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  1. Hi Guys,  It might be an off topic, but I need some help, with motor sizing. I have to choose a Sew motor with a proper gearhead. I made the calculation, for the speed thats okay. But I got stuck with the loads. It will be a conveyor, the roller and the product mass altogether is 29 kg. I  made the calculation for the load inertia check: Roller moment of inertia (J1);    m2=mass of roller;     d=diameter(mm) J1=1/8*m2*d^2*2=1/8*8*0,2^2*2= 800 * 10^-4 kgm^2 Belt and material mass = m1 = 21 kg;  Belt and work moment of inertia (J2): J2=m1*( π * d)^2/4* π ^2= 2100 * 10^-4 kgm^2 J=J1+J2 = 2900 * 10^-4 kgm^2 They give me a motor with gearhead, sew eurodrive Ka37/T DRS71S4BE05. This motor performance is 0,37kW, I think its enough, but on the documentetion, I didn't find any data, about the permitted load inertia. Can anybody help me with this ? Thanks ahead.            
  2. Hello, I want to ask for a second opinion regarding sizing infeed wires and cables. Take this case for example: 5G16 incoming supply cable (400VAC 3PH+N) to a panel which goes through a MCB and then to a potential distribution block. From there on i can feed various supplies: 1 off 30A Inverter (4mm wire) 1 off 15A Motor (1.5mm wire) 1 off 24VDC PS (2.2A) (1mm wire) The wires from the potential distribution block to the MCP (inverter / motor) an MCCB ( PS)  do they all have to be the same size as the highest consumer? This case inverter so 4mm?   Thank you.