Electrician Talk banner

1 - 8 of 8 Posts

·
Registered
Joined
·
6 Posts
Discussion Starter #1
Hi there,

I have a question about ampacity of a high flex strang hook up wire that is 2/0 that has stranding of 1330 and it is rated for 105 deg celcius. Please look at the following link for more information on this part number: L72/0F-XX . I cannot find anywhere how much ampacity does this cable carries. I know it is definitely higher than 195 Amps at 90 deg Celcius, plus this one probably has more strands?

http://www2.omnicable.com/catalog/hook-up-wire-ul-1015-ul-1028-ul-1283-hook-up-wire-hook-up-wire/

I have been looking in the NEC chart and it only covers up to 90 deg celcius.

Hope someone could guide me how to determine the ampacity of a wire or at least could tell me what is the ampacity of this wire here..

Thanks!
 

·
Registered
Joined
·
2,219 Posts
This is what you are looking for.

From the 2008 NEC
310-15.A.1

FPN No. 2: For the allowable ampacities of Type MTW wire, see Table 13.5.1 in NFPA 79-2007, Electrical Standard for Industrial Machinery.
 

·
Salty Member
Joined
·
31,081 Posts
If the application is covered by the NEC you might not be able to use that cable at all.

If you can use it you will likely have to size it based on 75C as that will likely be the rating of the termination.
 

·
Super Moderator
Joined
·
22,042 Posts
Fine-stranded conductors and cables are considered as those cables having stranding more numerous than Class B stranding. Class B stranding (the most common) will normally have 7 strands of wire per conductor in sizes 18-2 AWG, 19 strands in sizes 1-4/0 AWG, and 37 strands in sizes 250-500 kcmil.

Conductors having more strands than these are widely available and are in different classes such as K and M used for portable power cords and welding cables.

Commonly used building-wire cables such as USE, THW, RHW, THHN and the like are most commonly available with Class B stranding, but are also readily available with higher stranding.

Fine-stranded cables are frequently used by PV installers to ease installation and are used in PV systems for battery cables, power conductors to large utility-interactive inverters and elsewhere.
 

·
Registered
Joined
·
6 Posts
Discussion Starter #6
Thank you for everybody response.

I was trying to get Ampacity of 400 Amps with just two 00 wire because I have a distribution block that only takes 00 wires instead of 000.

If this wire (gives 336 Amps) is used from distribution block into a circuit breaker, and I sized it according to 105deg celcius, I guess I might overheat the CB lugs?
 

·
Registered
Joined
·
351 Posts
Thank you for everybody response.

I was trying to get Ampacity of 400 Amps with just two 00 wire because I have a distribution block that only takes 00 wires instead of 000.

If this wire (gives 336 Amps) is used from distribution block into a circuit breaker, and I sized it according to 105deg celcius, I guess I might overheat the CB lugs?
Yes, exactly.
 

·
Salty Member
Joined
·
31,081 Posts
Thank you for everybody response.

I was trying to get Ampacity of 400 Amps with just two 00 wire because I have a distribution block that only takes 00 wires instead of 000.

If this wire (gives 336 Amps) is used from distribution block into a circuit breaker, and I sized it according to 105deg celcius, I guess I might overheat the CB lugs?
And the distribution block most likely.

You would need two - 3/0s per phase to get 400 amps.
 
1 - 8 of 8 Posts
Top