ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
nec 110.3 (B)
by gfretwell - 09/22/21 11:11 PM
Grounding electrodes
by gfretwell - 09/07/21 03:41 PM
Looking For Electricians in the Midlands
by Alex247 - 09/06/21 05:26 AM
New in the Gallery:
Now you know.
Now you know.
by Tom_Horne, September 7
February, North East Indiana
February, North East Indiana
by timmp, July 25
Who's Online Now
1 members (HotLine1), 46 guests, and 16 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Jul 2007
Posts: 1,335
S
Member
Hi,

Maybe one of you can save me some homework. Any reason not to plug a portable UPS is isolated ground circuits?


"Live Awesome!" - Kevin Carosa
Joined: Jul 2004
Posts: 9,663
Likes: 4
G
Member
I can't think of anything.
I do think IG is largely snake oil tho.
IBM stopped recommending them about 40 years ago. There was no demonstrated benefit.


Greg Fretwell
Joined: Mar 2004
Posts: 947
T
twh Offline
Member
Originally Posted by gfretwell
I can't think of anything.
I do think IG is largely snake oil tho.
IBM stopped recommending them about 40 years ago. There was no demonstrated benefit.
I don't know about that. I did quite well off them.

Joined: Jun 2004
Posts: 1,273
T
Member
IG came to be quite the 'cause' when computers entered filthly electrical systems.

To go down the list:

Crossed over polarities -- far, far, more common than they should be -- so many out there tying their best to give us more repair work...

Over loaded circuits -- until digital logic came along sagging voltages passed largely without remark...

&&&&&

I've never encountered an IG installation in commercial service that was not companion to an isolated power system: an SDS. ( Secondarily Derived Service )

They went together like bread and butter.

It was a LOT cheaper to just drop these in rather than re-work and correct a fundamentally screwed up building -- some of which were bona-fide antiques.

Now that decades have gone by -- and ABOVE ALL -- with the rise of laptops in general office use (which have intrinsic isolated power and secondarily derived services -- every last one) the passion for IG and isolated power has evaporated.

It won't be coming back any time soon.



Tesla
Joined: Jul 2004
Posts: 9,663
Likes: 4
G
Member
The dirty little secret was IBM figured out they had found the enemy and it was us.
Virtually all of the noise in office electrical systems was coming from the switcher power supplies in our equipment.
When we put in the line filters we should have been using from the git go, it stopped being an issue.


Greg Fretwell
Joined: Apr 2002
Posts: 7,279
Likes: 3
Member
IG circuits, panels, and receptacles generated a lot of $$$ back in the day.

The search for 'clean power' for the electronics gurus went to motor/generator sets, and active UPS units. That was not your 'standard' offices, but research & prototype EEs in the 'chip making' fields.



John
Joined: Jul 2007
Posts: 1,335
S
Member
My neck of the woods is largely behind the times electrically. I have offices wired in Romex of a marginal utility not connect to a grid, no IG, No surge protection, ground rod and connection to water pipe ground, frequent brown, blackouts, spikes from eagles flying into the lines, diesel generator back up and no problem with electronics. The more protected systems, like IG, ground rings, system wide surge protection, overrides neutrals, and the like seem have more problems. Lol!


"Live Awesome!" - Kevin Carosa

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

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

 

Member Spotlight
HCE727
HCE727
Delaware County, PA, USA
Posts: 187
Joined: November 2005
Top Posters(30 Days)
timmp 3
FGBY 2
Popular Topics(Views)
283,041 Are you busy
216,770 Re: Forum
203,168 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5