Walter, You do not want to use borderline amp ratings for fuse/breakers, etc. You have to increase 5 or 10 amps or the breakers will trip often. If there is a direct short it will still open the breakers. Jeff -- Intrepid Video TV/VCR Repair 263 S Front St, Steelton PA 17113 717-939-7708; (F) 717-564-4952 www.intrepid-video.com www.tech-repair.net ----- Original Message ----- From: "walter wood" <wwood_38478@xxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Wednesday, May 05, 2004 10:48 AM Subject: [TechAssist] Re: Need advice from engineering folks. I'll never really know what everyone will show up with, tube, transistor etc. This will be two flat bed trailers for the stage, full of band equipment. I just needed some advice and ammunition to convince the electric company to put more breaker boxes than they have been. Their young engineer doesn't seem to understand. In years past, with the band "kicking" some light breakers have blown. Then we would have to keep some of the lights off. The college says they need four 20 amp breakers themselves. I'm thinking that two 20 amp circuits would do the stage, but why not get 10 if 6 is required at minimum. Thanks Walter --- George <grndmstrg@xxxxxxxxxxxx> wrote: > Walter , > You didn't state if the amplifier is of solid > state or vacuum tube design. > The way I learned it the fuse requirement is > increased by 10% for the slow > blow type and by 50% for the fast blow variety > back when the tube was king . > Was the fuse type and value indicated on the > label? They may have > conservatively rated the unit and did not want > nuisance blowing of the fuse. > Solid state needs fast blow types for better > attempt at protecting the unit. > Either way if it has a bad short it should blow > the fuse. Anyway ask for a > lot more than you think will be needed, you can > never have enough power. > > George > Afana Electronics > Moreno Valley, CA > ----- Original Message ----- > From: "walter wood" <wwood_38478@xxxxxxxxx> > To: "Tech Assist" <techassist@xxxxxxxxxxxxx> > Sent: Tuesday, May 04, 2004 7:54 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 > > > > > -------------------------------------------------------------------------- > --- > > Lost Password: > > http://www.tech-assist.org and select "Login > Problems?". > > Email Archives: > > //www.freelists.org/archives/techassist/ > > > > > > ----------------------------------------------------------------------------- > Lost Password: > http://www.tech-assist.org and select "Login > Problems?". > Email Archives: > //www.freelists.org/archives/techassist/ ===== 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 ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". 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