[RE-wrenches] GFCI Options and OCP on SMA's Secure Power Supply

Jeff Clearwater jeffc at villagepowerdesign.com
Wed Nov 6 11:34:41 EST 2019


Wrenches,

I've got 5 SB 7.7s going in and I'm contemplating various ways to 
configure the 5 SPS circuits.

Questions:

1.  I'm not clear if additional overcurrent protection is needed 
anywhere in the circuit?  - the SMA manual doesn't mention it and I'm 
wondering if it's built in?  I assume the switch is not carrying the 
current so doesn't need OCP but how about the outlet?

2.  SMA recommends 30mA of for the GFCI device - Most GFCI outlets are 
5mA (Class A) or 20mA (Class B).  What have folks been using to avoid 
nuisance tripping?  Does this lead us back to a 30mA GFCI breaker?

3.  Anyone experience appliance damage from brownouts - can one run 
multiple fridges on one 16 Amp circuit?  Experience?

Thanks!

Jeff

~~~~~~~~~~~
Jeff Clearwater
Village Power Design
linkedin <https://www.linkedin.com/in/jeff-clearwater-0622a312/>
www.villagepowerdesign.com <http://www.villagepowerdesign.com>
cell - 413-559-9763
~~~~~~~~~~~~~~~~~~~~~~~
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