Electrical Bus Bar Torque Specs

Plated sae or stainless steel flat washers to be used on both sides.

Electrical bus bar torque specs.

Diameter of bolt used should be compatible with hole in tang. Reduce torque by 20 when cadmium plated bolts are used. Bus bar and terminal connections. Tm 5 683 nawac mo 116 afjman 32 1083.

Then check table 1 to verify that size selected has the necessary ampacity. For 60 hz current table gives bus bar cross sections which will probably be large enough for ampacities within each range. Have the bus bars cleaned annually with clean dry. Importance of torque in bussing a critical concept in understanding bus lug torque specifications is the fact that the pressure of the lug connection has more to do with lowering the resistance of the electrical connection than the size of the lug itself.

Typical busway installation. Ul test assembly procedures ul486a b. Typical hardware for bolting listed lugs to bus bars. Assume that required ampacity is 185 amp at 30 c rise.

The most common size used is 1 2 13 but 5 8 11 hardware is used for some very large joints and sizes. All of the major companies who manufacture electrical components have torque specifications for their equipment ask for it. Ensure your electricians own and know how to use a torque wrench. Zinc plated to retard corrosion and installed with the proper torque this hardware has a long history of satisfactory performance with both copper and aluminum bus bars.

Use the torque specifications in. Torque for bus bar lugs is specified by lug size. 882 853 3 way bus bar 876 199 terminal mount 901 325 red cover 3x m8 nuts assembly instructions place the battery terminal on the stud bus bar assembly for 2 positions bolt the two pieces together place z case fuses over standard fuse sizes. Hexagonal bolt grade minimum sae grade 2 unc coarse thread.

Up facilities engineering electrical interior facilities. Connections can create electrical noise power quality issues by vibrating and creating arc at the connection.