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Unit 18 Residential Wiring Book Questions with correct Answers
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Unit 18 Residential Wiring Book Questions with correct Answers
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Unit 18 Residential Wiring BookQuestions with correct Answers
In most cases, what two cables are required to be field installed by the electrician to a
gas or heating system? - Answer -Installing the low voltage LVT cables from the
thermostat to the gas/oil heating system location.
Where does the CEC require that a disconnecting means be installed for a gas furnace
or boiler? - Answer -Breakers are a suitable disconnecting means as long as a person
can reach it without having to walk past the furnace.
What device in an oil-burning system will shut off the burner in the event of a flame-out?
- Answer -Primary control?
Name the control that limits the temperatures in an oil-fueled boiler. - Answer -Water
circulating pump?
Name the control that limits the temperature in the plenum of a furnace. - Answer -High
temperature limit control.
In the wiring diagrams in this unit, are the safety controls connected in series or
parallel? - Answer -In series?
What is meant by the term "self-generating"? - Answer -Systems that do not require an
outside power supply connected in series, supplied by a thermopile.
Because a self-generating unit is not connected to an outside source of power, the
electrician need not use care in selecting the conductor size or making electrical
connections. Is this statement true or false? Explain. - Answer -No, the electrician must
ensure that they use extra low voltage cable for the self generating unit to the
thermostat.
Explain what a thermocouple is and how it operates. - Answer -In systems that have a
standing pilot, a thermocouple holds open a gas valve pilot solenoid magnet.
Thermocouples consist of two dissimilar metals connected together to form a circuit,
when one junction is heated an electrical current flows.
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