maximum footage on a run of EMT

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charlie said:
This is a great document. I have used the tables that were first developed at the Georgia Tech by Dr. Sakis Meliopoulos. Dick Loyd was also involved with the setting up and testing to get the results that are published in this book.......
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If you , or anyone interested follows the link,... http://www.steelconduit.org./
there is a whole lot of good stuff ,..the question and answers section is full of good stuff including the Study by Georgia Tech ,.. #s 19 and 20 I think .
 
M. D. said:
If you , or anyone interested follows the link,... http://www.steelconduit.org./
there is a whole lot of good stuff ,..the question and answers section is full of good stuff including the Study by Georgia Tech ,.. #s 19 and 20 I think .
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There is a free download of the GEMI software on that site. The GEMI software can be used to provide data on the effectiveness of steel conduit as a fault curent path for different distances of pipe.

Chris
 
sparkle said:
Does anyone know where in the code it may state the max. amount of EMT you can run (straight) before you have to put a pullpoint/box?
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Is the straight run is vertical? If so and you're pulling large conductors you may need a box every 40' to support the conductors.
 
If at some length,.. the emt fails to provide a low impedance path ,.. would that not be a violation of the code??
 
M. D. said:
If at some length,.. the emt fails to provide a low impedance path ,.. would that not be a violation of the code??
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Why, that could never happen! :grin:

troffers6.jpg
 
M. D. said:
If at some length,.. the emt fails to provide a low impedance path ,.. would that not be a violation of the code??
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How about 250.4(A)(3).

If the impedance is to high then there would no longer be an effective ground-fault current path.

Again there is no set standards for when a fault current path is no longer effective, but the GEMI software could possibly help with that.

Chris
 
This is why we have problems in field, this guy has no buisness teaching anything he has no code number for. He is turning out what we do not need. Students need to start saying SHOW ME WHERE. Smack him with 277 and wake him up. He is a diservace to all newbees
 
Jim W in Tampa said:
This is why we have problems in field, this guy has no buisness teaching anything he has no code number for. He is turning out what we do not need. Students need to start saying SHOW ME WHERE. Smack him with 277 and wake him up. He is a diservace to all newbees
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You know this is a lil off topic but I gotta tell it. When I was in school I had this instructor who was in the field for 25 years, has licenses in multiple states blah blah.

Anyway when he was teaching about the older style resistor dimmers he made a statement that circuits with resistor style dimmers used exactly the same amount of circuit power when they were dimming as they did when they were full bright. The energy was just dispelled as heat instead of through the lights. We argued twice about the subject and I could never get him to back off of it.
 
You need to install the EMT at a 1/4 inch drop per foot to keep the pulling tension from getting too high. Hots on the left. Neutrals on the right (grounds up). Conductors run downhill.

U R Lectrishun.

Mark
 
busman said:
You need to install the EMT at a 1/4 inch drop per foot to keep the pulling tension from getting too high. Hots on the left. Neutrals on the right (grounds up). Conductors run downhill.

U R Lectrishun.

Mark
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The pitch is for up north so that if you turn power off the extra electrons drain before freezing.
 
M. D. said:
If at some length,.. the emt fails to provide a low impedance path ,.. would that not be a violation of the code??
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Yes, it would be, but the GEMI software shows that this length is longer than that of an EGC sized per Table 250.122. The same violation exists with long EGCs of the wire type.
 
infinity said:
Is the straight run is vertical? If so and you're pulling large conductors you may need a box every 40' to support the conductors.
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good question. . I bet it is something like that. . It seems like there is something missing in the whole situation. .
 
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