The specs on the Niagara 1200 show max power input is 15 Amps. This can be handled by regular 14 AWG wiring. Putting a firehose sized cable between the outlet and the N-1200 will not provide any additional current to the device. It simply doesn't draw more than 15 amps. The N-1200 appears to be the only Niagara conditioner without Transient Power Correction, a stored reservoir of current to handle momentary spikes. However, the majority of amps draw a small amount of power when running. 1 - 3 amps is pretty common. The chances of needing more than the 15 amp supply going into the N-1200 is remote. The bottom line is this. If the N-1200 does what it claims, then any reasonably built cable, 14 or 12 AWG, is going to do the job. If you have a burning desire to spend $$$$$, buy a much better power conditioner. IMHO