TB 13 - Electric Radiant Heat Flashcards
What has become a common type of heating system for building in LA?
Electrical radiant heating
What is installed in loops throughout an area and connected to thermostats which control the amount of current flowing through wires?
Cables
The power supplier to the thermostat comes from the building circuit breaker panel and may be as high as how many volts?
220 volts
What will carry with the installation (current and power)?
Amperage and wattage
What is concealed in construction by covering with dry wall, plaster, or cement?
Heating wires
The loops of wires are commonly installed on what features of the building?
Commonly in ceilings, may be found in floors and walls
When the heating wires are installed in a number of rooms such as a residence, thermostats are provided for each room except for?
Bathrooms and halls
Per which chapter and article of the Los Angeles municipal code required thermostats to be installed so that there is no possibility of current flowing through the system when thermostat is turned off?
Chapter 9, article 3
A malfunction or mechanical injury to the system may cause what resulting in a common electrical fire?
Short circuit
What type of hazard is present if the energized conductor is exposed, or ceilings or walls are pulled that contain energized heating circuits?
Electric shock hazard
During firefighting operations, what are the 2 obvious problems with the electric radiant heating system?
Ceilings and walls containing circuits may be pulled jeopardizing fireman’s safety
May be difficult to locate proper service box to de-energize the system affected
For buildings that have electric radiant heating, do not cut into what until circuits have been de-energized?
Ceilings or walls
When fires occur in occupancies known to have electrical radiant heating systems, consider de-energizing the building by use of what shutoff?
Main electric shutoff
