Gary,
First of all, the message I replied to stated that the fuse is not used to
protect the device, which of course it is. I added that it is also used to
protect the equipment. It is not the sole protection for all pieces of
equipment. Doesn't your computer's power supply have thermal protection? This
will protect the computer, and the cord. The fuse will blow in the event of a
fault at the cord.
You are reading things into my statement that are not there. I never mentioned
the NEC, nevertheless, you are wrong about the NEC. Protection of equipment is
very much a part of the NEC. The NEC addresses the building wiring, but it is
designed to protect the equipment you plug into your electrical system, and the
equipment you plug in or hardwire dictates how the circuit must be designed for
proper protection of the equipment.
Contrary to popular beliefs, the NEC does affect how equipment is built,
sometimes directly, and sometimes by reference. Many people refer to standards
that are "not code", but do not realize that many standards are actually code
because they are included in the NEC by reference.
Jim Smith, EE
KQ6UV
--- On Mon, 8/10/09, Gary Schafer <garyschafer@comcast.net> wrote:
From: Gary Schafer <garyschafer@comcast.net>
Subject: RE: [Amps] 240V Outlet
To: jimsmitheguard-a@yahoo.com, "'AMPS List'" <amps@contesting.com>
Date: Monday, August 10, 2009, 8:55 AM
I disagree. The nec is only concerned about the wire between the breaker and
outlet being protected. You can readily plug in a computer for example that
has only #18 wire in its power cord. Surely the 20 amp breaker in the power
panel is not expected to protect that #18 computer cord.
If they were concerned about anything further they would require a smaller
fuse at the outlet where the computer was plugged into or require #12 power
cord to the computer.
73
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of jimsmitheguard-a@yahoo.com
> Sent: Monday, August 10, 2009 12:37 AM
> To: AMPS List
> Subject: Re: [Amps] 240V Outlet
>
> No, the fuse is to protect people. That means protecting the wiring,
> device, and appliance to avoid fires. The rated current of an item is not
> necessarily the size of the required overcurrent protection.
>
> The example does not demonstrate undersized wiring. It demonstrates too
> few circuits. As stated earlier, you can use one large circuit to feed
> them all, provided you install the smaller protection where you tap off to
> feed the loads, but this is not the common way of circuiting. This method
> is normally used where it's not feasible, or desirable to run individual
> circuits.
>
>
> Jim Smith, EE
> KQ6UV
>
> --- On Sun, 8/9/09, vk3pa@vk3pa.com <vk3pa@vk3pa.com> wrote:
>
>
> From: vk3pa@vk3pa.com <vk3pa@vk3pa.com>
> Subject: Re: [Amps] 240V Outlet
> To: amps@contesting.com
> Date: Sunday, August 9, 2009, 5:44 PM
>
>
> Quoting Paul Christensen <w9ac@arrl.net>:
>
> In vk land the reason for the fuse is to protect the WIRING not the
> device as per u could have 3 devices on one circuit say each @ 5 amps
> es ur c/breaker is rated at 15Amps just ok for ur wiring "but" say u
> have 3 devices @ 10Amp 0Amps then your wiring is under rated..if ur
> using 15Amp rated wiring for that circuit!!
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|