spaced cables

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Joined: 04/01/2013 - 3:48pm
spaced cables

In the cable types table (i.e. catalog of cables), should all cables 4/0 and larger be set to "SPACED" in the column "CONDUCTOR SIZE"? Would that be a good practice to avoid the mistake of laying them in tray without spacing? We do have some 3-1/conductor cables and those are set to "Triplexed"; those are good to go.

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Joined: 05/31/2012 - 9:19am

HC,

     There is no requirement to lay large cables spaced.  The reason why engineers would spec them to be spaced is that the cables need to spacing in order to carry more current.  This is actually a cable ampacity issue and is usually handled by the engineering team on a case by case basis depending on what that particular cable will be doing.  In effect, the engineering is done by setting the 'LoadMatic Look-Up Tables' and deciding whether or not a particular motor will be fed with a spaced cable at a smaller diameter or a cable that it is not spaced at a larger diameter.

     When a company is using LoadMatic on the project, please do not put 'SPACED' in the 'Conductor Size' column.  The reason for this is that LoadMatic needs to know the actual size of the conductor in order to perform some of its calculations, and it goes without saying that 'SPACED' is not an actual conductor size.  

     Instead, If you want specific cables to be spaced, utilize the 'NEC Override Rule' in the ACRS_CABLE_DATA spreadsheet.

Hope that helps, 

GSN Tech

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