Running Surface Conduit From a Recessed Box

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  #1  
Old 10-11-17, 07:34 AM
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Running Surface Conduit From a Recessed Box

Provided below is picture of a recessed box on the wall of my house approximately 2' above the deck. I would like to tap into this recessed box for power to supply security cameras under the deck. I would like to run surface mounted PVC conduit from this box down below the deck, The recessed box is plastic. Is there a proper way to exit the box with THWN and transition to surface mounted PVC?

Thanks for the Help
 
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  #2  
Old 10-11-17, 09:28 AM
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You can use a weatherproof (FS) box extension. They come in PVC or metal diecast. The one in the picture has 4 hubs. They also make them with 2 hubs.

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Old 10-11-17, 09:51 AM
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PJmax, thank you as always for your assistance. Are these generally available at the big box home centers?
 
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Old 10-11-17, 10:03 AM
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Yes... the home improvement stores do have them.
 
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Old 10-11-17, 11:55 AM
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one last question - The home improvement center only had THHN in 50' rolls. When I asked the floor person for THWN, he said "its the same thing and you can use THHN for outdoor use". I held off buying pending confirmation. Based on my reading of posts on this forum I did not think that was correct.
 
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Old 10-11-17, 01:02 PM
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Don't ask the salesperson. Look at the printing on the wire. If it says THHN/THWN you are good to go. Almost all of the wire sold is dual rated. If it says only THHN on the wire then no it can't be used outside.

It is common for BigBox to mislabel dual rated wire as THHN in their promotional material and the person helping you may have had little or no electrical training and is going by BigBox's incorrect signage.
 
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Old 10-11-17, 01:09 PM
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Thanks Ray - Appreciate your response
 
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Old 10-11-17, 02:22 PM
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My "why" guess: Since THWN wire can be used both indoors and outdoors it make little sense for the manufacturer to make wire that is specifically THHN only. Maybe THHN is a bit cheaper and for specific commercial jobs such as wiring whole buildings it makes sense to go with THHN and for that need THHN might be manufactured and wholesaled but retail it makes little sense to stock and sell both.
 
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