Safety Tests (HI-POT & Earth continuity)...

 
  As part of the servicing process all products undergo input to Earth, input to output and output to Earth
  isolation checks to EN60950 standards.

  Earth continuity is checked using a 20A rated AC current source
  (measuring from Earth connector to chassis or furthest point from
  connector).
  
  For medical applications Earth leakage is also checked (subject to
  medical grade being known) with typical leakage  <500uA.

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