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for fitting leakage, and notes that a brass nipple may be permitted to connect copper to steel in some building code jurisdictons. This article describes the building code and practical requirements for a dielectric fitting when connecting copper piping to steel pipes or steel fittings such as at the top of a water heater. The pipe could have been defective from day one the pipe could be a lower quality thin-walled material more vulnerable to corrosion the pipe could have been damaged in transport or installation or even during the slab pour just as you posed, on occasion. To that end, I'm trying to figure out how to accomplish both mechanical and electrical protection. Using a diaelectric fitting or an approved brass fitting to connect these two metals, or more commonly, using plastic or bronze fittings at the joint between these two metals will avoid future corrosion and leaks. Reply: I appreciate the discussion but it seems we disagree about the locus of galvanic corrosion in plumbing systems and perhaps you didn't know that building codes require both dielectric fittings (or in some locales a brass nipple) connecting copper to steel pipes. A jumper wire is installed to assure that the building metal plumbing pipes are safely grounded to earth. I think additional consideration on this topic is warranted. Another reason we may not always see rapid galvanic corrosion at copper to steel pipe connections is the use of teflon tape (or less-so, pipe dope or sealant compound) that provides a thin non-metallic contact surface between the two dissimilar metals. I guess there's no problem here (and in fact no dielectric union needed) because there's no steel immersed in electrolyte with the copper. 559 2 (part 2010: Ord.
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If one of these is water piping it is tested and must show less than 25 ohms of resistance to earth. The 5 off 25 applebees coupon water has been ruled out so it has to be something else the pin hole was from the inside out and my house water connections are green and blue. Teflon tape or pipe dope may slow the rate of galvanic corrosion. If not, the system is waiting to electrocute the building occupant when s/he touches the live water/toaster in the sink and perhaps a nearby metal faucet, radiator, or other component that is ultimately connected to earth. 252.95pp-52, only 1 left in stock! We also provide a, master index to this topic, or you can try the page top or bottom. I though it was the water but had the water dept lab test my water and all was normal. Current NEC Citations on grounding water piping NEC 250.50 "All grounding electrodes as described in 250.52(A 1) through (A 6) that are present at each building or structure shall be bonded together to form the grounding electrode system." 250.52(A 1) Metal Underground Water Pipe.
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