Unfused AC Disconnects with neutral terminal [RE-wrenches]

[Mark Frye]

A fascinating question.

For services, NEC 230.75 Disconnection of Grounded Conductors, you need a
terminal from which the neutral can be disconnected from the service
entrance conductor.

NEC 2005 690.14 (C) Requirements for Disconnecting Means, requires a means
to disconnect all PV system conductors.

So...what is that silly utility switch anyway?  If it is just in series with
a circuit breaker in a load center, then it is not really the disconnecting
means.  The disconnecting means is in the load center where the neutral can
be connected and disconnected from a terminal or bus.

So..if that is what you are doing, there is no reason to interrupt the
neutral in the safety switch.

MPF

-----Original Message-----
From: Ron Stephan [mailto:rstephan at solaresystems.com]
Sent: Tuesday, May 22, 2007 1:22 PM
To: RE-wrenches at topica.com
Subject: Unfused AC Disconnects with neutral terminal [RE-wrenches]




Hi all,
I need some advice on AC disconnects for residential systems. The
utility in New York requires an lockable AC disconnect close to the
meter. Even if a lot of the inverters now come with integrated
disconnects, depending on the inverter location we often need an
additional AC disconnect.

With all kinds of inverters coming out with a neutral for IEEE 1547
compliance, I have a hard time finding unfused, 120/240Vac, 30A or 60A
disconnects with a neutral terminal. We been using a lot of SquareD's
DU221 and DU222 but there is no neutral terminal available for those. I
been thinking of just pulling the neutral straight though the disconnect
(continuous from the inverter to the breaker ) without attaching to a
neutral terminal but I am not sure that meets the code.

Does anybody has a better idea?  Are there disconnects out there that
meet the purpose?

Thanks,
Ron

Ron Stephan
Solar Energy Systems, LLC
1205 Manhattan Avenue
Suite 1210
Brooklyn, NY 11222

www.solarEsystems.com

ph. 718.389.1545 ext. 12
fx. 718.389.2820



[Non-text portions of this message have been removed]


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