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Home › Products › Connectors › Distribution › Standard Voltage › Reference Data › NEMA Construction Standards

NEMA Construction Standards Electric Power Connectors

CC 1-4.06 Number and Diameter of Bolts for Connectors

Type of Conductor				For Copper Conductors					For Aluminum or ACSR Conductors
Standard Pipe Size, Inches	Copper Cable, kcmil	Aluminum or ACSR Cable Outside Diameter, Inches	Stud Diameter, Inches	Single Size Standard Duty Bolts Per Conductor		Single Size Heavy Duty Bolts Per Conductor		Range Taking Bolts Per Conductor		Range Taking* Bolts Per Conductor		Single Size Bolts Per Conductor
				Number	Dia. Inches	Number	Dia. Inches	Number	Dia. Inches	Number	Dia. Inches	Number	Dia. Inches
3/8	#4 thru 2/0	0.200 thru 0.399	1/2	2	3/8	3	3/8	4	3/8	2	1/2	2	1/2
1/2	3/0 thru 500	...	5/8 thru 1 1/8	3	3/8	3	3/8	4	3/8	4	1/2	4	1/2
3/4 thru 1	550 thru 800	...	...	3	3/8	4	3/8	4	3/8	4	1/2	4	1/2
1 1/4 thru 2	900 thru 2000	0.400 thru 1.412	1 1/4 thru 2 1/2	3	1/2	4	1/2	4	1/2	4	1/2	4	1/2
2 1/2	900 thru 2000	0.400 thru 1.412	...	3	1/2	4	1/2	4	1/2	4	5/8	4	5/8
3 thru 4	2250 thru 3000	1.413 thru 1.850	2 3/4 thru 5	3	5/8	4	5/8	4	5/8	4	5/8	4	5/8
4 1/2 thru 6	...	...	...	...	...	...	...	...	...	...	...	6	5/8

*Applies to cable only.
NOTE I - Each U bolt is counted as two bolts.
NOTE II - For shackle design (single casting wrap-around conductor), each bolt counts as two bolts.
NOTE III - When two different sizes of conductors are involved, the bolts specified for the smallest conductor may be used.
NOTE IV - When three bolts are specified, the following exceptions apply:
             a. Terminal lugs shall have a minimum of four bolts or the equivalent for a single conductor.
             b. Stud connectors shall have minimum of four bolts or the equivalent for the stud portion.
NOTE V - Bronze alloy bolts shall have a minimum tensile strength of 70,000 pounds per square inch and aluminum alloy bolts shall have a minimum tensile strength of 55,000 pounds per square inch.
NOTE VI - Nominal torque values shall be:

Diameter of Bolts, Inches	Nominal Torque Values
	Foot/Pound	Inch/Pound
3/8	20	240
1/2	40	480
5/8	55	660
3/8L	15	180
1/2L	25	300
5/8L	40	480

L - Lubricated

Examples Illustrating the Use of the Table In CC 1-4.06

EXAMPLE NO.1 - A straight coupler connector or a 90-degree 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

EXAMPLE NO.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. In this case and in accordance with Note III following the table, the manufacturer has the choice of using either four 1/2-inchdiameter bolts per conductor of four 5/8-inch-diameter bolts per conductor.

EXAMPLE NO.3 - A copper stud connector having a 1-1/8" - 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 the following bolts:

1. Four 3/8-inch-diameter bolts per conductor for the stud.
2. Four 1/2-inch-diameter bolts per conductor for the cable.

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