Creepage distance determination:
First need to determine the type of insulation:
Basic insulation: primary circuit and protection ground.
Work insulation ①: a circuit inside; secondary circuit inside.
Work insulation ②: input part (before the input relay) internal, secondary circuit and protection ground.
Reinforced insulation: primary circuit with secondary circuit; input section with primary circuit; charging plate output with internal wiring.
And then look at the line to determine the voltage difference between the lines.
Finally, the corresponding creepage distances are found from the table below

Table 1: creepage distance

Table 2: creepage distance (for basic insulation, work insulation ②, to strengthen insulation)

PCB Layout creepage distance
Determination of clearances:
 
First need to determine the type of insulation:
Basic insulation: primary circuit and protection ground
Work insulation ①: a circuit inside; secondary circuit inside
Work insulation ②: input part (before input relay) internal, secondary circuit and protection ground
Reinforced insulation: primary circuit and secondary circuit; input part to primary circuit; charging plate output with internal circuit
And then look at the line to determine the voltage difference between the lines.
Finally, the corresponding clearances are identified from the table below.

Table 3: Clearance (for a circuit and the secondary circuit, a circuit, the input circuit, the input circuit and other circuits)

Table 4: Clearances (for secondary circuits)