Proper cable shield grounding

Rabbit
1

I hope someone can answer this.

Using a Dallas temp sensor though a shielded 3 conductor cable (DC+, DC- & Data) inside a machine. The cable will run parrallel to other low voltage AC & DC cables. For the remaining end of the cable where the sensor is located it is mounted inside of a small refrigeration system.

Should the shield be grounded only on one end such as the end where it connects to a microprocessor board?

Presently it is grounded at the beginning where it connects to the micro board and then the other end is tied to the DC- at the temp sensor end along with the DC- conductor in the cable. Doesn’t seem quite right to me but that is why I am asking. I think the shield should remain disconnected from the DC- at the sensor. By the way, the DC- and the micro board ground are at the same potential.

Can anyone help here?

Thanks.

2

Cable screens are generally connected at ONE end and DIRECTLY to the appropriate GROUND connection unless otherwise specified by the equipment manufacturer. Regards.