Originally Posted By: John Clayton
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First off i’m an IPC plumber so my info will be based on that code.
A trap arm extends 3-4 inches before any other connections or changes in direction doesn't prevent it from being an S-trap. However it does mean it isn't Crown vented which is the purpose of requiring a vent connection at or greater than the distance of 2X the pipe diameter away from the trap.
A fixture has an S-trap anytime the weir of the trap is above the connection of the trap arm to the vent. (exception *** If the drain is installed to the requirements for a combination drain vent then the weir of the trap is allowed to be above the connection of the "drain" to the vent. [Food waste grinders are not allowed on combination drain vent systems.]) Therefore the fixture in PIC. 1 has an S-trap. Not to mention an upside down P-trap (some inspectors are picky about drection of flow with unions/ground joints). Is that dishwasher connector plugged or just tubing sticking out of it? Did the tubular tee have a baffle in it? (shine your flashlight though it from behind). Nice j-box.
In line or running traps use to be prohibited in the code but I don't think I've seen it mentioned in the last couple releases. Anyway, the trap is installed backwards with the union on the wrong side. That makes the outlet higher than the inlet so water will probly set in the short horizontal section before the trap. Not sure but it looks like there is a second 90 degree elbow going horizontal to horizontal (requires a clean-out) back to the wall on the trap arm. If there is not a clean out there then the backwards trap creates a second problem by not allowing the J-bend to be removed for proper drain cleaning (removable trap = clean-out).
As already mentioned about the TPRV with the reduced size discharge pipe. Exposed NM cable not allowed per NEC. CPVC can connect directly to an elect. water heater but should do so using CPVC fittings with brass threads.