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ISO7821: 14.5mm clearance and creepage for 1500VDC working voltage

Part Number: ISO7821

Hi,

my customer is using C2000 to control an inverter with 1500VDC BUS. And there is a communication board based on STM32F107 in the system.

The customer is using SCI(UART) to communicate between C2000 and F107.

But they said that since it's 1500VDC working voltage, so they need at least 15mm clearance and creepage digital isolator. So they choose 15mm clearance and creepage optocoupler.

I wonder if the statement is true that 14.5mm can't be used in 1500VDC system.