What is better for a ground system - THW or THWN?

[downtownfool]

All i find on the two is this:



THW (5) 75¡C 167¡F 90¡C 194¡F
DRY & WET LOCATIONS SPECIAL APPL. WITHIN ELECTRIC DISCHARGE LIGHTING EQUIPMENT LIMITED TO 1000 OPEN-CIRCUIT VOLTS OR LESS, (SIZE 14-8 ONLY AS PERMITTED IN SECTION 410-31).
MOISTURE AND HEAT-RESISTANT THERMOPLASTIC



THWN (5) 75¡C 167¡F DRY AND WET LOCATIONS


Is there a real benefit of one over the other with regard to buried ground system?

 

[davidbeach]

Personally, I'd use bare for a buried ground system.

 

[downtownfool]

I'm told they can't due to catholic protection and other reasons.

 

[davidbeach]

The whole point is ground contact. Insulated conductors aren't so hot in that arena.

 

[waross]

When faced with a choice such as this, I generally use the cable type that is in stock locally. That is unless there will be a lot of buried electric discharge lighting equipment. And I echo davidbeach's comments.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[DRWeig]

Look up ufer ground if you're trying to avoid soil contact.

Best to you,

Goober Dave

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[resqcapt19]

The THW insulation will be thicker than the THWN and more resistant to physical damage, but not sure if there is any real difference in the resistance to ground in a buried installation over time.