Choosing the right power cord for my PC adapter
The input of 3.5A will only be taken with the lowest input voltage. At 240v, you will be drawing less than 2A. 

Ideally, you'll fuse your mains input at 3A, which although it's a common standard, it can be difficult to find other than 13A fused UK power cords. If you have to buy a 13A cord, then also buy some 3A fuses, and change the fuse.