Originally Posted By: jmcginnis This post was automatically imported from our archived forum.
They are required to be bonded if they are copper. in some towns in my area. It is my understanding that bonding them at the WH removes the possibility for “electrical potential (voltage)” between the hot and cold pipes. Would appreciate if someone else could weigh in on this question as to why the bonding is required and or recommended.
Originally Posted By: bbadger This post was automatically imported from our archived forum.
IMO the NEC is very vague on this.
The metal water piping system shall be bonded is pretty much all the NEC says.
Some areas require a bonding jumper at the water heater some do not.
The mixing valve at a tub / shower usually makes a good bond between the hot and the cold.
The NEC handbook says this.
Quote:
If it cannot reasonably be concluded that the hot and cold water pipes are reliably interconnected, an electrical bonding jumper is required to ensure that this connection is made. Some judgment must be exercised for each installation.
