Why we use copper on relief valve discharges

Mad Dog_2

20260111_110205.jpg

Mad Dog_2

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hot_rod

I think the current plumbing codes allow relief lines to be any material suitable to the discharge temperature? So I see the plastic tubes being passed now, looks like the same material as the dip tubes.

Old codes required metallic discharge tube as I recall.

Mad Dog_2

I dont use pvc for discharge, but better than this! Scary. Mad Dog

Larry Weingarten

Hi, A benefit of copper is you don't get galvanic corrosion where copper meets the brass valve. A detail is the line is supposed to be run down to no more than six inches off the floor, so people are less likely to get burned. No doubt @EBEBRATT-Ed could comment on the wiring in the first photo too. 🤨

Yours, Larry

pedmec

mass plumbing code

10.14.(6).(f).2.c

c. The discharge outlet if the T&P relief valve shall be full-size and pipe using non-ferrous material or tubing rated to withstand the maximum relief valve temperature with no shut-off, toa fixture or a point to within twelve inches of the floor.

mattmia2

https://forum.heatinghelp.com/discussion/comment/1881797#Comment_1881797

in michigan it is worded such that water heaters need to be metallic but boilers just need to be rated for the working temp of the system.(at least as of the 2015 code we've been using for a decade, the new code may be different, not sure if we've actually are using it yet, it was adopted then some lawsuit paused it)

EBEBRATT-Ed

@Larry Weingarten

Octagon box with no cover and 4 runs of romex in it. Two runs of romex in one clamp only allowed if the connector is listed for it. Looks like one of those ground clips on the box edge to ground the box. I hate them but its code so I will let it go this time. But don't do it in my town ever again. And no romex staples seen. The romex has to be secured within 12 " of a box. I will have to look up the box fill for 4 #14s and 4 Grounds in a 4" octagon but I think its ok.

@pedmec

MA. is probably stricter than most states.

mattmia2

https://forum.heatinghelp.com/discussion/comment/1881905#Comment_1881905

how exactly does one find the listing for a romex clamp? they come loose out of a bin…

EBEBRATT-Ed

@mattmia2 , everything has a listing. Even zip tys have to be listed for electrical

	842 Product Information Cable Connectors for NM • SE • SEU Cable

Basic Information

Part Number	842
Description	NM cable connector zinc die-cast. 2 screw clamp type. Handles combinations of NM cable from #14 to #10. Up to 2 NM cables at one time. 3/4 Knockout. Also handles one 8/2, two 4/2 service cable.
UPC-A	018997008428
Unit Packaging	50pcs
Standard Packaging	500pcs
Country of Origin
Listing