The low water cut-off of a low pressure steam heating boiler should be tested
a. By electrician who specializes in boiler controls
b. By lowering the water level, and ensuring the boiler shuts off before the water reaches the bottom of the visible part of the gage glass
c. Several times per shift
d. For correct operation on an annual basis
e. By first shutting off the burner, to prevent boiler damage if the cut-off should fail during testing.
Answer: B