Fire and Smoke Alarms

There is certainly more than one queen in the world, some of whom have fire alarms and some of whom do not.

Pool alarms can be a very important feature for your pool, and a safety one also. It can be life saving. If a child, pet or anyone for that matter would fall into an unsupervised pool, the alarm would sound notifying you of these and allow to run to pool to save whoever fell in, saving you a lot of future heartache and worry.

A non significant quantity because the half life of americium is 432,2 years.

To detect if there was smoke in a abuilding so that everyone inside can know there is a fire and get out.

Depends. Most fire alarm panels have delay overrides in them so maybe when the fire alarm initially gets triggered, it waits a few minutes/seconds while the person investigates the cause of the alarm. Once the time is up, the alarm sounders/bells automatically start activating.

In some other cases, you could have a class change feature in which the panel is programmed to sound the fire alarms at a certain time in the day- for example, class change in a school, the fire alarms produce a signal from the panel to signal class change.

By connecting smoke alarms together, triggering one will trigger the others, resulting in a better chance that everyone in the house will hear them going off and get out safely.

Assuming this is a question about a smoke detector:

1.The sensor can be obscured with dirt and/or dust

2. An insect such as a spider may have be obscuring the sensor. Sometimes you will even find a web inside the detector.

3. The detector may be defective.

4. The battery, even though it has been changed, may provide too low a voltage to the device. Make sure the battery itself is OK.

When we discuss fire panels and "nominal" voltage on a circuit we must first determine what type of circuit. Addressable panels can have varied circuits that all perform different funtions. The two most common are Notification Appliance Circuits (NAC), and Signaling Line Circuits (SLC). "Nominal" should be replaced by different terms. "Monitoring voltage", and "Active Voltage" to be substituted for NAC circuits, and "intializing voltage" and "polling voltage" for SLC circuits. Monitoring voltage for NAC circuits vary, however it commonly either between 2-4vdc, or -24vdc. Once a NAC circuit is activated "active voltage" it is almost always 24vdc. "Intializing voltage" on a SLC circuit is caused when a circuit is first plugged into its associated board and the voltage "spikes" to 24vdc then settles at its "polling voltage" at either 24vdc or between 12-18vdc.

1. It is a crime, you could be fined or sent to jail.

2. If anyone gets hurt, you can be sued as well as being fined and sent to jail.

3. Any false alarm costs money, you could be required to pay for the wasted time.

4. False alarms can delay response to an actual emergency, causing damage and injuries to be worse than if the fire department had been there earlier.

5. Repeated false alarms are annoying and people will start to ignore the alarms, meaning they can be hurt if there is a real alarm later and they do not react quickly enough.

6. There may be rules at the school or at the office that prohibit false alarms and you could be expelled or fired from your job.

7. Any 9-1-1 call, especially a hangup call, is assumed to be an emergency until it can be proven otherwise and it could tie up emergency responders while they try to track down the source of the call to make sure nobody is in danger.

The xenon tubes used in fire alarm strobes are typically rated for several thousands of hours of operation. Given that these strobes rarely operate for more than a few minutes at a time, and usually only during testing, anywhere from annually to monthly, the expected life would be for many years. It is much more likely that a building's strobes would have to be replaced due to legal requirements such as fire alarm or ADA codes changing than due to the device itself wearing out.

On a city rail train, the consequence of pulling a fire alarm for no reason, is a fine of $200

It used to be Selenium, but modern photocells use silicon (Si).

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Mildred initially called the fire alarm about Montag.

Yes, of course. If there is an "unscheduled fire," you would naturally want everyone to respond the same way they do during an unscheduled fire drill.

Some fire departments require advance notice when a school is going to pull a fire alarm for anything other than an actual fire, but there is no particular requirement to pre-announce a fire drill to anyone inside the school.

Many elevator systems are extremely vulnerable to smoke and fire and any cars are automatically sent to certain level, usually the ground-floor lobby during a fire alarm, where they will remain unless activated by a "firefighter's key".

One reason for this is to reduce the chances that occupants will become trapped in an elevator during a fire, such as when a fire in a lobby area "calls" the car to the floor of the fire, opens the doors when it gets there and injures the occupants.

In some cases, specially designed and labeled elevators may be used during a fire situation for purpose of evacuation, rather than total reliance upon stairways.

Americium (241) is used in smoke detectors that use "ionizing radiation" to detect changes in the air. Other types of detectors use photo-electric sensors based upon a variety of photo-sensitive chemicals.

A special sensor or transducer called a thermistor is used to detect an increase in the temperature of the surrounding air whenever smoke is produced by a fire. A different type of sensor is used to detect an increase in the size and density of particles in the surrounding air after it has been contaminated by smoke from a fire.

Either sensor gives an output in the form of an increase in voltage whenever it detects an increased temperature and/or smoke particles. That increase in voltage is fed to the base of a transistor. When the voltage to its base increases, the current from the transistor's emitter to collector (or from its collector to emitter) increases and that increase in current operates the alarm. In other words, in a fire alarm circuit, the transistor acts as a switch which turns on the alarm whenever a sensor or transducer detects the presence of a fire, else it remains off.

You should have a photo-electric smoke alarm in your house because they react more quickly to smoldering fire byproducts than most ionizing type smoke alarms.

Having ANY type of smoke alarm is better than none, provided it has the necessary batteries and maintenance to actually work during a fire.

There is no penalty, provided you are signalling an actual fire.

There are two main types of wireless house alarms. One is the perimeter protection wireless house alarm and the other is the motion detector wireless house alarm.

Some smoke alarms beep when the power goes out because they are hardwired to the power system and resetting. Not all smoke alarms are hard wired to the building's electrical system.

As far as I'm aware there's no law to stop you covering up your drain. The reasons people generally don't is if there is a blockage, remember if you neighbour blocks their drain this will be passed through the 'run' (means the line of drains running to the sewage) to your drains.

At this point when the Council who are generally responsible for helping resolve not fix but resolve drainage problems will be unable to get to your drain. When there's a blockage a drain clearing company normally send a camera down the run to check where the blockage is and if this stops at your property, along with the other residents on the run you will be responsible for clearing the block, if your drain covered it can make it really difficult. As far as I'm aware there's no law to stop you covering up your drain. The reasons people generally don't is if there is a blockage, remember if you neighbour blocks their drain this will be passed through the 'run' (means the line of drains running to the sewage) to your drains.

At this point when the Council who are generally responsible for helping resolve not fix but resolve drainage problems will be unable to get to your drain. When there's a blockage a drain clearing company normally send a camera down the run to check where the blockage is and if this stops at your property, along with the other residents on the run you will be responsible for clearing the block, if your drain covered it can make it really difficult.