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10-04-2009, 11:54 AM
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#1
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I am a RAT.
Join Date: Sep 2008
Location: Charlotte N.C.
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X-fmer's roughed in the slab
Do any of you rough your x-fmers in the slab if it is possible or do you just flex them in?
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10-04-2009, 12:05 PM
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#2
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I am a RAT.
Join Date: Sep 2008
Location: Charlotte N.C.
Posts: 5,187
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Here is are some pictures of a baby x-fmer that I roughed in the slab.
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10-04-2009, 12:09 PM
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#3
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Senior Member
Join Date: Feb 2009
Location: Long Island, N.Y.
Posts: 2,185
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I always use flex in case it has to be changed.. being fed from the bottom is a real PITA when you don't have use of a fork lift
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10-04-2009, 12:11 PM
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#4
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Ratus Maximumus
Join Date: Apr 2009
Location: South Eastern MA
Posts: 1,340
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Quote:
Originally Posted by william1978
Do any of you rough your x-fmers in the slab if it is possible or do you just flex them in?
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I have not , but if the opportunity presented itself I would not hesitate. I have dropped down to floor below and back up again.
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Bob Badger
Electrical Construction and Maintenance
MA, RI, CT
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10-04-2009, 12:15 PM
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#5
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Rat Extraordinaire
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Location: Iowa
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Depends on the job. If I have the opportunity, yes. But some jobs, like precast mezzanines, don't lend themselves to it.
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10-04-2009, 12:17 PM
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#6
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Senior Member
Join Date: Feb 2009
Location: Long Island, N.Y.
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Why would they bottom feed them that way to begin with?
Seems like really poor engineering for something that weighs hundreds of pounds
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10-04-2009, 12:19 PM
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#7
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I am a RAT.
Join Date: Sep 2008
Location: Charlotte N.C.
Posts: 5,187
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Quote:
Originally Posted by 480sparky
Depends on the job. If I have the opportunity, yes. But some jobs, like precast mezzanines, don't lend themselves to it.
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Thats the way I do it also. PVC is a whole lot cheaper than flex 90's.
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10-04-2009, 12:21 PM
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#8
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Ratus Maximumus
Join Date: Apr 2009
Location: South Eastern MA
Posts: 1,340
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Quote:
Originally Posted by Black4Truck
Why would they bottom feed them that way to begin with?
Seems like really poor engineering for something that weighs hundreds of pounds
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It keeps the transformer from cooking the insulation on the conductors.
I have wired a 1000 KVA that was top feed but there was a ton of air space and venting.
__________________
Bob Badger
Electrical Construction and Maintenance
MA, RI, CT
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10-04-2009, 12:29 PM
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#9
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I am a RAT.
Join Date: Sep 2008
Location: Charlotte N.C.
Posts: 5,187
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Quote:
Originally Posted by Black4Truck
Why would they bottom feed them that way to begin with?
Seems like really poor engineering for something that weighs hundreds of pounds
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It is a whole lot easier to pull the wire when it is in the slab than fight those 90 degree flex conn. I rough mine with 2 90's back and if you tape the wires together and push the wire so that the wire is curled the way the 90's are going the wire will come right out of the other end.
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10-04-2009, 12:32 PM
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#10
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Rat Extraordinaire
Join Date: Sep 2007
Location: Iowa
Posts: 6,792
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Quote:
Originally Posted by Black4Truck
Why would they bottom feed them that way to begin with?
Seems like really poor engineering for something that weighs hundreds of pounds
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What does the weight of the equipment got to do with it? The only problem with weight you could possibly have is if the floor is poorly engineered. I've installed switchgear that far outweighs any transformer in the room and it's bottom fed....
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10-04-2009, 12:39 PM
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#11
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I am a RAT.
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Here are some photos of the panel's that are on the opposite wall.
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10-04-2009, 12:44 PM
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#12
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Senior Member
Join Date: Feb 2009
Location: Long Island, N.Y.
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Quote:
Originally Posted by 480sparky
What does the weight of the equipment got to do with it? The only problem with weight you could possibly have is if the floor is poorly engineered. I've installed switchgear that far outweighs any transformer in the room and it's bottom fed....
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I am talking about having to change the transformer
The ones in the pic, I could use a hand truck to get it out of the space
With bottom feed, that option won't work
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10-04-2009, 12:46 PM
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#13
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Rat Extraordinaire
Join Date: Sep 2007
Location: Iowa
Posts: 6,792
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Quote:
Originally Posted by Black4Truck
I am talking about having to change the transformer
The ones in the pic, I could use a hand truck to get it out of the space
With bottom feed, that option won't work
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How often does this actually happen?
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10-04-2009, 12:47 PM
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#14
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I am a RAT.
Join Date: Sep 2008
Location: Charlotte N.C.
Posts: 5,187
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Quote:
Originally Posted by 480sparky
How often does this actually happen?
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My exact thought. I have never had to replace a x-fmer.
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10-04-2009, 12:52 PM
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#15
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Rat Extraordinaire
Join Date: Sep 2007
Location: Iowa
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Quote:
Originally Posted by william1978
My exact thought. I have never had to replace a x-fmer.
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When I designed my house, everyone told me I was nuts for not having the garage right off the kitchen. I asked why I needed to do so. Everyone said "So when you replace your refrigerator, it will be easy to get the new one in and the old one out!"
I have yet to replace my fridge, and will probably do so only once in the remainder of my life. I would prefer to have a house designed around the things I do every day, like cook, do laundry, sit at the computer and post on ET...........
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10-04-2009, 01:06 PM
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#16
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Senior Member
Join Date: Feb 2009
Location: Long Island, N.Y.
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Quote:
Originally Posted by william1978
My exact thought. I have never had to replace a x-fmer.
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So far, I have had to change (3) of them
One was being fed from the bottom with 500 cu and I will never do that kind of job again.. total PITA bending wires to make them fit 
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10-04-2009, 01:07 PM
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#17
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Rat Extraordinaire
Join Date: Sep 2007
Location: Iowa
Posts: 6,792
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Quote:
Originally Posted by Black4Truck
So far, I have had to change (3) of them
............
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Mebbe you should start supplying better transformers, then. 
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10-04-2009, 01:13 PM
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#18
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Senior Member
Join Date: Feb 2009
Location: Long Island, N.Y.
Posts: 2,185
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Quote:
Originally Posted by 480sparky
Mebbe you should start supplying better transformers, then. |
Mine are all still working fine, it was the other guy who was supplying cheap transformers 
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10-04-2009, 01:23 PM
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#19
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I am a RAT.
Join Date: Sep 2008
Location: Charlotte N.C.
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Quote:
Originally Posted by 480sparky
....., sit at the computer and post on ET...........
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You know thats right. 
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10-04-2009, 01:51 PM
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#20
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Rat Extraordinaire
Join Date: Sep 2007
Location: Iowa
Posts: 6,792
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Quote:
Originally Posted by Black4Truck
Mine are all still working fine, it was the other guy who was supplying cheap transformers |
Then thank him for the work. 
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