Final answer:
Insulating bushings are used in engineering to prevent electrical current flow through bolts. '14-170' may refer to a specification or requirement for bolt size.
Step-by-step explanation:
In engineering, insulating bushings are commonly used to prevent the flow of electrical current through bolts. When bolts are secured with insulating bushings, the bushings create a barrier that blocks the electrical conductivity between the bolt and the surrounding material. This is especially important in applications where electrical grounding needs to be restricted, such as in sensitive electronic devices or high-voltage equipment.
The phrase 'Bolts through insulating bushings are to be (14-170)' could be referring to a specification or requirement related to the size or dimensions of the bolts being used in a specific system. The numbers '14-170' could correspond to a particular range or standard for the bolt size, which would need to be determined based on the context of the question.