Application specification and function of grounding terminal in motor wiring

November 02, 2022

There are two types of rail-mounted terminals: a wiring terminal and a ground terminal. The role of the ground terminal is for the equipment ground wire, which can make the ground wire have good grounding conditions.
Avoid abnormal connection of the ground wire everywhere to cause abnormal failure of the device, so as to obtain a reasonable line distribution. Supu ground terminal has the same wiring area as the terminal, the color is generally distinguished by yellow-green
The motor should have a device connected to the protective conductor or the grounding conductor. For motors with a rated voltage greater than 50V AC or 120V DC but not exceeding 1000V AC or 1500V DC.
It is recommended to put the grounding terminal in the junction box. The grounding terminal in the junction box mainly plays the role of grounding protection of the shell. For motors with a rated output exceeding 100KW, an additional ground terminal should be installed on the base.
In addition, when the rotor winding of the motor and all bearings are insulated, unless the manufacturer and the user agree to adopt other protective measures, the shaft should be electrically connected to the ground terminal.

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