D. Configuration of Terminals on an MS27212 Terminal Block
Refer to Paragraph 3.N. for the terminal torque values for the terminals on an MS27212 terminal block.
When a terminal lug is installed on the terminal block, make sure that the terminal lug cannot be moved
in the direction that loosens it.
For the MS27212-2 terminal block:
• The size of the stud hole in the terminal lug must be the same as the size of the stud
• The maximum number of terminal lugs that can be attached to a stud is 4
• A maximum of 2 terminal lugs that have 8 AWG or larger wire can be installed on one stud on
each side of the terminal block
• The largest terminal lug must be installed first at the base of the stud
• The remaining terminal lugs must be installed in order of decreasing size.
• For size 1/4 and larger stud, the bottom surface of the tongue of the lug is against base of the
terminal board
• For size 10 and smaller studs, the top surface of the tongue of the lug against base of the
terminal board is permitted.
Refer to:
• Figure 3 for more than one terminal on a stud
• Figure 4 and Figure 5 for the different configurations of one or more terminals on a stud
• Figure 6 for the bus configuration.
NOTE: To make the installation of one or more terminals easier, the top of the terminal can be turned
toward the bottom of the stud.
For terminal block hardware that is not used, these conditions are applicable:
• A plain nut must be tightened sufficiently with a steel lock washer under the nut
• A plain nut must be held in position with a self-locking nut
• A self-locking nut must be tightened so that a minimum of one thread of the stud goes through the
nut
• A terminal screw must be tightened sufficiently with a steel lock washer under the head of the
screw.
NOTE: It is not necessary to install a self-lock nut at the bottom of a stud on the MS27212 terminal
block.
NOTE: If it is necessary, the legs of an MS18029 terminal block cover can be cut to make a hole for
the wire barrel of a terminal.
ELECTRICAL CONNECTION OF EQUIPMENT AND INSTALLATION OF TERMINAL LUGS
707, 727-787
STANDARD WIRING PRACTICES MANUAL
20-30-00
Page 6
Oct 15/2015D6-54446
ECCN 9E991 BOEING PROPRIETARY - See title page for details
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