My father in laws garage. The pipe work was done when the garage was built. Lights in the garage include a PIR for outside lights. The 3 core clipped to the wall runs to an additional PIR wired in parrelel to existing, installed a couple years later. The cable could have easily been added into the conduit, but they decided to do it this way. Drilled through the pillar, not clipped around it. There’s half a brick missing on the other side. Btw, I wasn’t living in the area when the garage was built, so he had to go with the builders electrician.