Is this Dangerous?

[infinity]

I had to go to a building today and install some CT's to energize a feeder that we ran a year ago to a retail space. Another contractor did the fit out which picked up our 480 volt feeder and installed the 480-208Y/120 volt step down transformer. When I opened the 400 amp load side disconnect this is what I found. 400 amp fuses with 500 kcmil conductors and no GEC not to mention the wiring issue on the 400 amp disconnect.

 

[winnie]

neatly done for horribly wrong

 

[hillbilly1]

Imagine what you will find when you open that transformer! LOL!
Have to gig you about your LOTO though! LOL!

 

[infinity]

Imagine what you will find when you open that transformer! LOL!
Have to gig you about your LOTO though! LOL!

There are no fuses in the switch. I thought about removing the cover but ran out of time.

 

[K8MHZ]

Their tape job is flawless. Best I've ever seen.

 

[ptonsparky]

Only dangerous if you open the door.

 

[infinity]

Only dangerous if you open the door.

What if you have to replace a fuse?

 

[petersonra]

The GEC could be connected inside the xfmr.

The backwards wiring of the switch is inexcusable though, IMO.

Wire sizing seems ok.

 

[david luchini]

Wire sizing seems ok.

240.21(C)?

 

[infinity]

The GEC could be connected inside the xfmr.

The backwards wiring of the switch is inexcusable though, IMO.

Wire sizing seems ok.

No external conductors that could be a GEC at the transformer, just an EGC with the feeder and a SSBJ with the secondary conductors. With a 400 amp fuse the secondary conductors cannot be 500 kcmil or what David said.

 

[petersonra]

240.21(C)?

(C) Transformer Secondary Conductors. A set of conductors
feeding a single load, or each set of conductors feeding separate
loads, shall be permitted to be connected to a transformer
secondary, without overcurrent protection at the secondary

The fuses are OCP so I don't see how 240.21 (C) would apply at all.

 

[ptonsparky]

What if you have to replace a fuse?

Then it is dangerous!!

 

[hillbilly1]

There are no fuses in the switch. I thought about removing the cover but ran out of time.

Still have to lock and tag it! LOL!

 

[gadfly56]

Still have to lock and tag it! LOL!

The zip tie is the lock and the hand lettered sign is the tag. Nothing says it has to be pretty. If you wanted to be a stickler, you could punch a hole in the paper and run the zip tie through it. That meets the minimum for LOTO.

 

[tom baker]

The fused disconnect switch is upside down.

 

[hillbilly1]

The zip tie is the lock and the hand lettered sign is the tag. Nothing says it has to be pretty. If you wanted to be a stickler, you could punch a hole in the paper and run the zip tie through it. That meets the minimum for LOTO.

Run that by OSHA and get back to me on that.

 

[infinity]

Why would it need to be locked out in the first place? There are no fuses in the disconnect.

The 500 kcmil is too small:

 

[LarryFine]

Why would it need to be locked out in the first place? There are no fuses in the disconnect.

Because they're sitting on the transformer, and could be re-installed?

 

[hillbilly1]

Why would it need to be locked out in the first place? There are no fuses in the disconnect.

The 500 kcmil is too small:

Just giving you a hard time! LOL!

 

[mikeames]

Somebody could be killed If the person who has to replace those fuses is not paying attention, and does not following procedure. Open the switch and expect the fuses de-energized.