Cover type electric heating element

Cover type electric heating element

This type of component involves placing an electric heating wire in a cover, and the common forms include (a) and (b) in the following figure:

Closed tubular electric heating element

This type of component, commonly known as an electric heating tube, is a closed system in which the electric heating wire is placed in an insulating and thermal conductive material

Electrical appliances and electrical circuits can both be live. According to the on-site conditions, those that are allowed to be powered off should be powered off to extinguish the fire, while those that cannot be powered off should be powered on to extinguish the fire.

(l) When electrical appliances and circuits catch fire, if the power supply is not cut off in a timely manner, the fire extinguisher's body or handheld firefighting equipment may touch the live parts, causing electric shock; Electric shock may also be caused by using conductive extinguishing agent, such as DC water column from water gun and foam from foam extinguisher; After a fire occurs, electrical appliances and electrical circuits may leak electricity due to insulation damage, and wires may break and ground, causing the metal shell of the appliance, the normally uncharged metal frame, to conduct electricity with the ground, and thus leading to the danger of contact voltage or step voltage shock.

Therefore, after discovering a fire, the first thing to do is to cut off the power supply. Pay attention to the following points when cutting off the power supply

a. After a fire occurs, due to moisture, smoke, or high temperature baking, the insulation capacity of the switch electrical appliances decreases. Therefore, insulated tools should be used to open the switch according to the situation.

b. When an electromagnetic contactor is installed online, the electromagnetic contactor should be opened first, and then the switch should be opened to avoid causing arc short circuits; When equipped with a sub switch and a main switch, it is advisable to first disconnect the sub switch and then disconnect the main switch.

C. When cutting wires, wires of different phases should be cut at different locations to avoid short circuits when cutting wires; When cutting aerial wires, the cutting position should be selected near the support object in the direction of the power supply to avoid short circuits and step voltage electric shock accidents caused by the wire cutting and falling off

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