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ELECTRICAL CONDUCTORS 81
(66) In the three central flat copper bars called bus bars are (67) screw heads indicating electrical connection between the bus bars. At the bottom we see three of these screw heads, denoting that the three lugs leading to circuit wires are connected to the main bars. These lugs connect to a 3-wire circuit. Above this the lower bar connects to the left main bus bar, the next to neutral and the next to the right bar. On either side the subbars feed four 2-wire circuits. Fig. 22 is a diagrammatic view of a board fed by a three-wire circuit.
Fuses
Before entering into a discussion of fuses we will quote again from the National Electrical Code:
LINK FUSES Link fuses shall not be installed except by permission of the authority enforcing this code. When used in capacities from 601 to 1500 amperes they shall be of dimensions and other characteristics specified in paragraphs a to d inclusive of Section 802 of the 1930 edition of this code.
ENCLOSED FUSES
Enclosed fuses shall be classified to correspond with the several classes of standard cutout bases and shall be so designed that it will be impossible to put any fuse of a given class into a cutout base which is designed for a current of voltage lower than that of the class to which the fuse belongs.
Each fuse shall be marked with its amperage capacity. On ferrule contact fuses this marking shall be on the tubes or ferrules and on knife-blade fuses, on the tubes or caps. In addition to the above marking each cartridge fuse shall be provided with a paper label, red for 600-volt fuses, navy blue for 250-volt fuses, of 15 amperes or less capacity, and green for 250-volt fuses of over 15 amperes capacity. Such labels for cartridge fuses shall bear the following: the name or trademark of the manufacturer and the voltage for which the fuse is designed.
Plug fuses of 15 amperes capacity or less shall be distinguished from those of larger capacity as follows : by an hexagonal opening in the cap through which the mica or similar window shows, or by some other prominent hexagonal feature such as the form of the top or cap itself, or an hexagonal recess or projection in the top or cap.
The styles of enclosed plug and cartridge fuse terminals shall be as follows : Not over 250 volts.
( A. Cartridge fuse (ferrule contact). 0 30 Amps. \ B. Approved plugs or cartridge fuses in approved casV ings, for use with screw-shell plug cutoul bases.
31 60 " Cartridge fuse (ferrule contact).
61-100 |J ) 201-400 " ( Cartridge fuse (knife-blade contact).
401-600 " )