What are the 3 main types of fire alarms?
The three most common smoke detectors are ionisation, photoelectric, and combination ionisation/photoelectric. All smoke detectors sound an alarm, when they identify smoke, in order to notify a building’s occupants. What differentiates these detectors from one another is the way that they detect smoke.
What are the two basic types of fire alarm systems?
There are two main categories that fire alarm systems fall under: manual and automatic. A manual system requires the attention of a person to activate it (a lever at a pull station), whereas an automated system is triggered automatically (via smoke or heat detection).
What is a Class 1 fire alarm system?
The Code states that remote-control circuits for safety-control equipment is to be classified as Class 1 if failure of the equipment to operate introduces a direct fire or life hazard. Similarly, fire alarm system wiring does not fall into this category because it does not introduce direct fire or life hazard.
What is a Class 2 or 3 circuit?
Class 2 and 3 circuits are defined as the portion of the wiring system between the power source and the connected equipment. Class 3 circuits limit the output power to a level that usually will not initiate fires. But, they can and do operate at higher voltage levels and, therefore, can present a shock hazard.
What is a Class 2 power unit?
Class II (with Roman numerals) refers to power supplies with either a double or reinforced insulation barrier between the input and the output. Class II supplies do not rely on an earth connection to protect against shock hazard. Many cell phone chargers and laptop power supplies are Class II.
What is Class 2 and Class 5 conductor?
Class of conductor refers to the flexibility required for an application. Class 2 is used in cases where the installation is fixed and they are stranded conductors. Class 5 refers to a flexible conductor. The core of class 5 conductor has a number of thin wires than class 2 to make it more flexible.
What is class B stranded wire?
CLASS B: Power Cables. CLASS C: Power cables where more flexible stranding than Class B is desired. CLASS D: Power cables where extra flexible stranding is desired.
Which class of copper wire is best?
- Beryllium Copper Wire has the advantage of copper’s high strength combined with non-magnetic and non-sparking qualities.
- Copper alloy wire is available in standard and customized form factors.
- Copper clad steel (CCS) wire combines the conductivity of copper with the high tensile strength of steel.
Are conductors?
A conductor is a material which contains movable electric charges. In metallic conductors such as copper or aluminum, the movable charged particles are electrons. Positive charges may also be mobile, such as the cationic electrolyte(s) of a battery or the mobile protons of the proton conductor of a fuel cell.
What are 3 types of conductors?
Types of Electrical Conductors
- Hard Drawn Copper Conductor.
- Cadmium Copper Conductor.
- Steel-Cored Copper Conductor (SCC)
- Copper Welded Conductor.
- Hard-Drawn Aluminium Conductor or All-Aluminum Conductor.
- Aluminium Conductor Steel Reinforced.
- Smooth Body ACSR Conductor.
- Expanded ACSR Conductor.
What are conductors for Class 6?
CBSE NCERT Notes Class 6 Physics Electricity and Circuits. Materials which allow electric current to pass through them are called conductors of electricity. Examples are iron nail, key, safety pin, water, human bodyetc.
What is a battery class 6?
Battery: When two or more cells are joined together, the combination is called a battery. Bulb: We get light from a thin tiny wire inside the glass cover. This is called filament. The base of the bulb and the metal tip of the base are the two terminals of the bulb.
What is meant by a battery class 7?
Battery – A battery is a combination of two or more cells combined in series to produce higher electricity. It is used in applications where more electricity is needed like torch, toys, UPS, Car etc.