So, how is 4/0 good for 400A

[petersonra]

saw this note in the camlok catalog.

 

[zbang]

Table 400.5(B) 90 degree "D" column, footnote 1--

The ampacities under subheading D shall be permitted for single-conductor Types SC, SCE, SCT, PPE, and W cable only where the individual conductors are not installed in raceways and are not in physical contact with each other except in lengths not to exceed 600 mm (24 in.) where passing through the wall of an enclosure.

that gives 4/0 types "SC, SCE, SCT, PPE, G, G-GC, and W a 405 amp rating. May have to derate when you get to other terminations .

Lots of SC and W cable is 105deg rated.

 

[GoldDigger]

I do find it interesting that they rate crimp for a lower ampacity than double set screw.
Does not sound like a very good crimp termination.

Tapatalk!

 

[petersonra]

I do find it interesting that they rate crimp for a lower ampacity than double set screw.
Does not sound like a very good crimp termination.

Tapatalk!

the thing I find interesting is that they do not have a crimp tool for this connector nor do they even recommend one.

 

[iwire]

I find that for temp power many will run 4/0 single conductor portable cord up to 400 amps.

I kind of do as well.

If had a 1200 amp load as determined by direct measurement I would run more than 3 sets of 4/0 portable cable.

On the other hand if I am feeding a 1200 breaker I would use three sets of 4/0 portable cable without worry. The actual load will be much less, we also stand by and monitor and control the load as needed.

I have been also know to moderately raise the voltage at the genset to over come voltage drop at the load. Again, we standby and keep an eye on things.

 

[jrannis]

saw this note in the camlok catalog.

One word, free air. :thumbsup:

 

[zbang]

One word, free air.

that's two

 

[mbrooke]

Could just be the way its written. Kind of like 30 amp breakers with a lug listing of 14-8 guage. Only one exception for A/Cs would allow for it, some breakers none at all but its more just the listing.