Part B Identify Contact Forms Diagram Possible Contact Forms

Part B) Identify- Contact Forms

Diagram

Possible Contact Forms are as follows:

Table

1) Identify the contact forms for the switches in the diagram.

2) Identify the contact form for the relay in the diagram.

Solution

1) SPST since alarm needs single phase supply to operate so sngle pole switch is needed to operate it.

2)relay may be TPST because all the 3 phases are provided with relay contacts so that for any phase fault it can give signal to relay so that it fires the firing circuit and operates the alarm