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Old 08-12-2018, 09:28 AM   #1
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Default Bust Week

We have had a busy week (not a BUST Week), slammed with work we had a major customer have 2-4000 amp busways fault. The busways were run vertically one on top of the other. top busway faulted taking out the bottom. The customer had spare tap boxes which were a major help in making a temporary fix.

Halfway through the repair on Friday night, another customer had a 1200 amp MDP that feeds two chillers blow up. Had to open up a supply house, have circuit breakers curried from Pennsylvania and arrange for an after-hours inspection without a permit. Permit on Monday.
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Ah, but I was so much older then, I'm younger than that now

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Old 08-12-2018, 09:31 AM   #2
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cccccccccccccccccccccccccc
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Ah, but I was so much older then, I'm younger than that now

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Old 08-12-2018, 09:34 AM   #3
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2nd try
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Old 08-12-2018, 09:35 AM   #4
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I'm going to stop calling you Lucky.
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Old 08-12-2018, 10:01 AM   #5
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Not the pics I thought would be here!
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Old 08-12-2018, 10:08 AM   #6
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Interesting how different copper and aluminum bus duct fails.
Great save having those tap boxes, I remember having to make our own.

How did you decide on how many conductors to use for the temporary, did you use 6 -4/0 welding cables per phase or did you know what the actual load was?
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Old 08-12-2018, 10:09 AM   #7
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I'm going to stop calling you Lucky.
Think of it this way Cha Ching, Cha Ching.

Busway is a wonderful product until it faults
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Old 08-12-2018, 10:13 AM   #8
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Interesting how different copper and aluminum bus duct fails.
Great save having those tap boxes, I remember having to make our own.

How did you decide on how many conductors to use for the temporary, did you use 6 -4/0 welding cables per phase or did you know what the actual load was?
Having a tap box was a major help.

We took the energy management readings for the last 12 months the 2- 4000 amp busways carried 880 and 910 maximum current downsized the fuses from 4000 amp to 3000 amp and used aluminum SER due to the location to an entrance door.

Upstairs we used 8-400 amp busway switches to jump from one busway to the 2nd busway
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Old 08-12-2018, 10:31 AM   #9
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I'd love to know what the final bill was on this....$$$
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Old 08-12-2018, 12:00 PM   #10
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You can thank the pig trough of government for all the work you have. Oink oink!
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Old 08-12-2018, 12:05 PM   #11
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What causes the failures of buss? I can see water leaks. The connections between segments?
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Old 08-12-2018, 12:20 PM   #12
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Do you plan replacing the entire bus ducts ?
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Old 08-12-2018, 01:02 PM   #13
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A Scotch Brite and some elbow grease and the bus will clean up and look good as new.
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Old 08-12-2018, 01:06 PM   #14
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I’m sure that will buff right out.
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Old 08-12-2018, 02:51 PM   #15
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musta been a great show.
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Old 08-12-2018, 03:55 PM   #16
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I'd love to know what the final bill was on this....$$$
Enough to celebrate bust week.
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Old 08-12-2018, 06:46 PM   #17
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Do you plan replacing the entire bus ducts ?
Generally, we recommend it or at least everything upstream of the fault, but insurance companies dictate this anymore.
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Old 08-12-2018, 06:48 PM   #18
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What causes the failures of buss? I can see water leaks. The connections between segments?
Water is the number one issue and in my experience always at the joints, this was away from the joint had most likely a fault in the insulation at the 90.
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Old 08-12-2018, 08:00 PM   #19
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Water is the number one issue and in my experience always at the joints, this was away from the joint had most likely a fault in the insulation at the 90.
I can't count the number of electrical rooms I've been in that have had plastic draped over the gear. At least they did something rather than letting water drip on everything forever. I think the last blowup I ever did was water that got into a fire pump controller, which are about as close to unfused as you can get. It sizzled for a while before the circuit went open. Actually, I think it burned open.
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Old 08-12-2018, 10:42 PM   #20
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Water is the number one issue and in my experience always at the joints, this was away from the joint had most likely a fault in the insulation at the 90.

Last one i was un-lucky enough to see was a bottom 90 during rain. It didnt burn alone the duct like yours it just blow across and looked like someone had cut a 3-4 inches out of it.
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