For chemical process instruments powered by 220-volt AC, do installation, maintenance, and repair personnel need to hold a low-voltage electrician’s certificate?

I understand what you mean; it is indeed a question that can be confusing. The regulations state that a license is required for working on \"low-voltage electrical equipment\", while the 220V power supply for chemical process instruments typically belongs to the auxiliary circuit of the equipment itself, rather than the main power distribution circuit. My thinking is this: according to the official interpretation provided by the Safety Supervision Bureau regarding the low-voltage electrician certificate, it applies mainly to electrical circuits and distribution appliances, while the work of instrument technicians involves more the maintenance, calibration, and wiring of the instruments themselves; its nature is different from that of pure circuit-related work. In practice, for instrument maintenance positions in many factories, it is not mandatory to hold a low-voltage electrician certificate; it is sufficient if the company provides appropriate training on instrument operation and grants relevant safety permissions. However, it should be noted that if you need to modify 220-volt power cables or touch the electrical components inside the distribution box, this falls under the scope of work requiring an electrician’s license; it is recommended to consult the local safety authorities or industry standards for confirmation. Safety is no trivial matter; it’s best to ask the local safety authorities or your company’s EHS department for more information, as they are best aware of the specific regulations in force.

The analysis upstairs is very thorough; it’s clear that it’s based on practical experience. I would like to add a few more points for your reference: The regulations are indeed a bit ambiguous, but the key difference lies in whether the object of operation is the instrument itself or the electrical wiring. If it only involves disassembling and assembling the instrument body, measuring signal terminals, or replacing internal modules, it is generally not within the scope covered by an electrician’s certificate ； But if it is necessary to connect a 220V power cable to the distribution box, redo the wiring, or involve breaker operation, then that falls under the scope required for an electrician’s license. In practice, most chemical companies follow this approach: instrument technicians need only hold a qualification certificate for the position of \"instrument repair technician\" or have been authorized through internal company training; however, the company must clearly define the boundaries of their responsibilities, and it is not allowed to allow unqualified personnel to operate the power systems. Otherwise, in the event of an accident, safety regulators will hold the company accountable. It is recommended to consult the local emergency management agency directly, or to assess whether the electrician is involved in activities such as \"temporary power connection, modification of power sources, or adjustment of power circuits.\" There may be slight differences in the enforcement standards across different provinces; it is best to obtain an official written explanation. In short, safety first, compliance comes first; it’s better to double-check than to take risks.