Does 4/0 XHHW have to be XHHW-2 to have sunlight resistant rateing??? I think it does 2007 UL White book Page 366.
Someone wanna conferm for me.
I;d didn't see anything in 2005 Code 310.13.
I doesn't seem so, based on what I could find.
It appears that the cable or outer sheath may just need to be marked as sunlight resistant.
310.8 Locations in the 2008 NEC lists wire types suitable for dry, damp or wet locations, but has additional requirements for sunlight resistance.
According to the UL White Book, XHHW is 90-degree C rated for dry locations and 75-degree for wet locations, While XHHW-2 is 90-degree C rated for both wet and dry locations.
I highlighted the only areas I could find in the UL White Book that seem to reference XHHW cables and/or sunlight resisitance.
[p.386 2008 UL White Book]
THERMOSET-INSULATED WIRE (ZKST)
This category covers thermoset-insulated wire and cable (tabulated below)
which is flame retardant and rated 600 V, except for Types RHH, RHW and
RHW-2 which may be rated 2000 V. The voltage rating is marked on the
outer surface of the wire or cable.
RHW — Indicates a single conductor having a thermoset insulation, with
or without a nonmetallic covering, rated 75°C dry, 75°C wet.
RHW-2 — Indicates a single conductor with the same description as Type
RHW, except that it is rated 90°C dry, 90°C wet.
RHH — Indicates a single conductor with the same description as Type
RHW, except that it is rated 90°C dry only.
XHH — Indicates a single conductor having a cross-linked synthetic polymer
insulation with no overall covering provided, rated 90°C dry.XHHW — Indicates a single conductor with the same description as Type
XHH, except that it is rated 90°C dry, 75°C wet.XHHW-2 — Indicates a single conductor with the same description as
Type XHH, except that it is rated 90°C dry, 90°C wet.
SA — Indicates a single conductor having thermosetting silicone rubber
insulation and a nonmetallic covering rated 90°C dry, general use, 200°C
dry, special applications.
SIS — Indicates a single conductor having thermosetting insulation with
no overall covering provided rated 90°C dry, for switchboard wiring only.
D — Used as a suffix indicating a twin wire having two insulated conductors
laid parallel under an outer nonmetallic covering.
M — Used as a suffix indicating a cable having two or more insulated
single conductors twisted together under an outer nonmetallic covering.
This wire, in sizes mentioned below, may employ copper, aluminum, or
copper-clad aluminum conductors. Wire with copper-clad aluminum conductors
is surface printed ‘‘Cu-Clad Al’’ or ‘‘AL (CU-CLAD).’’ Wire with
aluminum conductors is surface printed ‘‘AL.’’
In addition to the required AWG or kcmil size, the metric equivalent may
be marked on the wire, e.g. ‘‘6 AWG (13.3 MM2)’’ or ‘‘13.3 MM2 (6 AWG).’’
Types RHH, RHW, RHW-2, XHH, XHHW, XHHW-2 and SA are Listed in
sizes 14 AWG through 2000 kcmil copper, and 12 AWG through 2000 kcmil
aluminum or copper-clad aluminum. Type SIS is Listed in sizes 14 through
4/0 AWG copper, and 12 through 4/0 AWG aluminum or copper-clad aluminum.
Thermoset-insulated Wire (ZKST)−Continued
Wire and cable employing compact-stranded copper conductors is so identified
directly following the conductor size wherever it appears (surface, tag,
carton or reel) by ‘‘compact copper.’’ The abbreviations ‘‘CMPCT’’ and ‘‘CU’’
may be used for compact and copper, respectively.
Tags, reels and cartons for products employing compact-stranded copper
conductors have the marking: ‘‘Terminate with connectors identified for use
with compact-stranded copper conductors.’’
Wire bearing multiple type designations is suitable for the temperature
associated with each use. For example, a wire marked ‘‘RHH or RHW’’ is
suitable for 90°C in dry locations, and 75°C in wet locations.
Wire marked ‘‘gasoline resistant’’ has been tested at 23°C when immersed
in gasoline. Wire marked ‘‘Oil Resistant I’’ and ‘‘Oil Resistant II’’ has been
tested for immersion in mineral oil at 60°C and 75°C, respectively.
Wire and cable marked ‘‘Cable Tray Use’’ complies with a Vertical-Tray
Flame Test. Wire and cable marked ‘‘Sunlight Resistant’’ complies with an
artificial weathering test.
The ‘‘Cable Tray Use’’ marking, with or without
the ‘‘Sunlight Resistant’’ marking, pertains to single conductor sizes 4
through 1 AWG for grounding conductors only, single conductor sizes 1/0
AWG and larger, and all sizes of multiconductor Types RHH, RHW, RHW-2,
XHH, XHHW and XHHW-2. Wire Types RHW, RHW-2, XHHW and
XHHW-2 intended to be installed on a messenger may be marked ‘‘Sunlight
Resistant’’ in all sizes.
Wire marked ‘‘VW-1’’ complies with a Vertical Flame Test; all others comply
with a Horizontal Flame Test.
Wire that complies with the Limited Smoke Test requirements specified in
UL 1685, ‘‘Vertical-Tray Fire-Propagation and Smoke-Release Test for Electrical
and Optical-Fiber Cables,’’ is surface marked with the suffix ‘‘-LS.’’
Wire and cable marked ‘‘-40 C’’ complies with a cold impact test conducted
at that temperature. This does not necessarily mean that the cable
can be easily installed at that temperature. Different installation conditions
and configurations require that care be taken when installing cable at low
Submersible Water Pump Cable — Indicates multiconductor cable in
which two, three or four Type RHW, RHW-2, XHHW or XHHW-2 conductors
are provided in a flat or twisted assembly. The cable is Listed in sizes
from 14 AWG through 500 kcmil copper, and from 12 AWG through 500
kcmil aluminum or copper-clad aluminum. The cable is tag marked ²For
use within the well casing for wiring deep-well water pumps where the
cable is not subject to repetitive handling caused by frequent servicing of
the pump units.² The surface of the wire may also be marked ‘‘Pump
Cable.’’ The cable has not been investigated for direct burial in the earth
unless the single conductors carry an additional ‘‘Type USE’’ or ‘‘Type USE-
For additional information, see Electrical Equipment for Use in Ordinary
The basic standard used to investigate products in this category is UL 44,
‘‘Thermoset-insulated Wires and Cables.’’
The Listing Mark of Underwriters Laboratories Inc. on the attached tag,
the reel, or the smallest unit container in which the product is packaged,
with or without the UL symbol on the product, is the only method provided
by UL to identify products manufactured under its Listing and Follow-Up
Service. The Listing Mark for these products includes the UL symbol (as
illustrated in the Introduction of this Directory) together with the word
‘‘LISTED,’’ a control number, and the product name as appropriate:
Thermoset-insulated wire that contains copper or copper-clad aluminum
conductors has the product name ‘‘Insulated Wire’’; thermoset-insulated
wire that contains aluminum conductors has the product name ‘‘Insulated