PCEC
Technical Article
As an option to reduce the spacing requirements for conductive components, when the pollution level is controlled to level 2 or lower, the spacing and component isolation of printed circuit boards with ‘ic’ protection level assembly can use the reduced spacing shown in Table 1 under the following conditions. That is, if the rated voltage of the equipment or the nominal voltage of any part does not exceed 60 V peak, there are no other requirements for isolation spacing apart from general industrial standards. Equipment with a rated voltage in the range of 60~375 V peak should meet the requirements for creepage distance and air gap as specified in Table 1. Regardless of whether inside or outside the equipment, measures should be taken to limit the circuit to the overvoltage category II as specified in GB/T 16935.1—2023 “Insulation Coordination for Equipment in Low-Voltage Power Supply Systems Part 1: Principles, Requirements, and Tests”.
Table 1 Special Conditions for Protection Level, Materials, and Installation Compliance
Electrical Clearance, Creepage Distance, and Spacing for ‘ic’ Protection Level
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Planning: PCEC Testing and Inspection Center
Text/Image: Chen Mingwei
Review: Liu Bing, An Penghui
Editor: Meng Fanhua
Chief Editor: Jia Lei
Supervisor: Yin Hong
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