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#215212 - 03/23/15 04:48 PM Portable UPS on isolated ground circuits  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,313
Alaska
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

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#215213 - 03/23/15 06:11 PM Re: Portable UPS on isolated ground circuits [Re: sparkyinak]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,057
Estero,Fl,usa
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

#215214 - 03/23/15 08:47 PM Re: Portable UPS on isolated ground circuits [Re: gfretwell]  
twh  Offline
Member
Joined: Mar 2004
Posts: 903
Regina, Sask.
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.


#215215 - 03/23/15 10:37 PM Re: Portable UPS on isolated ground circuits [Re: sparkyinak]  
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
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

#215216 - 03/24/15 03:56 AM Re: Portable UPS on isolated ground circuits [Re: sparkyinak]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,057
Estero,Fl,usa
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

#215219 - 03/24/15 02:24 PM Re: Portable UPS on isolated ground circuits [Re: sparkyinak]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,798
Brick, NJ USA
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

#215220 - 03/25/15 12:54 AM Re: Portable UPS on isolated ground circuits [Re: sparkyinak]  
sparkyinak  Offline
Member
Joined: Jul 2007
Posts: 1,313
Alaska
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


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