To connect the EMT conduit to a box or enclosure or to couple two ends of the EMT conduit, rain-tight situations need the use of Crouse-Hinds series connectors and couplings. Water seepage into the conduit, box, or enclosure is prevented by the design.
As long as the conduit is galvanized and you utilize all fittings that are designated for wet environments and are protected from corrosion, EMT can be used in wet places. As long as the fittings are marked as being for use, EMT can be applied to the concrete.
To connect the EMT conduit to a box or enclosure or to couple two ends of the EMT conduit, rain-tight situations need the use of Crouse-Hinds series connectors and couplings. Water seepage into the conduit, box, or enclosure is prevented by the design.
Therefore the correct answer is option a. compression
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