Re: [K3] Why fuse the negative lead from a battery?

Posted by James Maynard-2 on Apr 04, 2011; 8:40am
URL: http://elecraft.85.s1.nabble.com/K3-Why-fuse-the-negative-lead-from-a-battery-tp6233377p6237688.html

On 2011-04-04 12:38 AM, Jim Brown wrote:

> It's critical to realize that Codes and Standards are written for specific situations. NEC applies ONLY to premises wiring, and to some
> extent, to wiring connected to premises wiring (like a standby
> generator, or an accessory building, like a garage powered from the same
> service).  It does NOT apply to vehicles, or boats, or to the power
> company's wiring outside the premises.
>
> When Standards and Codes are written, very smart and experienced
> engineers cogitate and discuss all the possible implications of the
> requirements of the proposed standard, trying very hard to consider how
> the system would react to any of the myriad of things that might go
> wrong, and with serious attention both to how things are done in the
> real world, and to the laws of physics.For about ten years,  I've been a
> part of that process as a member of the AES Standards Committee, and am
> a principal author of all of our published standards on EMC. A typical
> Standard takes 3-5 years to be conceived, written, and adopted. I have a
> great deal of respect for my colleagues, and others  who do this, and
> for the resulting standards and codes.
>
> 73, Jim Brown K9YC

Indeed.  The "Scope" section of a standard is Very Important Indeed.  So
if I am to make disparaging comments about the use of NEC, it behooves
me to purchase my own copy of it.   Thank you for making that point.

I, too, have been involved in the standards development process, first
for computer codes and character sets (I was a member of ANSI X3L2, the
same committee that had -- before my participation -- given us ASCII,
the American National Standard Code for Information Interchange.  Later
I was a member of a committee under RTCA, developing standards for the
use of GPS in the navigation systems of aircraft.)  These people work
hard, and it's a lot of fun meeting people from other companies and
government agencies involved in the developing those standards.

Do you know, Jim, whether the definition of "premises" in the NEC would
include an entire marina? Not the boats kept in the marina, but the
wiring of such structures as floating docks?

73, Jim Maynard K7KK




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