300.19 (A)

[zcanyonboltz]

Table 300.19 (A) has some long lengths without a support required. For example a run of Aluminum 4/0 AWG through 350 kcmil only needs to be supported every 135 feet. Most conduits require support every 10', am I missing something here is this table for a raceway other than conduit?

 

[JFletcher]

Table 300.19 (A) has some long lengths without a support required. For example a run of Aluminum 4/0 AWG through 350 kcmil only needs to be supported every 135 feet. Most conduits require support every 10', am I missing something here is this table for a raceway other than conduit?

It's a table for conductors inside vertically installed conduit. The conduit still needs to be supported every 10'. Aluminum is markedly lighter than copper, thus it doesnt need support as often.

 

[zcanyonboltz]

So how would you support the conductors inside the conduit, a connector that has a way to take weight off the wire conductors?

 

[JFletcher]

300.19(C) would be the code standpoint. From a practical 'what to do/use?' standpoint, I dont know, only once had to deal with weight thru a vertical run, with comm cables. There are extremely few buildings here where 300.19 would come into play.

 

[augie47]

There are fittings made specifically for that purpose,
I will find a link.
Most common are basically a rubber wedge used at pull boxes.