Detailed explanation of the main causes of electric heating belt fires

Detailed explanation of the main causes of electric heating belt fires

As is well known, electric heating strips are a type of constant temperature air heater manufacturer, which improves the convenience of insulation heating during the production process. The installation of electric heat tracing strips is divided into laying electric heat tracing on the outer wall of the equipment, distribution system of head and tail junction boxes, and external insulation layer. When installing electric heat tracing cables, they should be installed and constructed according to the prescribed construction specifications. Otherwise, due to improper installation, safety accidents such as short circuits, electric leakage, and fires may occur during use, causing serious safety hazards. Today, air heater manufacturers will briefly analyze the reasons for the fire at the end and middle of the electric heating strip. If you don't understand, let's take a look!

The main reasons for the fire at the end of the electric heating strip are as follows:

1. The tail end is a sealed part. During the installation process, it is necessary to install a rear junction box for sealing. It is strictly prohibited to leak from the tail of the electric heating belt. The junction box is not installed. After the tail is damp, it is easy to cause short circuits and fires.

When installing the terminal box, the outer sheath and shielding layer should be peeled off. It is strictly prohibited to connect the electrical shielding layer to the terminal box. If the shielded network is connected to the junction box, it will cause the circuit to ground. In case of poor grounding protection contact, it is easy to generate electric sparks and cause fires.

3. The thermal expansion and contraction of the tail insulation layer expose the conductive part, causing leakage and fire in rainy, snowy, and humid environments.

4. Using absorbent insulation tape can cause moisture at the tail, leading to leaks and fires.

An analysis was conducted on the causes of fires in electric heat tracing belts:

During the installation process of the electric heating strip, the finished product was not protected, stepped on, dragged, pulled, or twisted, resulting in deformation and damage to the internal wire core of the electric heating strip. The general construction situation is very chaotic. Even sturdy fluoroplastic jacketed electric heating strips can easily be cut off without attention. Under long-term high-power and high-temperature operating conditions, damaged wire cores are subjected to uneven heating, resulting in local high temperatures and triggering fires.

2. The outer sheath of the electric heating belt is damaged, and the wire core leaks, resulting in a short circuit of the wire core in rainy, snowy, and humid environments.

After consulting a large amount of data, Xiao Bian found that there is another situation that can easily cause a fire in the middle of the electrical tracking belt, so I will add it again. If the insulation layer of the electric heating strip is not waterproof, it is easy to water in rainy and snowy weather. Water flowing into the insulation layer will cause some of the heating lines to be in a low temperature or humid state, and operate at a higher output power. This will cause local electrical overload, uneven attenuation rate, excessive local current in the electric heating belt, leading to internal fire short circuit and electric spark, thereby causing ignition in the middle of the electric heating belt. If we want to avoid such accidents, it is not difficult. We only need to waterproof the insulation layer of the electric heating strip.

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