SQIO-HSIN32: Isolation
Digital Inputs
A creepage and clearance distance of 1.52mm (0.060”) is maintained between the inputs and all other circuits.
Assuming that the local environment is pollution degree 1 and over voltage category II “known and controlled transient voltages,” this spacing according to
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- table D4 of IEC61010 corresponds to 300V of basic insulation.
- table 35.2 of UL508C corresponds to 450V of isolation in equipment of 500VA rating or less and 225V or isolation for equipment rated 500VA-10kVA.
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The purpose of the isolation is to avoid grounding problems and resist radio-frequency interference. It is not intended that the inputs should be connected to signals whose steady-state potential difference from ground exceeds 42.4Vdc.
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