... six conductors must be provided, because on a three-phase, 4-wire wye- connected service only three circuits may be installed ... pull wire in each; this may be designated either in the symbol list or in the written specifications. ... Although the designer did not specify an outlet in the stairs or vestibule, one would be advisable for use by the janitor for connecting floor polishers, vacuum cleaners, and the like. ... two- wire circuit (208 V) is for a combination sink- refrigerator-cooking unit.
|Title||:||Electrical design for building construction|
|Author||:||John E. Traister|
|Publisher||:||McGraw-Hill - 1985|