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Appendix
www.aerocompact.com
24
APPENDIX
UL Certification Notes
The CompactMETAL system is certified by SolarPTL, LLC for grounding/bonding, fire classification, and
mechanical loading. SolarPTL, LLC is a Nationally Recognized Testing Laboratory (NRTL).
The CompactMETAL grounding method conforms to ANSI/UL 2703, and is approved for use with photo-
voltaic modules listed under ANSI/UL 1703 and/or ANSI/UL 61730, whichever applies, and complies with the
National Electrical Code, ANSI/NFPA 70. The individual parts within the solar array need to be electrically
bonded to existing DC ground paths via the use of a UL 467 approved grounding lug and via UL 467
approved bonding jumpers. The conductor size, type and temperature rating should be selected in accord-
ance with NEC 690.45 and NEC 250.122.1. The primary evaluation for grounding and/or mounting was per-
formed with the PV module type(s) listed below.
o
VSUN330-72P
Specific evaluations of other modules can be provided upon request and at cost (a minimum of two mod-
ules are required). In addition, more than four attachment points per module can be set to account for wind,
snow, and other types of loading.
For the fire rating / testing requirements for metal roofs, there is an exception in ANSI/UL 2703 section 11.1
that exempts fire testing and provides a Class A rating when the following conditions are met:
o
Type 1, Type 2, or Type 3 modules as defined by UL 1703 or UL 61730-2;
o
98% by weight of the racking is non-combustible per ASTM E136;
o
Installed over a Class A roof assembly of non-combustible roof covering, such as clay tile, concrete
tile, metal panels made from steel, minimum 28 Ga ferrous panels or shingles.
CompactMETAL meeting the above conditions shall be identified as having a Class A fire rating.
Load Rating
The CompactMETAL system design load ratings for a 72 cell PV module are:
a) Upward: 50 psf / 2.4 kPa
b) Downward: 71 psf / 3.4 kPa
c) Down-slope 10 psf / 0.48 kPa
Tested loads:a) Upward: 75 psf / 3.6 kPa
b) Downward: 106.5 psf / 5.1 kPa
c) Down-slope: 15 psf / 0.72 kPa
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