[TechAssist] Re: Need advice from engineering folks.
- From: "J Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 5 May 2004 13:52:30 -0400
Incandescent lighting can draw a surge of up to 10 times operating current
when first turned on. The wire sizes and circuit breaker time delays have to
be sized to take this into account. The rules for sizing the wiring and
selecting the protection devices are spelled out in the National Electrical
Code Handbook. The power company is capable of providing this information
but they may not want to. A master electrician should be capable of advising
you.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "tvservice" <tvservice@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, May 05, 2004 9:40 AM
Subject: [TechAssist] Re: Need advice from engineering folks.
>
> OHMS LAW
> W= watts/power
> I= current/amps
> E=volts
> I = E / R
>
> example 120v X 2.5a = 300w or 300=2.5 X 120 or 300/120=2.5
>
> multiply volt with current for watts
> or divide volts into watts for current(amps)
> or divide amps into watts for volts
>
> example: You have six lamps on a given circuit, each lamp uses 300 watts.
> Total of lamps on a circuit are 1800 watts and are powered with 120 volts.
> The lamps will require 15 amps (1800/120=15)
>
> hth
> Robert
> tvservice@xxxxxxxxxxxxx
> H & H Electronics Inc
>
> ----- Original Message -----
> From: "walter wood" <wwood_38478@xxxxxxxxx>
> To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, May 04, 2004 9:54 PM
> Subject: [TechAssist] Need advice from engineering folks.
>
>
> > Watts divided volts equal amps.
> > 100 watts divided by 100 volts = 1 amp.
> > That's the way a broadcast engineer told me to
> > remember Ohms Law 40 years ago.
> > Now the reason for the question;
> > I have provided the main outdoor sound system,
> > gratis, for the last 3 years, for the Relay for
> > Life charity.
> > The local college provides the lights, and the
> > electric company puts a tempoary service at the
> > location.
> > We've never had enough electricity.
> > Thet are offering to put a permanent service there,
> > and want to know how much IS enough.
> > I measured the current through a 100 watt light
> > bulb, on normal line voltage and read 0.82 amps.
> > That's about right as the voltage was up from the
> > example, therefore the amperage goes down.
> > I measured a 60 watt bulb and got 0.5, exactly what
> > it should be.
> > I then measured a Peavey Session 400 amp, and it
> > read 0.44 amps at idle, but it didn't take much
> > volume to raise the draw to 1 amp.
> > The back plate on this amp states 600 watts and 120
> > volts.
> > It is fused at 6 amps.
> > Following the formula, it should pull 5 amps "maxed
> > out".
> > I know that's a lot of e-mail, but the question can
> > be answered yes or know.
> > "Will I be safe in requiring the amperage of all
> > the amps and effects, etc. to equal the total of
> > their fused ratings."
> > I would think that would be more than adaquite, but
> > I'm asking for the expert advice.
> > I intend to ask for much more because we see the
> > need getting larger in the future, and anyway, it's
> > impossible to know what kind of equipment everyone
> > will show up with.
> > The college already knows the requirments for the
> > lights.
> > TIA
> > Water
> >
> >
> >
> > =====
> > Walter Wood
> > Future Tech Home Center
> > 2786 Hwy. 43 N.
> > Lawrenceburg Tn. 38464
> > 931-829-3337
> > Fax 931-829-4044
> > mailto:wwood_38478@xxxxxxxxx
> >
> >
> >
> >
> > __________________________________
> > Do you Yahoo!?
> > Win a $20,000 Career Makeover at Yahoo! HotJobs
> > http://hotjobs.sweepstakes.yahoo.com/careermakeover
> >
>
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