If you are struggling to drill into switchboards, try out Multi-Cut Drill Bits.

The Multi-Cut Drill Bits are Made in Europe & have a sharpened tungsten cutting tip. 

Most tungsten drill bits have a negative cutting tip & the drill bit relies on the hammer action of the drill to drill a hole. The Multi-Cut Drill Bits have a sharpened tungsten cutting tip which means they cut the hole with requiring the hammer action. 

Being sharpened tungsten, these drill bits drill through concrete, brick, tiles, timber, steel, & FC sheet including the new switchboards.