[USMA:15794] Re: IEEE per 2001-10

[Duncan Bath]

From: [EMAIL PROTECTED] <[EMAIL PROTECTED]> To: U.S. Metric Association <[EMAIL PROTECTED]> Date: October 21, 2001 19:00 Subject: [USMA:15790] Re: IEEE per 2001-10 In a message dated 2001-10-21 01:03:31 Eastern Daylight Time, [EMAIL PROTECTED] writes: Does your household shop vacuum actually work at 240 V?  Is this a portable type or one of those mounted to a wall in the basement with hose outlets located in different rooms of the house?  I would guess the later, because I know of no portable household appliance designed to run at 240 V in the US.  Even heating devices, such as portable space heaters, hair dryers, etc. are designed to run at 120 V, 12.5 A (1500 W) maximum.  This assures the normal 15 A branch and socket are not overloaded.   Even so, that "peak horsepower" must be the "power" the motor draws under locked rotor conditions.  The maximum current times the voltage applied divided by 750 and rounded.  I just wonder for how long that motor can provide that peak power before it attempts to burn the house down.   I hope that thing has plenty of fuse protection. It doesn't, it just plugs into the wall, normal 115 volt, 15 amp circuit.  The point of the message was the ludicrous "6.0 HP" claim of the manufacturer.  Since most people have no idea what a HP is anyway they can throw out some phoney big numbers and give people the impression of a vacuum with maximum suck. Carleton   A good point well taken.  BTW, under locked-rotor conditions, the motor delivers zero HP (or kW).  Customary measure contributes, monumentally, to innumeracy whether it is acres, fluid ounces or horse-power. Duncan