How many square meters of cable are used for the on-site solenoid valve?

Please refer to the following standards: GB50217 – Code for Design of Cables in Electrical Engineering; HG/T20512-2014 – Code for Design of Instrument Piping and Wiring; SH/T3019-2016 – Code for Design of Instrument Piping Systems in Petrochemical Industries; SH/T3164-2022 – Code for Design of Lightning Protection Systems for Instrumentation in Petrochemical Industries (effective as of February 1, 2022); GB50059-2014 – Code for Design of Electrical Installations in Explosive Environments. If you don’t want to go into details, generally speaking, for solenoid valves powered by 220V (which can only be used in explosion-proof environments), 2.5mm2 wire is sufficient, while for solenoid valves powered by 24V DC (which can be used in intrinsically safe or explosion-proof environments), 1.5mm2 wire is adequate

Oh, and GB50058 too

Choose 2.5. 1.5 is too thin.

Intrinsic safety is generally 1.5, while explosion protection is generally 2.5

GBT 50892-2013 Code for Design of Instrument and Control Systems in Oil and Gas Fields and Pipeline Projects 10.1.2 The selection of the cross-sectional area of wire and cable conductors shall meet the following requirements: 2 The cross-sectional area of conductors for thermoresistors and alarm interlock signals should not be less than 1.5 mm2, while that of conductors for solenoid valves should not be less than 2.5 mm2. . . . . .

A bunch of idiots – can’t they use the knowledge from middle school to do the calculations?

Selection of cable for ordinary solenoid valves: Minimum operating voltage of the solenoid valve (provided by the manufacturer) -> Calculate the line voltage (maximum voltage drop) -> Calculate the line resistance -> Calculate the resistivity per kilometer; select a cable with an appropriate diameter； For intrinsically safe solenoid valves, in addition to the calculations mentioned above, the inductance and capacitance of the cable must also be calculated. For ordinary solenoid valves, a cable length of 300–400 meters is sufficient, and a 2.5 mm2 cable is appropriate ； A cable of 1.5 mm2 is generally sufficient for intrinsically safe solenoid valves.

It’s better to use 3*2.5, mainly considering the voltage drop over long distances.

2.2.1 Principles for selecting the cross-sectional area of the conductor core: It should meet the functional requirements of detection and control circuits regarding signal transmission, electrical conductivity, insulation and shielding, etc., as well as the requirements for the mechanical strength of the cable during installation. Generally speaking, the minimum cross-sectional area of the conductor core should not be less than 0.5 mm2. 2 The cross-sectional area of the cable should be determined after calculating the line voltage drop and ensuring compliance with intrinsically safe parameters. 3 Except for the circuits of intrinsically safe systems, the minimum cross-sectional area of the conductor cores for instrument signal cables laid in protective steel pipes within explosion-hazardous areas in Zone 1 shall not be less than 2.5 mm2 ； In Zone 2, it should not be less than 1.5 mm2 ； If a multi-core cable is used, the cross-sectional area of its conductors should be at least 1.0 mm2. When designing, solenoid valves are usually required to be used (currently, most have a power consumption of 1.4 W; the standard specifies a maximum of 4 W). The allowable voltage drop for solenoid valves is generally 10% of 24 VDC, which is 2.4 V ； Based on the relationship between power, voltage, and current, I=1.4/24=0.0583(A). Note: For the purpose of including a calculation margin, the voltage in this formula is taken as 24V, rather than the actual operating voltage. According to formula 2-2, it can be calculated that rmax = Ul/I = 2.4/0.0583 = 41.14(Ω). Using formula 2-3, the maximum distance that can be covered with different cross-sectional areas can be determined. Table 2-6 Theoretical maximum installation distance for solenoid valves. The power of the solenoid valve is assumed to be 1.4 W. Wire core cross-sectional area (mm2): 0.5, 0.75, 1.0, 1.5, 2.5. Length of paired cables (m): 547, 820, 1094, 1641, 2735. If the power of the solenoid valve is assumed to be 4 W, the wire core cross-sectional area is still 0.5, 0.75, 1.0, 1.5, 2.5; length of paired cables: 191, 287, 382, 574, 957. For instruments powered by 220V AC, the calculation of the signal cables is not very different from that in two-wire systems; however, the power supply must also meet the technical requirements specified in Table 5.4.1-2 of GB50058 for wiring in explosive environments where the voltage is below 1000 V. In Zone 2, the minimum cross-sectional area of the wires required is 2.5 mm2. Here, its installation distance is not taken into consideration (in line with the calculation method for 24V DC four-wire instruments)

Detailed and complete. I’ve learned it.*