Monday Photos (Spot the Violations)

[480sparky]

Another round of goodies sent me from another Forumer.

 

[elohr46]

Another round of goodies sent me from another Forumer.

control wiring in sprinkler rooms/mechanical rooms almost always generate a lot of brutality, different size ground wires under one lug is also a common occurance. Installer had a lot of red and blue wire left over from the last job and could that be a corner grounded delta transformer connection mistake?

 

[RUWired]

Another round of goodies sent me from another Forumer.

Looking for some sealtight here.

And here

Lug is not pretty and not rated for that # 12 awg wire as well

In defense of the install, some tray cable doesn't come standard with white.If this is tray cable. Are there two different wires in the main lug. it looks like a fine strand with a course strand.

Gotta find out whats up here.

Nice pics.hows is the transformer being wired.

 

[infinity]

Nice pics.hows is the transformer being wired.

My guess, like elohr46, is that it's a reverse wired corner grounded Delta setup.

 

[dcspector]

Ken so graciously posted these for me. Long story but sometimes on a fed based system it does not work for me to post. Picture #1 and #2 Fire pump look at the wiring method to motor......#3 How many egc's can we install in one lug? This is in an ATS not that has anything to do with it......#4 grounded conductors are in a raceway to panel.......#5 transformer....is that a corner ground Delta?

 

[electricalperson]

looks like an idiot wired that transformer. its obviously a 480v/277v - 120/208v transformer. your supposed to bond XO instead. he used the same size wire for the primary and secondary? might be a waste of money

 

[480sparky]

looks like an idiot wired that transformer. its obviously a 480v/277v - 120/208v transformer. your supposed to bond XO instead. he used the same size wire for the primary and secondary? might be a waste of money

I noticed there's no conductor connectioned to the Xo at all.

 

[electricalperson]

I noticed there's no conductor connectioned to the Xo at all.

well even if there is no neutral you still need to bond it to the GEC. i doubt that transformer even worked properly. whats the point of having a corner grounded delta anyway in a building? what would they use that for?

 

[chevyx92]

well even if there is no neutral you still need to bond it to the GEC. i doubt that transformer even worked properly. whats the point of having a corner grounded delta anyway in a building? what would they use that for?

Not true at all. If it's a reverse-fed xfmr with no incoming or out going neutral needed. Looks ok if it is a corner grounded delta. I will add they should have made that corner ground on "B" phase not "A" as they did.

 

[infinity]

looks like an idiot wired that transformer. its obviously a 480v/277v - 120/208v transformer. your supposed to bond XO instead. he used the same size wire for the primary and secondary? might be a waste of money

I would look at the photo again before I would call the installer an idiot. For one thing the conductors are not the same size since the 208 volt conductors are paralleled.

 

[chevyx92]

i doubt that transformer even worked properly.

It will work just fine for the right purpose. I never would have believed it myself either, until I learned about it and actually did an install similar to that.

 

[electricalperson]

I would look at the photo again before I would call the installer an idiot. For one thing the conductors are not the same size since the 208 volt conductors are paralleled.

my bad

but whats the point of a corner grounded delta system?

 

[480sparky]

Not that it's a violation, buy why spend the money for double lugs on the high voltage side when there's only one conductor connected to it?
http://i214.photobucket.com/albums/cc172/480sparky/Spot the Violation/STVG15.jpg

 

[electricalperson]

Not that it's a violation, buy why spend the money for double lugs on the high voltage side when there's only one conductor connected to it?
http://i214.photobucket.com/albums/cc172/480sparky/Spot the Violation/STVG15.jpg

i still want to know why H1 is grounded and whats the purpose of that

 

[chevyx92]

Not that it's a violation, buy why spend the money for double lugs on the high voltage side when there's only one conductor connected to it?
http://i214.photobucket.com/albums/cc172/480sparky/Spot the Violation/STVG15.jpg

I guess you see something I don't. The high voltage side that I see has the corner ground on it and the other I can't definitively make that call.

 

[chevyx92]

i still want to know why H1 is grounded and whats the purpose of that

Because they reverse fed a delta-wye xfmr. Meaning they powered the secondary side to create the delta coming out. And since you can't have an ungrounded system(unless you meet certain requirements) they ground one phase to stabillize voltage.

 

[electricalperson]

Because they reverse fed a delta-wye xfmr. Meaning they powered the secondary side to create the delta coming out. And since you can't have an ungrounded system(unless you meet certain requirements) they ground one phase to stabillize voltage.

so its just strictly 3 phase? is H1 a neutral or is it an actual phase conductor?

 

[chevyx92]

so its just strictly 3 phase? is H1 a neutral or is it an actual phase conductor?

It's a phase conductor. Between phases you would read 480v.

 

[electricalperson]

i just looked up corner grounded delta and now i have another question. if theres no neutral how will the OCPD trip if theres a fault? especially on the grounded phase?

 

[chevyx92]

so its just strictly 3 phase?

You got it. 3 phase in and 3 phase out.