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When you open the wall, you'll see a wood block running above the wall section. Use a boring drill bit 2.5in (6.4cm) in diameter. Press it against the ceiling plate and drill through it. If there is a floor below the panel that needs cable access, also drill a hole through the floor plate. Measure the distance from an external wall to the hole you drilled. This will help you find where to drill the attic hole if you can't find the point right above the distribution box. Go up to your attic and find the spot directly above where the distribution panel is. Then use the same 2.5in (6.4cm) boring drill bit and cut a hole through the floor plate. Attics usually have double plates, so you may have to drill through 2 blocks of wood to create the hole. If you can't find the distribution point, use the measurement you took when you drilled the first hole. Run your tape measure from the same external wall and find that distance in the attic. Drill at this point. If your attic has loose fiberglass insulation, wear a dust mask to avoid breathing in any particles. While still in the attic, find the areas above rooms where you need cable access. Use the 2.5in (6.4cm) boring drill bit and make holes. The cables will exit the attic through these holes. Go into each room that you'll run a cable to. Then find the location where you want your cable outlet. Then use a ruler and draw a 2in (5.1cm) by 2in (5.1cm) box on the wall. Do this in each room that you need cable access in. If you know where the appliances will be in this room, then mark the holes near this location. Otherwise, locate them near an existing electrical outlet. Check for studs behind the wall before picking a location. Make sure you cut in an area with no studs. Use a drywall saw and cut through the lines you drew on the wall. Remove the square of drywall when you've cut all the way around. Repeat this for every room that you're running a cable into.
Drill a 2.5in (6.4cm) hole through the top ceiling plate. Drill a hole in your attic floor plate directly above the distribution panel. Drill access holes above the rooms you're running cables to. Mark cutting holes in the rooms that the cables will feed into. Cut out the box you drew on the wall.