Electrical Lug Torque Specs Chart Square D

Tightening torque in inch pounds.

Electrical lug torque specs chart square d.

I have been over tightening the lugs 250 in lbs busses and breakers 20 to 30 in lbs and probably not getting the egc and range wire neutral tight enough on the bus 35 in lbs. All of the major companies who manufacture electrical components have torque specifications for their equipment ask for it. Tightening torque values for ilsco sockethead screw connectors. Do you have a torque chart for mechanical lugs.

Square d s site has the label and it said 50 in lbs. Each of our parts has the opportunity to have a separate torque associated with it. For instance a square d 20 amp homeline breaker if my memory serves me correctly requires 22 inch pounds of torque. Features ł single or three phase construction ł 30œ 400 a main lug or main circuit breaker ratings.

Sometimes it could be compression but in this case it is torque. Loose lugs create a high resistance connection to the bus bar and electrical resistance in metal causes heat. Our website allows the users to find the specific information sheet they need. The service i put in last week was the first i had installed properly using the torque specs listed in the panels and on the cb s.

Ensure you know the torque specification. They are designed to meet residential commercial and industrial requirements to protect electrical systems equipment and people. The square d panels i m using have a hex nuts that can only be tightened with an hex tool aka allen key wrench. Qofi circuit breaker load centers from square dfi are underwriters laboratories ul listed panelboards.

Connections can create electrical noise power quality issues by vibrating and creating arc at the connection. Sometimes there are multiple torques for the lug. Ensure your electricians own and know how to use a torque wrench. 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.

Internal socket size across flats inches. Main lug torque specs. Sorry for the slow reply but square d site was flaky yesterday rule of thumb keep your thumb from under the hammer. Anything tighter than this as mentioned crushes the conductor and creates a potential hotspot leading to an overheated connection.

Tightening torque values for ilsco mechanical screw connectors. I have torque wrenches for normal sockets but not for a hex nut. This is not a lot of torque and the connection actually feels loose to most electricians.