Shenhai Explosion-Proof
Wiring in explosion-proof distribution boxes during installation and maintenance is a common task, particularly when extending connection lines. Often, due to non-standard operations by some technicians, issues like damaged power lines, mainboard components, fuses, and communication failures occur frequently. Today, we share a series of standard wiring procedures and precautions, with a focus on residential explosion-proof distribution boxes and their circuit configurations:
Experienced electricians often ponder whether to connect the neutral wire of a residential explosion-proof distribution box circuit to the neutral bar. Not every circuit’s neutral wire needs to be connected to the neutral bar; it usually depends on the type of air switch we choose.
Residential electricity typically uses single-phase (220V) power, and the switches in the distribution box can be categorized into three types based on poles: 1P, 1P+N, 2P. Let’s delve into the wiring methods for these switches:
Wiring of an Explosion-Proof Distribution Box with Connected Wires
Wiring of a 1P Switch in an Explosion-Proof Distribution Box:
Explosion-Proof Distribution Box with a 1P Switch
As seen in the image above, a 1P switch has only one input and one output, each with a single live wire and no neutral connection;
Thus, the neutral wires can only be connected to the neutral bar, with both input and output wires connected there.
Wiring of a 1P+N Switch Panel:
Wiring Diagram of a 2P Explosion-Proof Distribution Box
From the image above, it’s evident that a 1P+N switch has two terminals for both input and output, each with a live and a neutral wire;
For a 1P+N switch, both the live and neutral wires are connected directly to the switch’s input and output terminals, bypassing the need for a neutral bar.
Wiring of a 2P Switch:
Wiring of a 2P Switch in an Explosion-Proof Distribution Box
The image above also shows that a 2P switch has two terminals for both input and output, each with a live and a neutral wire;
For a 2P switch, both live and neutral wires are connected to the switch’s input and output terminals, similarly bypassing the neutral bar.
In an Explosion-Proof Distribution Box, Only the Neutral Wires of 1P Switches Need to be Connected to the Neutral Bar
Through the analysis of the wiring methods for the three common types of switches used in home installations, it’s clear that only the neutral wire of the 1P switch needs to be connected to the neutral bar. Other switch types do not require connection to the neutral bar.
These wiring methods and precautions should be diligently learned and strictly adhered to, ensuring standard and safe wiring practices.