[RE-wrenches] 1987 NEC

[Hans Frederickson]

Kent,
I'm not a geezer yet, but thanks to my dad I do have a copy of the 1987 NEC.
690-5 (Ground Fault Detection and Interruption) was added in the 1990 NEC.
There is no 690-5 or mention of ground fault detection/interruption in the
1987 NEC.
 
In the 1990 NEC, section 690-5 is very small compared to 690.5 in the 2011
NEC. Here's the complete text from 1990:
 
"690-5. Ground Fault Detection and Interruption.  Roof-mounted photovoltaic
arrays located on dwellings shall be provided with ground-fault protection
to reduce fire hazard. The ground-fault protection circuit shall be capable
of detecting a ground fault, interrupting the fault path, and disabling the
array."
 
The handbook for 1990 goes on to say that the gfp device must:
1) detect the ground fault
2) open the grounded conductor to interrupt the ground fault
3) open the ungrounded conductors and short the photoltaic array source to
disable it
 
For some reason, I've never heard of item #3, specifically the part about
shorting the array. Can anyone shed light on this?
 
Regards,
-Hans

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kent
Osterberg
Sent: Monday, July 18, 2011 10:07 PM
To: gary at icarussolarservices.com; RE-wrenches
Subject: Re: [RE-wrenches] 1987 NEC


Gary,

No one else has come up with a 1987 NEC. If you can get a copy of 1987
section 690.5 (I think it was 690-5 back then), I'd appreciate it.

Kent Osterberg
Blue Mountain Solar



Gary Willett wrote: 

Kent:

I am a member of the International Association of Electrical Inspectors
(IAEI), and they're headquartered here in the Dallas area.

If you aren't successful getting the info from a Wrench with the 1987 code
book, let me know and I am sure I can request a FAXed copy of 1987 section
690.5.



Regards,

Gary Willett, PE
Gary at IcarusSolarServices.com


On 7/15/2011 4:30 PM, Kent Osterberg wrote: 

I'm looking for the text of 1987 NEC 690.5 to compare with 2011 version. If
any of you geezers have kept copies that old, please contact me off list.
Thanks. 

Kent Osterberg 
Blue Mountain Solar 
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