[RE-wrenches] Arc fault questions.

[Bill Brooks]

Tump,

All I know is that AFCIs work off of the radio frequency signatures of arcs.
If your inverter has a lot of high frequency noise, typical in off-grid
inverters, it may be seeing this noise and thinking it is an arc. Marv
Dargatz, may have something to add on this. Also, relays in your charge
controllers might also be interpreted as an arc. These are challenges that
have to be addressed for equipment to meet the requirements of the 2011 NEC
that will require series arc detection on all systems with a maximum system
voltage over 80 volts, which would include all 48-Volt dc off-grid systems.

Bill.

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of
tump at hughes.net
Sent: Monday, May 31, 2010 4:32 AM
To: RE-wrenches
Subject: [RE-wrenches] Arc fault questions.

Can & will someone explain, why off grid inverters will cause nuisance
tripping of the AF receptacle. 
Does anyone have "real" field information as to how this might be reduced or
eliminated? How about  which AF receptacles are less likely to trip? 
TIA tump
Sent via BlackBerry by AT&T
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