Ah, i however still dont understand Packets. Can you explain?Nope. Glass fibre cable can handle 512 eu per pulse/packet, not tick.
This means 1 single chunk can not be larger than 512 EU, but you can have a nearly infinite number of those. ( Obviously, computers don't handle infinite so well, so there will be a limit somewhere, it's just not explicitly programmed in. )
So, as long as you don't hook the cable directly to a nuclear plant, lightning rod, or fusion plant...you're fine.