[RE-wrenches] conductor properties of PV wire

[Bill Brooks]

Kirk,

 

There is no standard diameter for PV Wire so Chapter 9 table 1 must be used.
By the way, Table 1 is the code and the table in Annex C are not officially
the code. They are simply informational based on the standard nominal
diameters of various conductors. Many conductors have non-standard
dimensions, so using Annex C blindly, without checking the diameter, is not
a good idea. USE-2 and RHW-2 are good examples in addition to PV Wire where
the diameter does not match the Annex C tables.

 

Lastly, the 40% requirement in Table 1 is an absolute maximum allowed. Best
practice is to go no more than 75% of the maximum allowable (about 30%
fill). This is particularly important for rubberized insulators like RHW and
USE since 40% fill can be very difficult to pull through longer runs
regardless of how much lube is used.

 

Bill.

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kirk
Herander
Sent: Friday, February 07, 2014 8:23 AM
To: RE-wrenches
Subject: [RE-wrenches] conductor properties of PV wire

 

Are these listed in the 2014 code (diameter, ampacities, etc)? I don't see
them in the usual Ch. 9 or 310.15 tables. Am I missing it?

 

Kirk Herander

VT Solar, LLC

dba Vermont Solar Engineering

NABCEPTM Certified Inaugural Certificant

NYSERDA-eligible Installer

VT RE Incentive Program Partner

802.863.1202

 



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