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| How to wire up a 240VAC receptacle |
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| Spork Schivago:
The three 16-gauge should be fine. The wires that come with the PSU have three 17-gauge. Unless those cords really are made for 240VAC running down L1... How would I calculate the current draw that the PSU will be pulling from the NEMA receptacle for each wire? Would it be 1400 watts / 120 volts or would it be 700 watts / 120 volts? Or would it just be 1400 watts / 240 volts? I'd think not the second, because L1 and L2 will each carry 120V. But then again, we're still dealing with 240V so the current overall shouldn't change....but for the individual conductors, do we treat L1 and L2 as just having 240V total between them and the current draw per conductor (in the physical plug) will be roughly 5.9 amps, or would be roughly 11.7 amps? |
| Spork Schivago:
--- Quote from: IanB on May 19, 2018, 08:05:05 pm --- --- Quote from: Spork Schivago on May 19, 2018, 07:54:27 pm ---Yes, I realize that, and that's why I was really upset when, after my exec talked to the techs, and after the power analysis, they claimed they didn't make a PDU that would power the PSU that worked in North America (which is just B.S. if you ask me). I found an old power cord for a PC. I saved them when I worked on it. Three 16 gauge wires. That should be able to handle the current running through the L1 and L2 of the NEMA L6-30R I'll be plugging it into. Should be hard to wire up. I'd feel a bit more comfortable with 12 gauge wire. I'll see if I can find anymore. --- End quote --- Well the P9S13A can handle 24 amps at 240 volts (5760 W), which is (I think) the maximum continuous load allowed on a 30 amp circuit by the electrical code. So if you need more than 24 amps to run all your equipment you need more than one 30 amp circuit from the breaker panel and more than one PDU. Using a different PDU will not allow you to take more than 5.7 kW from your 30 amp circuit and still comply with code. --- End quote --- Right. We will be drawing more than 5.7 kW from the server, therefore, we need at least 2 PDUs. |
| Bratster:
--- Quote from: Spork Schivago on May 19, 2018, 08:06:59 pm ---The three 16-gauge should be fine. The wires that come with the PSU have three 17-gauge. Unless those cords really are made for 240VAC running down L1... How would I calculate the current draw that the PSU will be pulling from the NEMA receptacle for each wire? Would it be 1400 watts / 120 volts or would it be 700 watts / 120 volts? Or would it just be 1400 watts / 240 volts? I'd think not the second, because L1 and L2 will each carry 120V. But then again, we're still dealing with 240V so the current overall shouldn't change....but for the individual conductors, do we treat L1 and L2 as just having 240V total between them and the current draw per conductor (in the physical plug) will be roughly 5.9 amps, or would be roughly 11.7 amps? --- End quote --- 1400w/240v So just under 6 amps. Sent from my Moto x4 using Tapatalk |
| Monkeh:
--- Quote from: Spork Schivago on May 19, 2018, 08:06:59 pm ---The three 16-gauge should be fine. The wires that come with the PSU have three 17-gauge. Unless those cords really are made for 240VAC running down L1... How would I calculate the current draw that the PSU will be pulling from the NEMA receptacle for each wire? Would it be 1400 watts / 120 volts or would it be 700 watts / 120 volts? Or would it just be 1400 watts / 240 volts? I'd think not the second, because L1 and L2 will each carry 120V. But then again, we're still dealing with 240V so the current overall shouldn't change....but for the individual conductors, do we treat L1 and L2 as just having 240V total between them and the current draw per conductor (in the physical plug) will be roughly 5.9 amps, or would be roughly 11.7 amps? --- End quote --- They don't each carry 120V. There is 240V between them and that is all there is to it. The two wires make the circuit so the current running through them will be equal. You won't be hitting the full power draw anyway. Assemble your lead for this test (only. it won't be suitable for continued use as the breaker protecting it is rather too large), and give it a go. It'll be fine, it'll power up, it will complain about lack of redundant supplies. --- Quote from: Spork Schivago on May 19, 2018, 08:08:18 pm ---We will be drawing more than 5.7 kW from the server, therefore, we need at least 2 PDUs. --- End quote --- I really hope you don't mean one server. Also remember they use redundant supplies and you're very unlikely to draw the full 1400W from a single machine. |
| IanB:
--- Quote from: Spork Schivago on May 19, 2018, 08:06:59 pm ---How would I calculate the current draw that the PSU will be pulling from the NEMA receptacle for each wire? --- End quote --- I posted the specs in the table above (post #208). The nominal current draw at full load at 240 V will be 6.5 A. Look at line 5 of the PSU specification table. However, it won't be running at full load, so the current will be less than this. Any ordinary power cord can carry 6 amps for test purposes. --- Quote ---Would it be 1400 watts / 120 volts or would it be 700 watts / 120 volts? Or would it just be 1400 watts / 240 volts? I'd think not the second, because L1 and L2 will each carry 120V. But then again, we're still dealing with 240V so the current overall shouldn't change....but for the individual conductors, do we treat L1 and L2 as just having 240V total between them and the current draw per conductor (in the physical plug) will be roughly 5.9 amps, or would be roughly 11.7 amps? --- End quote --- I thought we had been through this. There is no 120 V. There is only 240 V. There is no 120 V. It is 240 V. Please try to remember this. |
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