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CR LAURENCE Z-SERIES GLASS CLAMPS (03/27/2014) Page 19 of 19 <br /> HOLE CONDITIONS: <br /> Hole size as specified for selected clamp. <br /> Location of hole from edge of glass as shown in the glass fabrication template for the selected <br /> clamp. <br /> Minimum distance from corner to periphery of hole is 6.5 times the glass thickness: <br /> Distance from corner to centerline of the clamp is: <br /> For 1/4" glass: e=6.5*0.25"+0.5"/2= 1.875" = 1 7/8" <br /> for 5/16" glass: e= 6.5*(5/16) +0.5/2=2.281" = 2 9/32" <br /> for 3/8"glass: e= 6.5*(3/8) +0.5/2=2.6875" =2 11/16" <br /> for 1/2" glass: e= 6.5*(0.5) + (9/16)/2= 3.531 =3 17/32" <br /> When compliance with ASTM C 1048 is required for the holes then the holes shall be fabricated <br /> as finger slots from the side or the clamps oriented so that the through glass pin is not required. <br /> ALTERNATIVE CLAMP ARRANGEMENTS <br /> The clamps may be alternatively attached to the top and bottom rail or a combination of <br /> attachment to posts and rails so that the glass is adequately supported. <br /> The support configuration must be able to provide the support to the corner or glass edges. <br /> Examples of acceptable configurations are: <br /> Top of glass set in top rail glazing pocket and Z-clamps to post near bottom corners with through <br /> glass pins. <br /> Top of glass set in top rail glazing pocket and two Z-clamps to bottom rail without holes through <br /> glass. <br /> Top of glass set in two Z-clamps to top rail and two Z-clamps to bottom rail,neither top nor <br /> bottom clamps require holes through glass. <br /> Top of glass set in two Z-clamps to top rail without holes through glass and bottom edge set in <br /> glazing pocket in bottom rail. <br /> Top of glass set in two Z-clamps to post without holes through glass and bottom edge set in <br /> glazing pocket in bottom rail. <br /> Top of glass set in two Z-clamps to post without holes through glass and two Z-clamps to bottom <br /> rail without holes through glass. <br /> Note: Top/grab rail at or above the top of the glass is required for guard applications. <br /> EDWARD C.ROBISON,PE <br /> 10012 Creviston Dr NW <br /> Gig Harbor,WA 98329 <br /> 253-858-0855/Fax 253-858-0856 - .bison@narrows.com <br /> Z7 <br />