12 terms

HVACR ELECTRICAL-CMS, 6 of 14, Electrical Safety

In preparation for RSES CMS Electrical exam. This is the 6th, in a series of sets, totaling 14 sets in all, that will prepare the student to pass the CMS Electrical exam. It is patterned off the outline for that exam as released by RSES, and deals with each knowledge area exhaustively. The material is taken from RSES study manuals only, so that the questions found in these sets are RSES material specific, giving the student a better then average chance to pass the exam successfully. It is sugges…
List the three general types of hazards associated with electricity.
Electric shock, Burns, and related accidents caused by a shock.
When you use electric power tools, you must be sure that they are
____________ or __________ tools.
Grounded or double-insulated.
When is it permissible to use improperly sized fuses?
The severity of an electric shock depends not just on the amount of
Current that passes through the body, but also on the __________ and
the ___________.
Path the current takes and the duration of the current flow.
An electric shock of as little as _______ mA can cause the inability Of the victim to "let go" of the circuit.
The condition marked by the rapid, uncoordinated twitching of the heart muscle, resulting in a lack of circulation and pulse, is known as _____________.
Ventricular fibrillation
What should you do if the victim of an electric shock is still in contact
With the electrical source?
Turn off the power first, if possible, or move the victim away with a piece of some dry, nonconductive material.
What color is the hot wire in an electric circuit? What color is the neutral Wire? What color is the grounding wire?
Black or Red, white, green
How does a ground fault circuit interrupter work?
It senses a imbalance of current flow between the hot and neutral wires, which indicates current flow from hot to ground. This imbalance opens the circuit breaker before current reaches dangerous levels.
After you have notified the appropriate personnel that you will be Working on a piece of equipment, what are the steps that you should follow to complete the lockout/tagout procedure correctly?
Turn off the power, and attach the lock out device to the circuit breaker or disconnect switch.

Put your own padlock on the lock out device and lock it with your own key.

Tag the equipment with appropriate warning signs, stating that the equipment is not to be energized or operated and that locks, tags, and other safeguards are not to be tampered with or removed.
Electrical fires are classified as _____________ fires.
Class C fires
What type of extinguishing agent is normally used to fight electrical fires?
Carbon Dioxide ( CO2 )