[169886] in North American Network Operators' Group
Re: L6-20P -> L6-30R
daemon@ATHENA.MIT.EDU (Lamar Owen)
Wed Mar 19 14:28:08 2014
Date: Wed, 19 Mar 2014 14:27:38 -0400
From: Lamar Owen <lowen@pari.edu>
To: NANOG <nanog@nanog.org>
In-Reply-To: <CAP-guGUiQZefcb7KyV22Uz-VwqyU_G6isozUFued8mkruWtWmA@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 03/19/2014 02:05 PM, William Herrin wrote:
> 50 watts DC. It won't electrocute you (that's AC) but it's the same
> power that makes a 40 watt bulb burning hot.
802.3af is limited to 15.4W, and 802.3at to 25.5W. The limits for Class
2 and 3 circuits are found in Chapter 9, Table 11 (A and B), of the NEC
(Table 11(B) for DC circuits, and for a power source of 30 to 60 volts a
Class 2 circuit can have, for a 44VDC supply power, up to 3.4A available
(a max nameplate rating of 100VA). For AC, Table 11(A) tells me that a
120VAC circuit, to meet Class 2, must be current-limited to 5mA.
BICSI has a good set of slides on the NEC at
http://www.bicsi.org/uploadedfiles/Conference_Websites/Winter_Conference/2012/presentations/Interpreting%20the%20National%20Electrical%20Code.pdf
