How is the tee of the threading tube on the drawing?
The simplest is to use the nose nose to set, do not happen to line nose and cable at the same time do small.
Now generally do not have to calculate, can be used to solve the problem book, find an electrician manual check on the line. First find the wire and cable column, find the required model, how to choose the cable here, and then press the model to find specifications, you can find its cut-off, and finally can be calculated according to the calculation of the electrical manual calculation of the load. (Symmetrical three AC power formula: P = √3 · U · I · Cosφ.)
Your camera's power supply must be connected to the USB power supply (can be used in parallel to the polarity of the voltage to be exactly the same) but not independent power supply, otherwise the system can not identify
