There are reasons compression fittings are desired by engineers. It comes down to risk.
1. Most compression fittings are rated for ground bonding. Not many screw type fittings are. Without the ground wire in each conduit system, this may become a hazzard.
2. Many contractors do not overtighten the compression fittings. Many screw type I have inspected were over tightened.
3. Compression fittings are better around damp locations that use to be dry location.
4. Compression fittings avoid the set screw being stripped.
Dan Winkel
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