TriPlex AL Resistance

[DBrenchley]

Anyone have a figure for the resistance of 2/0 AL triplex. I'm noting a 20vac drop over approx 750' of a mains run. I'm pretty confident I have an issue, but curious the impact resistance may have assuming the wire is fully intact.

THANKS

 

[don_resqcapt19]

This does not appear to be a how to question, so I have approved it.
I don't see why you can't take the resistance from Table 8, in Chapter 9 to do the calculation.

 

[gar]

230619-2224 EST

DBrenchley:

See :http://www.paigewire.com/wire_resistance-prop.aspx?AspxAutoDetectCookieSupport=1

#2 Aluminum is 0.261 ohms per 1000 ft at 68 F, and 0.319 ohms per 1000 ft at 167 F.

Thus, you might see a drop of about 0.32 * 100 A = 32 V on one wire at a 100 A load. Or a loop drop of 64 V at 100 A at 1000 ft.. Check and see if my data is correct.

.

.

 

[DBrenchley]

TY. Folks much appreciated

 

[DBrenchley]

This does not appear to be a how to question, so I have approved it.
I don't see why you can't take the resistance from Table 8, in Chapter 9 to do the calculation.

TY. Don't have access to NEC in Belize, but your ref's allowed a web search to locate the table. THX again

 

[don_resqcapt19]

TY. Don't have access to NEC in Belize, but your ref's allowed a web search to locate the table. THX again

While not very user friendly, you can view the NEC for free at the NFPA website. You do have to register with an email address. nfpa.org/70 then click on "free access".