sparkystevec
Member
- Location
- Rockville Maryland
I have never calculated cable tray before. I am trying to figure the size needed for some romex. I have multiple sizes: 14/2, 12/2, 12/3, 10/2, and 8/2.
cable tray calculations
- Thread starter sparkystevec
- Start date
- Status
Local Electrician
Member
- Location
- NC
IMO- I would say you can fill it up. With no more then three romex cables tied together. with a half inch mimimum in between. :wink:
chris kennedy
Senior Member
- Location
- Miami Fla.
- Occupation
- 60 yr old tool twisting electrician
Help me out, can't find the ?" reference in 392 or 310.15.
billsnuff
Senior Member
- Location
- East of 480sparky
just guessing here
just guessing here
05 handbook exhibit 392.2 (not less than one cable dia. spacing between)
i don't see any ref. to 1/2"
just guessing here
05 handbook exhibit 392.2 (not less than one cable dia. spacing between)
i don't see any ref. to 1/2"
Determine the cross sectional area of each differing type of cable, multiply each cross sectional area by the number of runs of that type to be installed in one tray run, find the number which equals or the smallest which exceeds that area value in Table 392.9, Column 1 and transpose to the left most column of the table. The number there is the minimum width tray which will accommodate the cables you want to install in it.
sparkystevec
Member
- Location
- Rockville Maryland
Smart $
I was going thru the code book and found what you are saying, I just cannot figure out where to find the cross sectional area of each cable. This is what has stumped me. Is there a manufacturing document that would have this info? I appreciate all the help.
I was going thru the code book and found what you are saying, I just cannot figure out where to find the cross sectional area of each cable. This is what has stumped me. Is there a manufacturing document that would have this info? I appreciate all the help.
weressl
Esteemed Member
See the the Cable Tray Sizing Program on the following web-site:
http://www.cooperbline.com/product/CableTray/TechnicalInfo/index.asp
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
Can't say that I have ever seen Romex in a cable tray before.
weressl
Esteemed Member
- Location
- Massachusetts
sparkystevec
Member
- Location
- Rockville Maryland
Thanks for the help from everyone. Those pictures show why many good EC's are having problems staying in business. I cannot imagine anyone trying to tell me to do something like that. Keep up the good workmanship. The reason that I am looking into cable tray, is that I have about 18 romex cables that are running together and I do not like the way they look! (exposed area and legal to be there)
Don't know of any mfgr's docs off hand. Even if you or someone came up with one, cross-sectional areas are likely to vary a little between mfgrs.
If need be, get a measuring caliper, then do the area math.
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