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Electricity And Safety

August 12, 2017 18:07

What are the fire extinguishers used to extinguish electrical wiring ?

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Fire in electrical installations are very dangerous not only because of the fire, but also because of the presence at an emergency site high voltage.That is why the shield to extinguish any electrical equipment you need to start only after complete removal of voltage from the line.But the problem is that it is not always possible to turn off the electricity, especially if the issue of liquidation of failure need to be addressed at the same moment.In this case, you need to be armed in advance and know what fire extinguishers extinguish electrical installations up to 1000V and above this value.Below is a detailed look at this highly controversial issue, which has already been discussed more than once at various discussion forums.

photo Fire

Contents:
  • What does the rulebook?
  • review of existing funds
  • Foam and water
  • Powder
  • Carbon dioxide
  • Summing up

What does the rulebook?

First of all, turn a little to the theory and to give you a set of rules SP 9.13130.2009, which reads as follows:

  1. powder extinguisher can extinguish electrical equipment up to 1000V;
  2. carbon dioxide fire extinguisher may be quenching of electrical voltages up to 10,000 V (10 kV);
  3. If the water vapor content in the carbon dioxide exceeds 0.006%, and the length of the jet fire extinguishing substances less than 3 meters, use carbon dioxide means only to extinguish electrical equipment with voltage up to 1 kV.

seems that everything is clear, but some nuances to consider when putting electrical appliances and electrical installations?This is really something not written in the rule books, or in the SAE.That is why we continue to talk in more detail about the types of fire extinguishers may be used to extinguish the electrical wiring or even shields.

review of existing funds

Foam and water

If the electrical installation is not energized, then with a special permit valid for extinguishing fire extinguishers use of water or foam type (series GP, TOU, RH).This authorization gives the controller the power supply area in which the accident occurred.The reason why the manager must give permission - visible broken cable line that feeds electric ignite.Foam

In other cases you can not use water and foam fire extinguishers to put out the appliance, especially under stress.

Powder

If ignition occurred at the site of the power supply with a voltage up to 1000 V (for example, the electrical fire), it is possible to put out the wiring powder extinguisher.These tools quickly bring down the flames, becausean inert powder layer prevents oxygen from getting to the site electrical ignition.Especially effective fire extinguishers Series OD extinguishing burning insulation in electrical systems.It should also be noted that the powder type products may be used under stress even if it is not higher than 1 kV.

Marking powder fire extinguishers

Carbon dioxide

And the most effective for suppression of electrical equipment and appliances are considered to be carbon dioxide fire extinguishers OU series.The elimination of the flame is due to the low temperature fire extinguishing agent, which will not only bring down the fire, but also to cool the smoldering insulation areas.Because carbon dioxide shortcomings can be noted only harmful evaporation of this substance.It is therefore prohibited to extinguish the electrical installation in confined spaces.

Appearance OC - 2 , OC - 3 , OC - 4

As for advantages over agents such as OP, the following:

  1. Carbon dioxide leaves no residue after evaporation and at the same time does not damage electrical equipment igniting.This is especially important when putting computer equipment or a burning TV.Why, that's obvious.
  2. carbon dioxide fire extinguisher can put out electrical systems with voltages up to 10,000 volts (10 kV).

Summing up

So we looked at what fire extinguishers extinguish electrical installations and electrical equipment.If the question is extinguishing the fire originated at your home, where the voltage may not be greater than 380 volts (0.4 kV), you should turn off the electricity, and then use either powder or carbon dioxide product type.


In the case of extinguishing a switchboard up to 10 kV strongly recommend that the first thing to try to turn the power off, and then moving on to the Elimination of flame hearth.Cases when the quench voltage electrical installations under an accident occurs - human electric shock.One of the reasons for the defeat - arcing of electrical equipment with damaged insulation.

And finally summarize about what the extinguishers can put out the electricity at different voltages:

  1. 400 Volts (0,4 kV) - powder, carbon dioxide, Halon, water and foam (the last two in the absence of power to the emergency site).
  2. 1000 Volt (up to 1 kV) - powder and carbon dioxide.
  3. 10,000 volts (10 kV) - Carbon dioxide.

Worth also view the video tutorial, which demonstrates how to extinguish electrical installations and equipment:

Proper elimination of fire

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