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  1. jthjr

    208zz/120

    What does the zz mean?
  2. jthjr

    Chiller Tonnage

    Can someone tell me the tonnage for the following three chillers from their model numbers? York YTG1A1B2-CGH8 York YCWJ55HE0-46PA York YCWZ33AB0-46PB Is this information avaiabe in either Preston's Guide or Technical Reference Guide by Carson Dunlop? Or is there a different refence guide for...
  3. jthjr

    Switchgear versus switchboards

    This seems to be constant topic in our office. I was wondering if someone could give me their opinion of the basic differnece between the two. Thank you.
  4. jthjr

    SERVICE FACTOR

    I have moticed exhaust fan motors with HP ratings from 2 on down with service factors of 1.35. I then see return and supply fan motors with a HP rating from 7.5 to 20 with service factors at 1.15. Is there a general rule for the service factor to be higher in motors with a smaller HP? Would...
  5. jthjr

    Panelboard current rating

    If I have a 400 amp panelboard, what is the highest combination of breakers I can possibly have? Is there a formula? Would I be able to have say 5 100 amp breakers in a 400 amp panel?
  6. jthjr

    Free corporate electrical courses??

    I have found two free courses on basic electricity offered by large corporations. Siemens http://www.sea.siemens.com/step/default.html Cutler Hammer http://www.eatonelectrical.com/unsecure/html/101basics/101basics.html Does anyone else have some suggestions?

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