Electrical Bus Bar Torque Specs

Reduce torque by 20 when cadmium plated bolts are used.

Electrical bus bar torque specs. I am a firm believer in using manufacture torque requirements i have been in the mining industry as electrical troubleshooter for 30 years and over 90 of failures caused by tightening methods i also will move the wire around and torque again this has proven to help in maintaining torque specs when wires are moved into position to close cabinet. Typical hardware for bolting listed lugs to bus bars. Knowing required ampacity determine possible bus bar dimensions from the table. Ensure you know the torque specification.

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. Hexagonal bolt grade minimum sae grade 2 unc coarse thread. 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. For 60 hz current table gives bus bar cross sections which will probably be large enough for ampacities within each range.

Assume that required ampacity is 185 amp at 30 c rise. Ensure your electricians own and know how to use a torque wrench. Plated sae or stainless steel flat washers to be used on both sides. Connections can create electrical noise power quality issues by vibrating and creating arc at the connection.

Bus bar and terminal connections. Have the bus bars cleaned annually with clean dry. Torque for bus bar lugs is specified by lug size. Ul test assembly procedures ul486a b.

Use the torque specifications in. Typical busway installation. Then check table 1 to verify that size selected has the necessary ampacity. Tm 5 683 nawac mo 116 afjman 32 1083.

Diameter of bolt used should be compatible with hole in tang. Up facilities engineering electrical interior facilities.