The following wiring diagram shows the installation of a 150A subpanel for 240V only. Wiring Installation of a 150A Subpanel for Only 240V How to Wire 277V & 480V, 1-Phase & 3-Phase, Commercial Main Service Panel?.How to Wire 208V & 120V, 1-Phase & 3-Phase Main Panel? Distribution Board Wiring.a single switch should control the ON/OFF operation of both 1-Poles breakers) Also, 2 Single pole breakers can’t be used for 240V appliances unless the ON/OFF button is bonded (i.e. a 240V, double pole breaker can only be used for a single appliance.The links are given in the instruction NOTE (below this post) for sizing the breaker, wires, switches and outlets etc. NEC does not allow the use of a 30A breaker for 20A outlets and switches etc.They only can be switched off by pulling the energy meter or safety switch between main panel and energy meter. The main breaker lugs are always Hot no matter if the main switch is OFF or ON.for different applications such as Indoor & outdoor (weathertight). There are many types of main and sub panels by different manufacturers such as Eaton, Schneider, ABB, Siemens etc. Moreover, two separate GFCI breakers should not be used for the same circuit to prevent the unwanted tripping conditions. In addition, Neutral in the subpanel is only needed when there are 120V circuits or GFCI circuit breakers/outlets. Keep in mind that there is no need to bond Ground with Neutral in the subpanel (as they are already bonded in the main panel). The subpanel is fed-up by 2-Poles, 240V breaker at the main panel via two hot wires (L1 & L2), a Neutral wire “N” and Ground wire “G”. it provides protection against surges, electric shock and other electric faults.
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