When should you use a piece of pipe as a leverage extension on the handle on a wrench?
a. as necessary to increase torque to loosen a stuck bolt or nut.
b. only on approved torque multiplying wrenches.
c. only if the pipe is less than 4' in length and is made from galvanized ridge conduit (grc) or intermediate metal conduit (imc).
d. never use a piece of pipe as a leverage extension on the handle on a wrench.