What's 6 mmsq converted to circular mils? Go from there
Actually, I think it could be debated as maybe the hole is negligible. When it's installed, and there's a bolt in the hole, the bolt will flow current also. I would think you could figure the draw as if the hole was not there.
Aldrin, will it be connected to the feet or the testicles of your intended victim? This makes a difference you know, since skin resistance will vary the current flow as well as the rather expensive piece of metal in your picture.
like Jlarson said as a jumper but in this case it'll not to be used. I confuse because the catalog specification for this product state 70A, I'm not sure if they've considered about this hole. I give another picture attached.
are you sure good for 70A? as you know the effective cross section only 6mmsq because the hole present there. please share me if you have the calculation or data to explain that. Thanks before.
You see that (1) beside the copper conductor? If the metal used in your terminal strip is a different kind of metal, then the chart cannot be compared. If the manufacturer has it rated at 70 amps, then I would run it at 70 amps. I've never seen a terminal strip burn it two. It's usually the connections that burn up from not torquing them.
I have news on this, I just got back from a call. There where very similar 70 amp rated Allen Bradley terminal blocks on site and they where running anything from 50 to 100 amps DC through them with no problem.
for an ambient temp of 40-50c
where: A - Cross sectional area of conductor in sq.mm P - Perimeter of conductor in mm.
Will work for AC or DC current.
Or try using ohms law after you find the specific resistance of the material you are working with:
R = ρ(l/A)
Where,
R = Resistance, measured along the conductor's length
ρ = Specific resistance of the substance
l = Length of the conductor
A = Cross-sectional area of the conductor
Follow-up question: algebraically manipulate this equation to solve for length (l) instead of solving for resistance (R) as shown
Metal type - ρ in Ω · cmil / ft @ 32oF - ρ in Ω · cmil / ft @ 75oF Zinc (very pure) 34.595 37.957 Tin (pure) 78.489 86.748 Copper (pure annealed) 9.390 10.351 Copper (hard-drawn) 9.810 10.745 Copper (annealed) 9.590 10.505 Platinum (pure) 65.670 71.418 Silver (pure annealed) 8.831 9.674 Nickel 74.128 85.138 Steel (wire) 81.179 90.150 Iron (approx. pure) 54.529 62.643 Gold (99.9 % pure) 13.216 14.404 Aluminum (99.5 % pure) 15.219 16.758
Make sure you properly calculate the area of the smallest solid portion of the bar around the hole....
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