Code Change Summary: A new code section was added to address tightening torque of electrical equipment.

Most seasoned electrician have seen the all too common cooked wire at the terminal of the circuit breaker or contactor due to the original connection being loose when first installed.

Heat is a byproduct of electricity. Tight terminations equals reduced heat.

Now the NEC^® makes mention of tightening torque for equipment terminals. Where a tightening torque values are given by the manufacturer, a calibrated torque tool must be used to achieve the indicated torque value, unless the manufacturer indicates an alternative method of achieving the required torque in the installation instructions.

Below is a preview of Article 110. See the actual NEC^® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2017 NEC^® edition of NFPA 70.