Spectrum Controls 1769sc-IF8u - Manual (Page 106)

96 Compact IO™ Universal Input Module
and sheath (sheaths are tied together). It should be noted that the isolation
is removed even if the sheaths are connected to chassis ground at a
location other than the module, since the module is connected to chassis
ground.
Spectrum Controls recommends that a grounded junction thermocouple
have a protective sheath made of electrically insulated material (for