Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. ERaySir

    Solution to irritating glare from fluorescent lights

    I saw a low budget solution, The company simply hug the ceiling tile 12" below the fixtures with a 6" horizontal overlap. This however was for smaller offices. Best Regards, Ray Micallef, P. Eng. Power Generation/Utility Industry
  2. ERaySir

    Motor Housing

    czping It may effect the cooling and leave the motor more susceptible to contamination. The magnetic circuit is within the stator. If the stator, which is iron holding the windings, is not dissolved it shouldn't effect the operation unless the cooling is somehow compromised. Best Regards Ray...
  3. ERaySir

    Inrush current carrying capacity of Cable

    PQ The manufacturer should have a destruction or failure curve for the cable similar to a fuse curve on a current-time log-log graph. Should be considered when doing coordination study. Some coordination study software provides generic information. If you have the plant coordination study is...
  4. ERaySir

    High Voltage Cable

    Hello All, Does anyone know the ANSI spec number for High Voltage Insulation Test Levels for High Voltage Cables? I heard the HIPOT Voltage is now 85 kV for 27.6 kV cables. Thank You in Advance Best Regards Ray Micallef, P. Eng. Power Generation/Utility Industry
  5. ERaySir

    Shock from lightning arrester

    Sounds like your ground is not connected properly or is corroded. Your step and touch potential should be no more than 70 volts. Do not disconnect the ground lead. The frame should be bonded as well. I am not familiar with you model of LA. Best Regards Ray Micallef, P. Eng. Power...
  6. ERaySir

    Voltage across VT secondary fuse holder

    Your probably inducing voltage from a High Voltage line in close proximity. Lenz's Law? I think?. Mutual Inductance? Best Regards Ray Micallef, P. Eng. Power Generation/Utility Industry
  7. ERaySir

    malfunction of ballast w/ fluorescent lamps

    Sounds like you may have a voltage drop problem to the ballast. Check the switch and ballast supply voltage. I don't know if you have the wrong ballast for the installation, the manufacturer will tell you if it is suitable. Best Regards Ray Micallef, P. Eng. Power Generation/Utility Industry
  8. ERaySir

    Canadian Engineer moving to the US

    Thank You Everyone for your good advice. It is appreciated. Best Regards Ray Micallef, P. Eng. Power Generation/Utility Industry
  9. ERaySir

    Canadian Engineer moving to the US

    Hello All, Does anyone know what is required to get a PE designation if one already has a PEng designation in Canada? Is the job market good in the USA for Electrical Power Engineers? Thank You in advance. Ray Micallef, P. Eng. Power Generation/Utility Industry
  10. ERaySir

    Source of Large Motor Vibration

    Sorry Gentlemen, I have tunnel vision at times, Squirrel Cage. The cage alignment within the rotor should be verified. It may be slightly misaligned in relation to the rotor and there may be adjustments. Ray Micallef, P. Eng. Power Generation/Utility Industry
  11. ERaySir

    Two Prong Plug

    It must be an older fan. Most apliances that utilize a two prong plug have no exposed metal pieces hence no chance of shocking the user. The older fan case should not have an electrical connection to either of the two prongs. This can be checked with a continuity meter. If it does either the...
  12. ERaySir

    Liquid level sensors and control

    Dadfap has a good idea, A 100VA apc ups would work well with the right size photovoltaic panels and a radio link back. Motorola makes one. Let us know what the final design is. Ray Micallef, P. Eng. Power Generation/Utility Industry
  13. ERaySir

    Source of Large Motor Vibration

    Vibrations could be caused from electrical issues. If the airgap is not consistent (when hot) this would cause more rotor deflection. A shorted or grounded (in 2 or more places) turns in the rotor windings which are a little more common in newer machines cause an uneven field distribution...
  14. ERaySir

    STATOR CURRENTS IN AC GENERATOR

    Phase unbalance could be a result of rotor alignment. The rotor should be aligned when it is warmed up and running at or close to rated output. When the unit is first synchronized it is common for there to be some unbalance as there is still some sag in the rotor. The alignment is an involved...
  15. ERaySir

    Ac input current for battery charging

    Worst posible case: 70 Carts* 9.2A * .6 Serv. Factor / 3 ph= 129A + the rest @ 1 amp (28A) = 160A Sizing looks good to me. Ray Micallef, P. Eng. Power Generation/Utility Industry
  16. ERaySir

    urgent need stair lighting

    My apologies, I just discovered this group. Change the 7" can to a Compact Fluorescent Pot. And, as for the sky lights what is commonly done is aimable heads are mounted on the inside of the cove or recessed fluorescents are mounted inside of the cove on the side closest to the stairway...
  17. ERaySir

    light pollution

    The new full cut off cobrahead luminaires are many times better light uniformity than their old counterparts. If you replace shorter poles with taller poles and the same wattage luminaire, the only difference being the new luminaire will be full cutoff, the effect will be lower lighting on...
  18. ERaySir

    240V lighting verses 115V lighting

    A lot of serious industrial accidents occur with the use of 347 or 277 volt lighting. In many cases 277 or 347 saves the use of the transformer for a 480 or 600 V 4 wire Plant supply. 208 volt Y is also common and safer. With 208V 3phase 4 wire supply each luminaire is 120V (phase to...
  19. ERaySir

    Fault in Generator Terminal Box

    I had a simular problem with two 1.5 MW units. The cause was vibration. In my particular situation the bus was supported very well and the connections were rigid; vibration worked the winding connection free by snapping the weakening the lugs. We repaired the connections and and noticed that...
  20. ERaySir

    Fault in Generator Terminal Box

    I had a simular problem with two 1.5 MW units. The cause was vibration. In my particular situation the bus was supported very well and the connections were rigid; vibration worked the winding connection free by snapping the weakening the lugs. We repaired the connections and and noticed that...

Part and Inventory Search

Back
Top