Grounding separately derived systems

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gonggd

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Do I need to install a ground rod on the secondary side of a small separately derived system (transformer)? I have a 50VA 240/120 volt stepdown transformer feeding a GFCI duplex receptacle. The receptacle provides power to a cord connected auto drain control on an air compressor receiving tank. The receptacle and transformer are inside a garden shed that encloses the air compressor. There is no cold water pipe or structural steel framing available nearby for grounding the transformer. NEC Article 250-20(b)requires the secondary side of the transformer to be grounded. Can I simply ground the secondary side to the primary side equipment grounding conductor or enclosure ground? And/or does NEC Article 250-30 require me to install a ground rod?
 
Re: Grounding separately derived systems

I think your driving a rod. :D

I also think you will be replacing this 50 VA transformer every time someone decides to use the outlet for anything other than the auto drain. :p
 
Re: Grounding separately derived systems

take a look at NEC 250.21(3), you might not have to provide a ground rod, it's seems selly to drive a ground rod for a 50 VA xfmr.
 
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