WILEY is most widely recognized for the invention of the WEEB Washer (Washer, Electrical Equipment Bond). WILEY is dedicated to developing and providing innovative, high-quality solutions that revolutionize the solar industry. The WILEY engineers work closely with solar manufacturers and installers to develop products that address the evolving needs of the PV industry in bonding, grounding, and wire management. These products enable customers to install PV systems safely, efficiently, and cost effectively. BURNDY now offers the complete line of WILEY's unique solutions for Balance of System components for photovoltaic applications. Please visit- www.burndy.com for a full list of products and information.
WEEB Washer stands for "Washer, Electrical Equipment Bonding". The WEEB Washer family of products are used to bond solar modules to solar mounts. The mounts are then grounded so the entire assembly is grounded. The WEEB Washer family consists of six products (two of which are shown to the right): WEEB-9.5, WEEB-DMC, WEEB-PMC, WEEB-SMC, WEEB-UMC, and WEEBLug.
The WEEB-9.5 is used for bonding modules to ground and pole mount systems. The WEEB Lug provides a connection to the mounting system and has lay-in provision for an equipment ground conductor.
The remaining products are used for rail mount systems. For brevity we use WEEB-xMC to refer to any of the rail parts. The following list shows which part is used for each rail manufacturer.
All six products have been tested according to ANSI/UL467 and are listed with Intertek, a National Recognized Testing Laboratory (NRTL). The products use patent pending technology for bonding anodized aluminum surfaces together. Bonding PV modules to a mounting structure removes the need to wire the modules separately: just the mounting structure needs to be wired to ground.
The WEEB-9.5 is a washer used to bond the frame of a PV module to a pole or ground mounting structure. The WEEB-9.5 has fingers which will hold the part in any 3/8 inch hole. This allows the WEEB-9.5 to be inserted at the mounting locations and stays in place while the module is aligned. When the hardware is tightened, specially designed teeth on the WEEB-9.5 embed into the module and mounting structure, making a gas-tight connection.
A variant part, the WEEB-9.5NL, does not have the fingers. This allows the part to be used to join structural pieces of a mounting structure where only a single fastener is used and allows bolts up to 3/8 inch in diameter. The fingers are not needed because it is relatively easy to assemble a single fastener with the WEEB Washer, while for the case with modules, the large size of the module would make it difficult to position both the module and the WEEB Washer. See the installation instructions for detailed pictures.
The WEEB-xMC(s) are used for rail-mounted modules. Retaining features keep the parts on the rail while still allowing them to be correctly positioned beneath the modules.
Rounding out the product family is the WEEB Lug, a two piece set of washer plus lug. The washer has specialized teeth for making connection through an anodized aluminum surface. The lug allows the lay-in connection of wire after the lug has been mounted.
In order to meet the ANSI/UL467 specification, two WEEB Washers must contact each PV module. For the WEEB-9.5, that means two parts are needed for each module installed. For the WEEB-xMC parts, since each part contacts two modules, two WEEB-xMC are required per PAIR* of modules installed. (*two additional WEEB-xMC required for end module in odd-number rows).
For the WEEB-9.5NL, make sure two parts are in each conduction path. For example, on a pole mount, each module rail (the structural pieces to which the modules mount) is in turn mounted at two points to a cross-bar. One WEEB-9.5NL should be used at each of the points where the module rail mounts to the cross-bar.