Sealing and Drainage Requirements for Type MI Cable

Sealing compound shall be used in Type MI cable termination fittings to _____.

a) prevent the passage of gas or vapor
b) exclude moisture and other fluids from the cable insulation
c) limit a possible explosion
d) prevent the escape of powder

See answer and applicable Code reference

The correct answer is: b) exclude moisture and other fluids from the cable insulation

Article 501 covers the requirements for electrical and electronic equipment and wiring for all voltages in Class I, Division 1 and 2 locations. Part II of this Article outlines the requirements for wiring. As specifically noted in Sec. 501.15, "Seals in conduit and cable systems shall comply with 501.15(A) through (F). Sealing compound shall be used in Type MI cable termination fittings to exclude moisture and other fluids from the cable insulation."

 

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