Dear Foristas: In a single-family dwelling there are different lines (one for the electrical sockets of the 2nd floor and another for the lights of the 2nd floor) so that if there is a short circuit in the tap line, the light line is connected in that room. So far, all good. The problem arises when it is intended to use a face (R) for the shots and another face (S) for the lights. the case is that the two lines (the one of lights and the one of shots) go by the same pipe. Some people consulted say that they cannot pass two different faces through the same pipe and passage box. I want to clarify that the house has three-phase power supply. The whole house is electric and has no gas installation. All artifacts are electric. Well, the intention of using a line for shots with one face and the line of lights with another face was to achieve the greatest balance between the faces. But hey, the case arises if two faces can pass through the same pipe. I looked for it in the regulations and I could not find an answer to the problem, so if an electrician registered or with knowledge of the regulation can help me I would greatly appreciate it.

Hello Oscar Lines of different phases should not run through the same conduit , this is a serious security flaw, less for a minor issue such as balance of consumption. In distribution boxes, the situation may be different but it will be avoided. In these cases there should be no splices of the two phases, only one. It may happen that in an extreme case that a combination of lighting shares a box with a point of another phase, in that case, the problem will be treated with great care trying to find the best possible solution. This in terms of SAFETY AND WORK TECHNIQUE, the detail or regulatory section I owe you. Regards