What the role about the conduit box

When the straight length of the tube beyond 15 meters, or the wire tube has 3 turns and the length beyond 8m, the junction box must be installed in halfway,now we can use through or angle box. Because it’s easy to check the wiring.

Tee box and Intersection box are also play role of connection.As the name implies,Tee box can connect 3 ways of pipes and Intersection can connect 4 ways.