Tools - Communication (CA12006E)

Reference Data NEMA Construction Standards Electric Power Connectors (continued)

Example Number 2 – A single-size “T” connector is used to connect a 3-inch Schedule 40 aluminum main to a 397.5 kcmil ACSR tap (outside diameter = 0.743 inch). After locating the proper line for the 3-inch pipe in the first column of the table, it will be seen that the connectors require four 5 / 8 inch diameter bolts per conductor. After locating the proper line for the 0.743-inch outside diameter ACSR tap in the third column of the table, it will be seen that the connectors require four 1 / 2 inch diameter bolts per conductor. Example Number 1 – A straight coupler connector or a 90 ° elbow connector is used to connect a conductor of 1 1 / 2 inch pipe to another conductor of 1 1 / 2 inch pipe. After locating the proper line for the 1 1 / 2 inch pipe in the first column of the table, the total number of bolts required can be determined from the information given for the connectors, as follows: For standard-duty connectors Three 1 / 2 -inch diameter bolts per conductor x 2 (number of conductors) = a total of six 1 / 2 -inch diameter bolts per fitting For heavy-duty connectors Four 1 / 2 -inch diameter bolts per conductor x 2 (number of conductors) = a total of eight 1 / 2 -inch diameter bolts per fitting

In this case, and in accordance with the notes following the table above, the manufacturer has the choice of using either four 1 / 2 inch diameterr bolts per conductor of four 5 / 8 inch diameter bolts per conductor.

Example Number 3 – A copper stud connector having a 1 1 / 8 inch-12 thread is connected to copper cable ranging from 400 to 800 kcmil in size. Using the fourth column for the stud and the second column for the copper cable, it will be seen that the connectors require four 3 / 8 inch diameter bolts per conductor for the stud and four 1 / 2 inch diameter bolts per conductor for the cable.

In this case, and in accordance with the notes following the table above, the manufacturer has the choice of using either four 3 / 8 inch diameter bolts per conductor or four 1 / 2 inch diameterr bolts per conductor.

reference data

Page 71 | August 2013