Re: Laser printer draws current in a spike, what for?

phil-news-nospam_at_ipal.net
Date: 09/01/04 

Date: 1 Sep 2004 08:37:57 GMT

In alt.engineering.electrical Louis Bybee <louistroutbybee@comcasttrout.net> wrote:

| If you reread 210.6(A) and observe the puncuation you'll see that it refers
| to <dwelling AND guest> rooms of <hotels,motels, etc.>
|
| Check with your AHJ, but most localaties will enforce the article with that
| understanding.

The punctuation to construct that logic is not there. There is also a switch
between "and" and "or" which implies a separate context. Thus you have (my
addition of parenthesis):

  In (dwelling units) and ((guest rooms or guest suites) of hotels, motels,
  and similar occupancies), the voltage shall not exceed 120 volts nominal,
  between conductors that supply the terminals of the following ...

I'd like to have your interpretation. But such an intent would not be written
as it has been. Instead, that would be written like:

<example not real NEC>
  In dwelling units, guest rooms, or guest suites of hotels, motels, and
  and similar occupancies, the voltage shall not exceed 120 volts nominal,
  between conductors that supply the terminals of the following ...
</example not real NEC>

So if the intent was to narrow "dwelling units" to just those of hotels,
motels, and similar occupancies, it would be appropriately written as in
my example.

Still, I think I can get away with having extra 240 volt receptacles
around by merely having (or saying I will have) a portable appliance
that uses 1500 watts or more. A sealed oil heater I used to have in
fact had switchable 600 and 900 watt element and could run both at
the same time. But that ran on 120 volts. I only need to find me a
240 volt version (or hope they designed it with reconfigurable dual
elements for world markets).

| True, but I have encountered apartment, and other communal structures with a
| 240 Delta one leg center tapped, service. Usually the wild leg will only be
| present in panels for common area supporting equipment such as HVAC, pump,
| and other large current drawing equipment.

Still, all the single phase loads are running off one of the phases.

And utilities are phasing out delta apparently due to problems with it
such as blowing fuses on feedback due to a single phase outage. Now
that could still be done with a Scott-T setup without the delta feedback
problem.

| With the atten you are paying to dietail I would enjoy seeing your final
| electrical plans for your impending home. I suspect I would enjoy living in
| it!

Split level A-frame with beam construction and almost all solid wood
paneling walls and solid wood floors at 45 degree angles. Each bedroom
has its own bath and a balcony.

I am working on a program to convert a text-like construction language
into floor plan graphics and will be designing it that way, eventually. 

-- 
-----------------------------------------------------------------------------
| Phil Howard KA9WGN       | http://linuxhomepage.com/      http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/   http://ka9wgn.ham.org/ |
-----------------------------------------------------------------------------

Relevant Pages

  • Re: Laser printer draws current in a spike, what for?
    ... In (dwelling units) and ((guest rooms or guest suites) of hotels, motels, ... and similar occupancies), the voltage shall not exceed 120 volts nominal, ... all the single phase loads are running off one of the phases. ...
    (sci.electronics.design)
  • Re: Laser printer draws current in a spike, what for?
    ... > We do have 240 volts. ... 210.6applies to dwelling and guest rooms of hotels, motels, etc. ... As you alluded there may well be Laser Printers that would qualify to be ... Most 240 volt circuits, in areas of the USA that I'm familiar with, are 120 ...
    (sci.electronics.basics)
  • Re: Laser printer draws current in a spike, what for?
    ... > We do have 240 volts. ... 210.6applies to dwelling and guest rooms of hotels, motels, etc. ... As you alluded there may well be Laser Printers that would qualify to be ... Most 240 volt circuits, in areas of the USA that I'm familiar with, are 120 ...
    (sci.electronics.design)
Quantcast