Posted by harry on April 18, 2009, 6:27 pm
wrote:
> Jim Wilkins wrote:
> > > > daestrom wrote:
> > > >> The real question is, "When a flourescent fixture says it is rated for
40
> > > >> watts, is that the power at the input to the entire fixture, or the
input
> > > >> to the bulb?"
> > > > Appliances are always rated at the input power to the device ( not
> > > > sub-part ).
> > > Maybe on your side of the pond.
> > > But here the nominal rating for fluorescent lamps is *not* the power going
> > > into the fixture. The nominal rating (e.g. 40 watt) is the nominal power
> > > rating of the fluorescent lamp sans ballast. (see definition 1.11 under
App
> > > Q of the reference)
> > >http://edocket.access.gpo.gov/cfr_2009/janqtr/pdf/10cfr430BAppQ.pdf
> > "Advance" shop light ballast label:
> > 120 Volts, 60 Hertz, Line Current .80 amp.
> > For 2-40W 430 MA RS lamps or 2-F-40-4FT "34W" or "35W" RS lamps 460 MA
> > MAX
> I hope you know the difference between VA and Watts.
> Graham
Cos phi :-)
Posted by Eeyore on April 18, 2009, 7:26 pm
harry wrote:
> > Jim Wilkins wrote:
> > > > > daestrom wrote:
> >
> > > > >> The real question is, "When a flourescent fixture says it is rated
for 40
> > > > >> watts, is that the power at the input to the entire fixture, or the
input
> > > > >> to the bulb?"
> >
> > > > > Appliances are always rated at the input power to the device ( not
> > > > > sub-part ).
> >
> > > > Maybe on your side of the pond.
> >
> > > > But here the nominal rating for fluorescent lamps is *not* the power
going
> > > > into the fixture. The nominal rating (e.g. 40 watt) is the nominal power
> > > > rating of the fluorescent lamp sans ballast. (see definition 1.11 under
App
> > > > Q of the reference)
> >
> > > >http://edocket.access.gpo.gov/cfr_2009/janqtr/pdf/10cfr430BAppQ.pdf
> >
> > > "Advance" shop light ballast label:
> > > 120 Volts, 60 Hertz, Line Current .80 amp.
> > > For 2-40W 430 MA RS lamps or 2-F-40-4FT "34W" or "35W" RS lamps 460 MA
> > > MAX
> >
> > I hope you know the difference between VA and Watts.
> >
> > Graham
> Cos phi :-)
Rarely these days and certainly not with electronic ballasts.
Graham
Posted by daestrom on April 20, 2009, 9:23 pm
> Jim Wilkins wrote:
>> > > daestrom wrote:
>> >
>> > >> The real question is, "When a flourescent fixture says it is rated
>> > >> for 40
>> > >> watts, is that the power at the input to the entire fixture, or the
>> > >> input
>> > >> to the bulb?"
>> >
>> > > Appliances are always rated at the input power to the device ( not
>> > > sub-part ).
>> >
>> > Maybe on your side of the pond.
>> >
>> > But here the nominal rating for fluorescent lamps is *not* the power
>> > going
>> > into the fixture. The nominal rating (e.g. 40 watt) is the nominal
>> > power
>> > rating of the fluorescent lamp sans ballast. (see definition 1.11
>> > under App
>> > Q of the reference)
>> >
>> > http://edocket.access.gpo.gov/cfr_2009/janqtr/pdf/10cfr430BAppQ.pdf
>>
>> "Advance" shop light ballast label:
>> 120 Volts, 60 Hertz, Line Current .80 amp.
>> For 2-40W 430 MA RS lamps or 2-F-40-4FT "34W" or "35W" RS lamps 460 MA
>> MAX
> I hope you know the difference between VA and Watts.
Right to point out the difference. The VA rating (more precisely the
current rating) is how you determine conductor size and over-current
protection. Not the Watts.
daestrom
Posted by Eeyore on April 18, 2009, 3:58 pm
daestrom wrote:
> > daestrom wrote:
> >
> >> The real question is, "When a flourescent fixture says it is rated for 40
> >> watts, is that the power at the input to the entire fixture, or the input
> >> to
> >> the bulb?"
> >
> > Appliances are always rated at the input power to the device ( not
> > sub-part ).
> Maybe on your side of the pond.
The one that uses International Standards ( IEC ). The US is converting to
comply or it will not be able to compete in the world market. UL has no validity
outside your own country.
It's no accident that UL1950 is based on IEC 60950 ( IT equipment ). Previously
IEC950.
Graham
Posted by Tim Jackson on April 18, 2009, 6:18 pm
daestrom wrote:
>
>>
>>
>> daestrom wrote:
>>
>>> The real question is, "When a flourescent fixture says it is rated
>>> for 40
>>> watts, is that the power at the input to the entire fixture, or the
>>> input to
>>> the bulb?"
>>
>> Appliances are always rated at the input power to the device ( not
>> sub-part ).
>>
>
> Maybe on your side of the pond.
>
> But here the nominal rating for fluorescent lamps is *not* the power
> going into the fixture. The nominal rating (e.g. 40 watt) is the
> nominal power rating of the fluorescent lamp sans ballast. (see
> definition 1.11 under App Q of the reference)
>
> http://edocket.access.gpo.gov/cfr_2009/janqtr/pdf/10cfr430BAppQ.pdf
>
> daestrom
>
What you say may be true but your reference does not support the
statement. It says
"1.11 Nominal lamp watts means the wattage at which a fluorescent lamp
is designed to operate."
It says nothing about how or where that wattage is measured and makes no
mention of ballast. The only description of a power test is for input
power, as follows
"3.3.1. Input Power. Measure the input power (watts) to the ballast in
accordance with ANSI Standard C82.2–1984, section 3.2.1(3) and section 4."
It does not explain here the purpose of this test and its relationship
to nominal power. I would be inclined to assume in absence of
statements to the contrary that "nominal power" should reflect power
consumption as measured according to the standard. There is no mention
anywhere of measuring power at the tube.
Tim Jackson
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> > > > daestrom wrote:
> > > >> The real question is, "When a flourescent fixture says it is rated for
40
> > > >> watts, is that the power at the input to the entire fixture, or the