First off, each L3 pulls around 900w so a Delta 2400w PSU wont be nearly enough to power all 3.
Second, the number of outlets is meaningless for what you are asking. You need to figure out which plugs share a circuit so you do not overload that circuit.
Rather than wasting money and electricity on a step up converter you can just run a single 1200w PSU to each machine and run it off 110v.
Hey Fanatic26! Thank you for the prompt reply! Does this mean I can use one outlet output per Antminer? The reason I ask because I don't want to exhaust all my plugs since I also have my desktop computer and monitors set up on 3 of the plugs so I'm down to 4 plugs out of the 7 available. And since the single plug is on the left wall it may be on a different circuit. How would I find out if it's on a different circuit if I don't have access to the breaker since my office is a commercial leasing space? As for the Delta 2400w PSU it rated on PrallelMiner.com as capable of running 3 Antminers L3+ according to their site:
$229.00
Delta 2400 watt server power supply. HE ~ Platinum High Efficiency at 94% capable of powering 3 Antminer L3+ Miner. Power supply kit includes proprietary (2) X-Adapter REV:7 , set of (24) 26inches PCI-E 16AWG, (3) PCI-e splitters and (4) heat resistant rubber foot pads.My best option theoretically is to run them via Step Up converter to 240v on that line single outlet. But I'm all ears to any suggestions. Right now I'm headed towards your direction Fanatic26 and possibly lose acces to the other outlets?
What else can you suggest if I have 3 Antminers, PC with 2 monitors on a 850 psu and a 2 mining gpu mining rigs with each running about 1600w PSU's? With only 7 outlets?