Will Thhn 2/0 Be Good For Service Mast

jar546

Chief Melt & Bottlewasher

• #1

If you were chosen to audit a new overhead service that used THWN-2 conductors and where the drip loop was placed at the mast head, y'all noticed that the clear outer blanket of the THWN-2 wire has separated from the insulation and was only hanging, would y'all approve the installation if everything else was code compliant?

jar546

Master Cook & Bottlewasher

• #2

Remember, not all wire is listed or labeled every bit "sunlight resistant" as required by 310.10(D). Unfortunately they only have to exist listed but are not required to be marked "sunlight resistant."

For example, U.s.a. Wire & Cable only lists its Black i/0 or larger equally sunlight resistant. That means no red or white exposed to sunlight and nothing nether 1/0 such as what you would run into on a temp service.

SouthWire, however says that their SIMpull THHN/THWN is listed and should be marked for "sunlight resistant" on wire #2awg and larger.

Full general Cablevision is the same every bit USA Wire & Cable with "sunlight resistant" mark for i/0 and larger in black insulation only.

Republic Wire really has UL blessing giving a "sunlight resistant" rating to all sizes and colors.

There are other articles out there and so for exposed mast weatherheads, you need to know what blazon wire, what color, what size and what manufacturer in order to cheque for compliance with 110.three(B) and 310.10(D)

jar546

Chief Melt & Bottlewasher

• #three

Add together CME Wire & Cable. They are listed for Sunlight Resistant SR for all colors sizes #8awg and larger.

jar546

Main Cook & Bottlewasher

• #4

Alan Wire (AW) lists their THHN/THWN as Sunlight Resistant for all sizes and colors.

Will Thhn 2/0 Be Good For Service Mast,

Source: https://www.thebuildingcodeforum.com/forum/threads/thwn-2-as-service-conductors-overhead-mast.27053/

Posted by: nicholsalwat1946.blogspot.com

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