Informative Annex I, like the other Annexes in the 2011 NEC, is not part of the requirements of the Code. It is included for informational purposes only. The torque tables are to be used in the absence of manufacturer's instructions on the equipment.
There are three tables in Annex I. Table I.1, Tightening Torque for Screws. Table I.2, Tightening Torque for Slotted Head Screws Smaller Than No. 10 Intended for Use with 8 AWG or Smaller Conductors. Table I.3, Tightening Torque for Screws with Recessed Allen or Square Drives.
Each Table has the metric measurement and the standard measurement (inside parenthesis). The standard measurements are read as inch-pounds. The Tables are taken from UL Standard 486 A-B. The values from both the A and B Standard are given, with separate A and B columns. The B column lists tighter torque values.
Table I.1 and I.2 are divided by the slot width or slot length of the screw. A separate section of Table I.1 is for connectors with hexagonal heads. Use the left hand column in Table I.1 to select a connector based on the size of the wire in the connector. Read across the table to find the correct torque. For example, the suggested torque for a split-bolt connector used with 2/0 conductors is 385 inch-pounds, from the B column.
