Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

The current-carrying capacity of a 0.75 mm² copper wire depends on several factors, including the operating environment, type of insulation, whether the wire is installed in conduit, and the number of wires. Here are some common scenarios and their corresponding current ratings:1. Household PVC-Insulated Copper WireAccording to general experience and standards, the safe current-carrying capacity of household PVC-insulated copper wire is as follows:Safe Current Rating: 6 A per square millimeter.S

In lightning protection systems, the selection of conductive materials and types for connecting air terminals (lightning rods) is very important. Using copper PVC cable to connect to air terminals is not the best choice, and the main reasons are as follows:1. Conductivity Copper Wire: Copper is an excellent conductor and can effectively carry lightning current. PVC Insulation Layer: The PVC insulation layer may melt or burn due to high temperatures during a lightning strike, affecting conductivi

Solid wire and stranded wire are both commonly used types of conductors, each with their own advantages and disadvantages. When discussing resistance, we need to consider factors such as the total cross-sectional area, material, temperature, and the geometric shape of the conductor. Below is some basic information about the resistance characteristics of solid wire and stranded wire:Solid WireSolid wire is made from a single piece of metal conductor without any internal gaps or seams. This type o

Meaning and Causes of Wire BurnoutWire burning out typically refers to a situation where wires lose their ability to function normally due to changes in their physical or chemical properties caused by overheating or other reasons. This may involve the melting of wire insulation, damage to conductors, or failure of connection points, among other issues.The specific situation that led to the wire burning out1.Overload UseWhen the current carried by a wire exceeds its design capacity, it can cause

The maximum number of coil groups in a three-phase motor can be determined by considering the relationship between the number of poles, phases, and slot positions in the motor. Here's how to calculate it:Pole and Slot Count: In a three-phase motor, the slot count is usually a multiple of 3 because each phase has its own coil group evenly distributed around the stator. The relationship between the slot count (S) and the pole count (P) is directly related through the three-phase winding mode: S =

Electric cables are composed of one or more wires enclosed in a protective covering. The choice of wire material depends on several factors including conductivity, cost, flexibility, strength, and resistance to corrosion. The most commonly used types of wire for making electric cables include:Copper (Cu) High Conductivity: Copper has excellent electrical conductivity, second only to silver among common metals. Good Flexibility: Copper is relatively soft and ductile, which makes it easy to work w

Comparison of tinned copper wire and original copper wireIn electrical use, the choice of the right wire material is very important, because it directly affects the performance and life of the circuit. For the original copper wire (bare copper wire) and tinned copper wire, they have different characteristics and application occasions.Electrical conductivityRaw copper wire and tinned copper wire are very good in electrical conductivity. However, because tinned copper wires have a layer of tin on

To calculate the resistance of a copper wire, we can use the resistivity formula: R is resistance (unit: ohms, Ω) ρ is the resistivity of the material (unit: ohms · meters, Ω·m) L is the length of the wire (unit: m, m) A is the cross-sectional area of the wire (unit: square meters, m²)For copper wires, the resistivity is approximately 1.72×10−8Ω⋅m (the standard value at 20°C).First, we need to calculate the cross-sectional area A of the wire. Suppose the wire has a circular cross-section and a d

Using stranded conductors instead of solid conductors in electrical wiring circuits has the following benefits:Mechanical propertiesBetter flexibilityA stranded conductor consists of strands of thin wire twisted together and is softer than a solid conductor. This makes it easier to bend and install during the wiring process, especially if you need to bypass obstacles or wire in tight Spaces.For example, in some complex electrical control cabinets, the use of stranded conductors can easily arrang