Dissimilar metals? 110.3(b) issue? Not suitable for the enviornment?
I had an issue with lugs used on a large solar panel project here, similar to what I think you are getting at. It took documentation from the lug mfg (OEM) to determine that that particular lug was NOT UL approved for exterior, exposed to the elements.
I was talking to Susanne on Friday and she also quoted 110.14 as did Mike. I have been failing AL lugs on pool heaters since becoming an AHJ 14 years ago. I called up a leading manufacture of pool equipment and asked them why they put AL lugs on pool heaters when it isn't allowed by the NEC. Their only response to me was that U* (You might be able to guess the letter) allows them to do it. I also called U* and asked them about it and asked them why they list the units with AL and they said that they would have to get back to me. That was 14 years ago and I am still waiting for that call back.
Harold: Based on your above post did Susan say 'NO, the alum lugs cannot be used'??
Did the manufacturer allude that the heater WITH the Al lug was a fully listed assembly. or were they saying the Al lug is 'listed'??
110.14 Electrical Connections. Because of different characteristics of dissimilar metals, devices such as pressure terminal or pressure splicing connectors and soldering lugs shall be identified for the material of the conductor and shall be properly installed and used. Conductors of dissimilar metals shall not be intermixed in a terminal or splicing connector where physical contact occurs between dissimilar conductors (such as copper and aluminum, copper and copper-clad aluminum, or aluminum and copper-clad aluminum), unless the device is identified for the purpose and conditions of use. Materials such as solder, fluxes, inhibitors, and compounds, where employed, shall be suitable for the use and shall be of a type that will not adversely affect the conductors, installation, or equipment.
Connectors and terminals for conductors more finely stranded than Class B and Class C stranding as shown in Chapter 9, Table 10, shall be identified for the specific conductor class or classes.
While I am here, does anyone know if the pool widget is UL approved for above ground pool bonding?
The pool widget is a short (nipple?)piece of metal that goes on the pool skimmer hose and has a regular bonding clamp on it. From the looks of the picture, the clamp looks like it is suitable for direct burial.