DC-GFP/2 protection [RE-wrenches]

[Steve Willey, Backwoods Solar]

No, ungrounded systems can charge up with static, not necessarily internally
sourced, maybe just warm wind blowingoverit.  Then it does arc to something,
small current, high voltage, just right to fry electronics.
Steve Willey       steve at backwoodssolar.com
Backwoods Solar Electric Systems
----- Original Message -----
From: "Todd Cory, Mt. Shasta Energy Services" <toddcory at finestplanet.com>
To: <RE-wrenches at topica.com>
Sent: Friday, August 23, 2002 3:38 PM
Subject: Re: DC-GFP/2 protection [RE-wrenches]
> Bill, I am not sure I understand the statement above. Why do ungrounded
systems
> need to be referenced to ground? If it is ungrounded the 5 kV you mention
above
> will be with respect to *ONLY* the other conductor. It will NOT "flash
over" to
> any other thing just because it is metal or grounded. That is the beauty
not
> having any conductors grounded. The potential only is between the 2
conductors.
>
> With an ungrounded system, the only way you could get a shock is if you
touch
> both conductors at the same time, or if (like is foolishly done in this
country)
> one conductor is grounded. Then when you are standing on the earth you are
in
> contact with one conductor. This seems much less safe than a system that
is
> totally floated and thusly insulated from people (who usually stand on the
> earth).
>

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