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WillK 05-20-2011 09:21 PM

Wire for outdoor outlet
 
So I'll be installing 2 outdoor outlets and a light fixture, all of these will be flush mounted to the wall. 1 outlet will be on brick, the other 2 fixtures will be on a vinyl siding mounting block. Both outlets will be in weathertight boxes, tamper-resistant GFCI with outdoor covers. The wires will go through knockouts in the back of the boxes and directly through the wall.

Is NM-B allowable for this or is this something where UF would be required? I have 12-2 NM-B on hand and 10-2 UF, but I'm using my UF for the travelers on a 3-way switch inside the house for a the light on the detatched garage and I'm not sure I'll have enough left for anything else.

Also, for the light, is it allowable to use an indoor junction box behind the vinyl mounting block? Otherwise I'll have to find a money tree because the finances are locked down tight and I'm trying to have everything ready for rough inspection by the end of the weekend. Last little details.

jamiedolan 05-20-2011 09:53 PM

Quote:

Originally Posted by WillK (Post 651779)
So I'll be installing 2 outdoor outlets and a light fixture, all of these will be flush mounted to the wall. 1 outlet will be on brick, the other 2 fixtures will be on a vinyl siding mounting block. Both outlets will be in weathertight boxes, tamper-resistant GFCI with outdoor covers. The wires will go through knockouts in the back of the boxes and directly through the wall.

Is NM-B allowable for this or is this something where UF would be required? I have 12-2 NM-B on hand and 10-2 UF, but I'm using my UF for the travelers on a 3-way switch inside the house for a the light on the detatched garage and I'm not sure I'll have enough left for anything else.

Also, for the light, is it allowable to use an indoor junction box behind the vinyl mounting block? Otherwise I'll have to find a money tree because the finances are locked down tight and I'm trying to have everything ready for rough inspection by the end of the weekend. Last little details.

If I understand you right and it's in the wall, afaik, you can use all the same indoor materials (boxes / wires), just use the outdoor cover / bubble as required.

I think there is a different GFCI that is required outdoors in the current code cycle, hopefully someone else can fill you in on the details that may apply.

WillK 05-20-2011 10:18 PM

This part perhaps?

http://ecmweb.com/mag/electric_code_changes_13/

Quote:

  1. 406.8 — RECEPTACLES IN DAMP OR WET LOCATIONS
  2. Receptacles installed in wet locations are now required to be weather resistant.
  3. (B) Receptacles in Wet Locations.
  4. (1) 15A and 20A Receptacles. All 15A and 20A receptacles installed in a wet location shall be within an enclosure that is weatherproof when an attachment plug is inserted, and all nonlocking 15A and 20A, 125V and 250V receptacles in a wet location shall be listed as weather resistant (click here to see Fig. 18).
  5. Exception: Receptacles subject to routine high-pressure washing spray may have an enclosure that is weatherproof when the attachment plug is removed.
  6. Author's comments:
  • Wet locations are those subject to saturation with water, and unprotected locations exposed to weather [Art. 100].

  • Exposed plastic surface material of weather-resistant receptacles must have UV resistance to ensure deterioration from sunlight does not take place or is minimal. In testing, receptacles are subjected to temperature cycling from very cold to very warm conditions and then additional dielectric testing. The rapid transition from the cold to warm temperature will change the relative humidity and moisture content on the device and the dielectric test ensures that this will not present a breakdown of the insulation properties.
  1. The change to this subsection was made in response to concerns that receptacles located outdoors are not always protected from detrimental conditions such as low temperatures, exposure to ultraviolet radiation (UV), physical damage, etc., and that weatherproof covers and enclosures do not always provide sufficient protection from the elements. The new exception allows receptacle covers in high-pressure spray washing areas to be of the type that is weatherproof when the attachment plug is removed. When a weatherproof while-in-use cover is used with high-pressure spray cleaning, liquid can spray into the enclosure through the cable openings. This change allows the use of a snap cover that does not have a cable opening in it while closed.

I hate to read anything into a product search on Home Depot's web site, but the only thing that turned up when I searched for weatherproof GFCI or weatherproof outlet is the covers and some Greenfield kits that include weatherproof box and cover and the respective receptacle, whether that be regular duplex or GFCI, nothing particularly indicating the receptacles were anything unusal. The pricing didn't seem greater than buying the components seperately.

I'd appreciate any clarification because I am a little uncertain now.

McSteve 05-20-2011 11:50 PM

The weather resistant GFCIs have sealed shutters over the slots, just like the tamper-resistant devices. (In fact, I suspect they are the same device with a higher pricetag.) I had to use them on the outside of my garage. The only visible difference is that weather resistant devices will be marked "WR" on the face of the device. And they do still need to be installed with an appropriate in-use cover.


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