Electrical fire protection in chemical laboratories (1)

There are many electrical facilities and instruments in the chemical laboratory, and electrical accidents occur from time to time, mainly electrical fires and human electric shocks

Electrical fires are various, mainly caused by short circuits, short cuts, poor contact, small wire diameters or overloads, cluttered lines, and no safe distance

One, short circuit

A short circuit is a phenomenon in which the wires in the electrical circuit cause the connection of the phase line and the phase line, and the phase line and the neutral line (earth line) due to various reasons, causing the current in the loop to increase instantaneously

Second, take shortcuts

Laziness and opportunism are extensions of the basic properties of nature.

Figure 9-1 Voltage regulator burned out due to short circuit between traps

3.

Poor contact due to oxidation, looseness and other reasons, as well as poor contact of the power plug, etc.

Fourth, the wire diameter is small or overloaded

When electrical appliances are designed or used, the wiring arrangement of many electrical appliances does not fully consider whether the wire diameter meets the future load requirements.

Figure 9-2 Voltage regulator burned out due to poor contact

Figure 9-3 The circuit (a) and the voltage regulator (b) that were burned due to small wire diameter or overload

Connecting multiple high-power electrical appliances to the multi-jack terminal board, as shown in Figure 9-4, may also cause heat and fire and burn, which may cause a fire

Figure 9-4 Connecting multiple electric appliances with human power on the terminal board

Five, the line is messy

There are many electrical appliances in chemical laboratories and analysis laboratories, and the wiring is messy, which breeds safety risks, as shown in Figure 9-5

Figure 9-5 Disordered line distribution

(1) If electrical appliances have more wires, they will appear messy if they are not properly arranged and organized

(2) Since these wires include weak current network wires and signal wires are distributed disorderly, it is generally difficult for cleaners to clean the narrow areas where these wires are located, so these places are full of dust, and the laboratory is full of precision instruments.

Through the transformation, a row of boxes was installed behind the table where many electrical appliances and wires were arranged in a disorderly manner, and the instrument wires were straightened out and placed in the box neatly, which was clean and safe, and eliminated the safety brought by cluttered wiring.

Figure 9-6 A clean and safe laboratory environment