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  • Users: TWW
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  1. TWW

    10 kW 60/50Hz MG or invertor

    Any sources for motor generators or invertors that will convert 208 or 480v 60Hz to 220V 50Hz (single phase or 3-phase) Motor generators are prefered (from our 60/400 hz experiences) Power output in the 10KW range. Thanks
  2. TWW

    AFD emergency disconnect

    The US navy no longer trust (most) microproccessor AFD drives on crane hoist motors to be shut down (ie upper limit switch) using the AFD's built in logic/ discrete input. Therefore I am faced with the prospect of opening the three legs of the input or output of the AFD. I am worried about...
  3. TWW

    replacing panel board interiors

    In cases of retrofits (grouted in panelboards, panel boards connected to many RGS conduits with seals etc.) , We have often specified replacing the interiors of old obsolete panel boards with new interiors and covers. The new interiors are much smaller than the old so clearance is not an issue...
  4. TWW

    PANEL SIDE FED MAIN BREAKERS

    What are the NEC requirements in regard to using a normal circuit breaker as a panel main disconnect. That is with a single power source and the normal main lugs are left open. It is a common practice in the field, but, I need to double check if there are restrictions on this practice. In this...
  5. TWW

    DISCONNECT ON UTILITY SIDE OF AN ATS

    I have been trying to determine the NEC code requirement of a disconnect switch on the "utility" side of an automatic transfer switch. This is for a 701 legally required standby system with diesel generator as back-up source. I note that the handbook drawing of exhibit 700.1 does not...
  6. TWW

    1/4 HP MOTOR

    For a solar powered application we have had success using a 1/4hp 24v dc 1800rpm motor to drive a swamp cooler that normily requires a 1/2 hp ac motor, (although the pully ratio was slightly increased). Now we have upgraded to new sinewave invertor would like to consider an A/C motor...
  7. TWW

    ANSI C84.1 RANGE A/B

    The ANSI standard C84.1 designates voltage range A and B and service/utilization. The service/utilization is quite clear, however the service range A versus B is not clear as to how and when each apply. Probably written by committee. An Airforce TM 5-811-1/AFJMAN indicates A is industrial (large...
  8. TWW

    airport lighting cable sizing

    For constant current regulated 6.6A airport lighting circuits, what is the determining factor one must consider in sizing the cable, ie. allowable voltage drop. I have one run here that is 51,000 ft! Thankyou in advance.
  9. TWW

    what is a KUXON

    It appears to be a thermal overload on crane schematics, but would like to know for sure. Thanks

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