UL 651B:2007 pdf download – Continuous Length HDPE Conduit.
5.3 The measurements from which the average outside diameters of a length of finished conduit are to be determined are to be made by means of a:
a) Machinist’s micrometer caliper that has a fLat•ended spindle, a flat anvil, and is calibrated to read directly to at least 0.001 inch or 0.01 mm;
b) Vernier caliper calibrated to read directly to at least 0.001 inch or 0.01 mm;
C) Vernier wrap tape, calibrated to read directly to at least 0.001 inch or 0.01 mm;
d) Tapered sleeve gauge accurate toil percent 01 its taper and ±0001 inch (±0.01 mm) of its diameter; or
e) Sleeve window gauge accurate to within ±1 percent of its lape and ±0.001 inch of its diameter.
5.4 When differences arise between measuring techniques, the vernier wrap tape is to act as the referee for determining compliance with the requirements for average outside diameters.
5.5 When employing a tapered sleeve gauge, the entrance and exit diameters of the gauge shall correspond to the maximum and minimum outside diameters for the trade size of conduit being measured.
5.6 When employing a sleeve window gauge, the window shall extend beyond the two scribed marls which shall represent the minimum and maximum permitted diameters.
5.7 The measurements from which the minimum and maximum outside diameters of finished conduit are to be determined are to be made by means of:
a) A machinist’s micrometer caliper that has a flat-ended spindle, a flat anvil, and is calibrated to read directly to at leasl 0.001 inch or 0.01 mm;
b) A vernier caliper calibrated to read directly to at least 0.001 inch or 0.01 mm; or
C) An out-of-roundness gauge accurate to 0.001 inch or 0.01 mm.
5.8 When differences arise between measuring techniques, the vernier caliper is to act as the referee for determining compliance with the requirements for minimum and maximum outside diameters
5.9 The measurements from which the wall thicknesses of a length of finished conduit are to be
determined are to be made by means of a machinist’s micrometer caliper that has a ratchet, a flat-ended spindle, and a hemispherical anvil. The caliper is to be calibrated to read directly to at least 0.001 inch or 0.01 mm.
5.10 Equivalent methods, tools, and measurement techniques are not prohibited from being employed to determine compliance with the above dimensional requirements when they are accurate to within ±0.001 inch or ±0.01 mm.
5.3 The measurements from which the average outside diameters of a length of finished conduit are to be determined are to be made by means of a:
a) Machinists micrometer caliper that has a fLat•ended spindle, a flat anvil, and is Calibrated to read directly to at least 0.001 inch or 0.01 mm;
b) Vernier caliper calibrated to read directly to at least 0001 inch or 0.01 mm;
c) Vernier wrap tape, calibrated to read directly to at least 0.001 inch or 0.01 mm;
d) Tapered sleeve gauge accurate toll percent of its taper and ±0.001 inch (±0.01 mm) of its diameter: or
e) Sleeve window gauge accurate to within ±1 percent of its lape and ±0001 inch of Its diameter.
5.4 When differences arise between measuring techniques, the vernier wrap tape is to act as the referee for determining compliance with the requirements for average outside diameters.
5.5 When employing a tapered sleeve gauge, the entrance and exit diameters of the gauge shall correspond to the maximum and minimum outside diameters for the trade size of conduit being measured.
5.6 When employing a sleeve window gauge, the window shall extend beyond the two scribed marks which shall represent the minimum and maximum permitted diameters.
5.7 The measurements from which the minimum and maximum outside diameters of finished conduit are to be determined are to be made by means of:
a) A machinist’s micrometer caliper that has a flat-ended spindle, a flat anvil, and is calibrated to read directly to at least 0.001 inch or 0.01 mm:
b) A vernier caliper calibrated to read directly to at least 0.001 inch or 0.01 mm; or
C) An out-of-roundness gauge accurate to 0.001 inch or 0.01 mm,
5.8 When differences arise between measuring techniques, the vernier caliper is to act as the referee for determining compliance with the requirements for minimum and maximum outside diameters.