in a 3 phase delta system when 1 phase is grounded is their a shock potential

If another phase faults to ground, kaboom! It takes two failures to have a problem, and the idea is frequent inspection catches the first one. If one phase faults to ground, it's an unintended ground strap, and the system is no longer isolated. I have a 480V 3-phase system, all three phases isolated from ground.

Industry sometimes uses isolated systems. There is a religious battle between isolated systems and grounded systems, with grounded systems winning. CodeĮnter the world of Code electrical, which applies to structures. Any leakage from the high-voltage system is considered a fault, even from the 'negative' side, since 'negative ground' is not a concept in an isolated system. which is fully isolated from the chassis of the car. The Prius or Chevy Volt also has a high-voltage traction electrical system - batteries, electronic inverters, motors etc.

(chassis is also used as a current return that's a separate issue.) chassis) pegged to an arbitrary location in the supply power, almost always negative ground by convention. It's a 12V electrical system with ground (i.e. Chevy Volt - 2 systems at onceĪutomobiles have an apocryphal 'grounded system'. It's about the difference between an isolated system and a grounded system. You're starting off with a very astute observation and a valid concern.

In a 3 phase delta system when 1 phase is grounded is their a shock potential