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#206402 06/28/12 10:16 PM
Joined: Feb 2002
Posts: 2,233
H
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Is an aluminum lug mounted on a pool heater allowed by the NEC?

Joined: Apr 2002
Posts: 7,283
Likes: 3
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Harold:

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.



John
Joined: Mar 2007
Posts: 101
M
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Also 110.14 Electrical Connections. And 680.9 says loads subdived not to exceed 48 amps & protected not over 60 amps...

Joined: Feb 2002
Posts: 2,233
H
Member
John,

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. smile

Joined: Apr 2002
Posts: 7,283
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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.


John
Joined: Jul 2004
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G
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Harold, send a note to Jeff and ask him about it.

Jeffrey.Fecteau@ul.com


Greg Fretwell
Joined: Feb 2002
Posts: 2,233
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John,

She said that the Al lug can fail inspection because of sec. 110.14 of the NEC as you have stated above.

Joined: Feb 2002
Posts: 2,233
H
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Greg,

I will try to shoot off an e-mail today if I get the chance.

However the DCA of NJ stated that the pool manufacture has been told to remove the AL lugs and that they will tell them again.

Joined: Feb 2002
Posts: 2,233
H
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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.

Joined: Apr 2002
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Harold:
The ones I have seen are UL marked. The lug appears to have 'DB' stamped.


John
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