PVC insulated power cable GB/T12706-2002 national standard.

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Q: Suppose load is 100KW, length 50m, how to calculate cable size. If we know current Is any easy mathod to calculate cable size.: There are two issues to consider, cable heating and voltage drop. Of the two, voltage drop is by far the easiest. You need to determine what the allowable voltage drop in you cable is. The voltage drop is just I x R where I is the current and R is teh round trip cable resistance. The specification of 100 kW isn't enough. If its a high tension 100 kV line, the current is only 1 amp and a run of 16 AWG wire would deliver about 99,999 volts out of the original 100,000 volts to your load. If its a 100 volt system then a 4 AWG wire would only deliver only 20 volts to the load. The formula for wire resistance (in AWG) is that 10 AWG has 0.001 ohm/ft. Each increase of 1 in the gauge increases resistance by the cube root of 2 (about 25%). You calculate by picking what voltage drop you can live with, for the known current figure the resistance, knowing the length figure the resistance per foot, and then pick the AWG using the above. The second concern is wire heating. Although you could do the heat transfer calculations, instead look up the allowable ampacity for any wire in an electrical engineers or NEC handbook.

Q: Is it safe to connect the case fans in line with the hard drive, or should I use a separate power cable?: If it's a newer motherboard and case, there should be jacks on the motherboard itself for the fans . It should be safe yes. There are minute reasons why you might not want to, but the odds of interference or power supply variance are quite remote.

Q: my mac is fairly new, but is not charging. Are mac power cables this bad?..does anybody know if they need to be replaced often?: It does happen quite often. Mine got damaged for no reason, guess is the weak link in your mac

Q: when you install a power cable you usually route it through the door seal and under the carpet. If there are existing speaker wires that go to your rear speakers, will the power cable create an interference?: General rule is to keep power wires and wires that run sound signals separte. I always run my power and remote wires on one side of the car and speaker and rca wires on the other side of the car.

Q: I'm 1000% positive that it's not my monitor's problem.: I have to agree you shouldnt touch this if you dont know what your doing, check everything again, and make sure all cables are in correctly including your ide, or sata cabling. Take out the ram stick and put back as this is usually why nothing shows. Take a look at link for more help and info

Q: I'm trying to install a GeForce GTX 460. It came with a supplemental power supply cord, one end goes into the card, and there are 2 heads on the other end, and i can only find 1 place to plug in a single head into my power supply... When i turn the computer on the fan on the card turns on so i assume enough power is being given to the card, yet when i log in and put in the Installation disk, it says quot;not foundquot;... i already locked the card in, and i tried re adjusting the card multiple times but that doesn't do anything so i'm sure putting in the card incorrectly isn't the case. help! :(: You are taking a chance of burning up your PSU and your card. The card might perform ok under basic desktop situations, but when you try to game it is going to drain your PSU for all the power it can get and probally fry the +3Volt rail that the single molex connector is on that you pluged the PCIEx16 6pin pigtail up to. This might even cause a short of your motherboard and or ram on the motherboard, and could even lead to a frying of the CPU as well. Or maybe not, just a chance you are taking...

Q: Hello, i have a quick question, this card doesn't need PCI cables right?My power supply is 450 wattNVIDIA GTX 750 TI is the cardThank you: It does need power cables. Your PSU should come with them. That's all the cables it needs.

Q: Hi, I have a router connected to the internet, but one of the computer is 80 feets away from the router and it can not get 100MBps. I have force the computer to use 10MBps. Could someone please let me know what will impact the speed of cat5 cabling?: Ok, please note the following: MB/s = MegaBYTES per second Mb/s = MegaBITS per second 10MB/s = 100Mb/s (roughly) Your router and NIC card is 100Mb/s (unless they are both Gigabit - Gb/s which will give you roughly 100MB/s in speed assuming both the NIC and router can support that speed.) I hope this answers your question.

Q: What is the distance between the power cable and the thermal pipe when it is laid above the thermal pipe?: Cable and 10kV power line parallel laying the minimum distance of 0.5 meters.

Q: so my old psu fryed itself, and i just ordered a new one, i have another psu that i can use but its only 350 watts, it has no gpu connector, can i still use my computer without the power for the gpu, i have no onboard video and i have a radeon hd 6850 256 bit gddr5. and my cpu is a amd phenom 2 x6 (six core) 1045tthankyou: Please note HD 6850 is a high end gfx card and requires 6 pin power connector. if you want to fry you mobo - then use gfx card without 6 pin power!!!? while running the gfx card will try to take power fm mobo and that time to give support to gfx card your mobo will fry for sure. thanks

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