maybe the old company I worked for may have been taken if there is nothing wrong with mixing


MAY THE SUN SHINE ON YOUR FACE IN THE MORNING AND YOU AWAKE WITH A SMILE
#76463 02/09/01 07:51 PM
Joined: Oct 2000
Posts: 5,392
S
Member
Was it done simply to restore some sense of order?

#76464 02/15/01 01:14 PM
Joined: Nov 2000
Posts: 123
D
doc Offline OP
Member
According to the electrical contractor,it was a serious violation to mix services,and therefore to get up to code we had to pull circuits out of an area that was provided by say service one and run circuits from service 2 into the location that service 1 had been powering that way all power in that room was from one service and disconnects are all in same area


MAY THE SUN SHINE ON YOUR FACE IN THE MORNING AND YOU AWAKE WITH A SMILE
#76465 02/15/01 04:22 PM
Joined: Jan 2001
Posts: 75
G
Member
I am not aware on any rules in NEC 230 dis-allowing the inter-mixing of the conductors in a raceway after they left an OC device.
It does seem that it should considered as an separated devired, somewhere in 230-2, and would require a transfer switch in case some of the conductors inter-connected and thus a possible 'back-feed' into a service that is down for repairs etc.
Who knows when an insulation break-down may happen between the one or more services?

It may not be a violation, but could be a saftey issue.

Glenn


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC + Exam Prep Study Guides Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Attic Rat
Attic Rat
Bergen Co.,N.J. USA
Posts: 524
Joined: December 2003
Top Posters(30 Days)
maxecn 5
Admin 3
Popular Topics(Views)
317,848 Are you busy
242,682 Re: Forum
226,713 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5