Recent content by Babadag

By the way, even overhead line presents insulation: the insulators and the air. However, if the heat is evacuated by conduction in cables in the overhead line it is convection and radiation the evacuation way. The conductor temperature is limited by metal mechanical properties since annealing...

If you speak about conductors and not about cables you are right. However, in order to connect equipment with air transmission line you need cables, usually. The access to equipment has to be insulated. Of course, there are high voltage equipment connected directly to transmission line but there...

First, you are limited by what it is called “ampacity”-in USA-or current carrying capacity in IEC. The current running through conductor produces losses as was stated above. The losses turn into heat, and the heat arise the temperature of conductor. Each conductor is covered by insulation. If...

I agree with Tom.G First, in my opinion, CR 2032 supplies 3 V and Led strip requires-5 to 24 V -depending on type. The load current for LED strips may be 2400 to 7200 mA but CR2032 capacity it is only 235 mAh that means 235/3600=0.06528 mA that means if itsupplies a 0.06528 mA load the voltage...

The balloon up speed is 4 m/s constant. Then the space up to the point of return of ball it is 4*t. The total space of the ball is (4+1.2)*t-9.8*t^2/2

I think SKM presents more details.

However, the IEC capacities remain more than IS values [after change the ambient to 40oC]. For conduit run by 15% and 6% for free in air.

I checked the ambientes and for IS standard is 40oC but for IEC standard it is only 30. In this case both standards present the same current carrying capacities but at different ambient.

Flamegard is a PVC insulation material tested according to Indian standard IS as insulated with FR-LSH Grade PVC. Insulation thickness it is less than in IEC 60502-1 for PVC/A insulation. The conductor resistance [d.c. 20oC] it is as per class 5 in IEC 60228 for plane copper. However, the...

By the way, MJF PA12 Nylon parts have good temperature resistance. Thick parts will remain dimensionally stable in temperatures close to 175 °C, while thin parts will start to soften and lose their shape when temperatures exceed 95°C. So if FEP layer is at 200oC then MJF thin layer will melt indeed.

If the all 4 wires are in parallel and the maximum total current it is 57 A then in BN will be 3.3 A and in TC 25 A and the temperature of conductors will be 200 dgr.C However, it is for single cable only.I don’t understand what is the number total of the cables and what is the running...

Referring to #15, if we take only the strands in the parentheses BN (7*12/44) and TC (7*38/40 ) then the diameters are match with D1 and D2. However, TC is indeed 16", but BN it could be 25. BN presents 30.87 ohm/1000 ft and TC 4.057 ohm/1000 ft at 20oC [DC]

According to #8 D1=0.042; D2=0.08; D3=0.165 However, if we take at BN 22(7x12/44) 155 strands[ actually there are only 154] one strand is 12*(44 awg) 4.3* 0.00200"=0.0086" diameter and 12*4=48 cmils 7 strands=3*0.0086=0.0258" diameter and 7*48=336 cmils 22 of 7 strands=5.8*0.0258"=0.14964"...

Sorry, I don’t see any 16 awg copper conductor. First, there are total 4 cables. No one is 16 awg [22*(7*12/44)=3.696 mm^2 and 16*(7*38/40)=20.8544 mm^2) and 16 awg it is 1.30-1.43 mm^2.