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U L 651 A

standard for Safety

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Northbrook, Illinois *(708) 272-8800 Melville, New York *(516) 271-6200 Sar ,

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U n d e rw rite rs L a b o ra to rie s Inc. .,,

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Clara, California • (408) 985-241

Resnarch Triangle Park, Norm Carolina * (919) 549-1400 Cnrtms, Washington*(300) 817-5500

Underwriters Laboratories Inc., founded in 1894, is chartered as a not-for-profit organisation without capital stock, under the laws of the state of Delaware, to establish, maintain, and operate laboratories for the examination and testing of devices, systems and materials to determine their relation to hazards to life and property, and to ascertain, define and publish standards, classifications and specifications for materials, devices, products, equipment, constructions, methods, and-systems affecting such hazards. UL Standards for Safety are.developed under a procedure which provides for participation and comment from the affected public as well as industry. The procedure takes into consideration a survey of known existing standards and the needs and opinions of a wide variety of interests concerned with the subject matter of the standard. Thus manufacturers, consumers, individuals associated with consumer-oriented organizations, academicians, government officials, industrial and commercial users, inspection authorities, insurance interests and others provide input to UL in the formulating of ƯL Standards for Safety, to keep them consonant with social and technological advances.

A not-for-profit organization dedicated to public satety and committed to quality service

9

AUGUST 24, 1995 1

UL 651A Standard for TYPE EB and A Rigid PVC Conduit and HDPE Conduit

First Edition - May, 1981 Second Edition-August, 1989 Prior to the first edition, the requirements for the products covered by this standard were included in the first, second, and third editions of the Standard for Rigid Nonmetallic Conduit, UL 651. Third Edition August 24, 1995 ).

An effective date included as a note immediately following certain requirements is one established by Underwriters Laboratories Inc. The Department of Defense (DoD) has adopted UL651A on October 11,1989. The publication of revised pages or a new edition of this standard will not invalidate the DoD adoption. Revisions of this standard will be made by issuing revised or additional pages bearing their date of issue. A UL Standard is current only if it incorporates the most recently adopted revisions, all of which are itemized on the transmittal notice that accompanies the latest published set of revision pages. ISBN 1-55989-868-2 COPYRIGHT © 1981, 1995 UNDERWRITERS LABORATORIES INC.

- -in jL -

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4 AUGUST 24, 1995

TYPE EB AND A RIGID PVC CONDUIT AND HDPE CONDUIT — UL 651A

3

CONTENTS

FOREWORD INTRODUCTION

1 Scope : ............................................................................. 2 General ...................................................................................

5 6

CONSTRUCTION 3 General ....................................................................................................................... 6 4 PE Conduit and Fittings Other ThanBends ................................................................... 13 5 PVC and High-Density PE Bends....................................................... 15 PERFORMANCE 6 General ................................................... '............................ ................................... 7 Tensile Strength of PVC and High-Density PE Conduit.................................................. 8 Deflection of Type A PVC Conduit and High-Density PE Conduit Under Heat and Load . . 9 Extrusion-Process Test on PVC Conduit ...................................................................... 10 Low-Temperature Handling of PVC and High-Density PE Conduit................................ 11 Low-Temperature Handling of High-Density PE Couplings............................................ 12 Water Absorption ................................................. 13 Resistance of Type A PVC and High-Density PE Conduit to Crushing ................... 14 Stiffness of Type EB PVC Conduit............................................................................. 15 Resistance of PVC and High-Density PE Conduit to Impact.......................................... 16 Identification of PVC and High-Density PE Compounds................................................ 17 Dimensional Stability and Crushing Strength of High-Density PE Couplings for High-Density PE Conduit............................................. 18 Bending Test of Joints in High-Density PE Conduit'...................................................... 19 Tests on Integral Couplings................: ..................................................................... 20 Axial-Pull Test on Joints in High-Density PE Conduit....................................................

16 1f t , 2 ^*^ 25 26 26 26 27 « 28 29 30 30 31 32 32

MARKINGS 21 Details .....................................................................................................................

33

SUPPLEMENT SA - PRODUCTION PROGRAM AND VERIFICATION OF COMPLIANCE SA1 SA2 SA3 SA4 SA5 SAp SA7 SA8

Scope ....................................................................................................................SA1 Glossary ........................................................................................ SA1 Manufacturer’s Program................................................................................. .. • • • SA2 Manufacturer’s Follow-Up Control Requirements for Type EB and A Rigid PVC Conduit and HDPE Conduit, Elbows, and Bends .............. SA3 Sample Selection Procedure................................................ SA6 Follow-Up Inspection Program ............................................ SA9 Follow-Up Test Program 7.......................................................................................SA13 Markings .............................................................................................................. SA14

4

TYPE EB AND A RIGID PVC CONDUIT AND HOPE CONDUIT

UL 651A

AUGUST 24, 1995

FOREWORD A. This Standard contains basic requirements for products covered by Underwriters Laboratories Inc. (UL) under its Follow-Up Service for this category within the limitations given below and in the Scope section of this Standard. These requirements are based upon sound engineering principles, research, records of tests and field experience, and an appreciation of the problems of manufacture, installation, and use derived from consultation with and information obtained from manufacturers, users, inspection authorities, and others having specialized experience. They are subject to revision as further experience and investigation may show is necessary or desirable. B. The observance of the requirements of this Standard by a manufacturer is one of the conditions of the continued coverage of the manufacturer’s product. c. A product which complies with the text of this Standard will not necessarily be judged to comply with the Standard if, when examined and tested, It is found to have other features which impair the level of safety contemplated by these requirements.

D. A product employing materials or having forms of construction differing from those detailed in the requirements of this Standard may be examined and tested according to the intent of the requirements and, if found to be substantially equivalent, may be judged to comply with the Standard. E. UL, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufacturer or any other party. The opinions and findings of UL represent its professional judgment given with due consideration to the necessary limitations of practical operation and state of the art at the time the Standard is processed. UL shall not be responsible to anyone for the use of or reliance upon this Standard by anyone. UL shall not incur any obligation or liability for damages, including consequential damages, arising out of or in connection with the use, interpretation of, or reliance upon this Standard. F. Many tests required by the Standards of UL are inherently hazardous and adequate safeguards for personnel and property shall be employed in conducting such tests.

AUGUST 24, 199S

TYPE EB AND A RIGID PVC CONDUIT AND HDPE CONDUIT

UL 651A

5

INTRODUCTION 1 Scope

1.1

These requirements cover: a) , Type EB and Type A extruded rigid PVC (polyvinyl chloride) electrical conduit and fittings consisting of elbows and other bends made from and for use with these types of conduit. b) Extruded rigid Schedule 40 high-density PE (polyethylene) electrical conduit and the following fittings: 1)

Elbows and other bends from and for use with this conduit and

2)

Rigid high-density PE couplings for use with this conduit.

The designations Type EB", 'Type A”, and "Schedule 40" refer to USA trade sizes of conduit having iron-pipe size outside diameters and specific wall thicknesses. 1.2 The PVCand PE conduit and fittings mentioned in 1.1 are intended for i:cn at 5 0°c (122°F) and lower ambient temperatures. Type A PVC conduit and fittings and Schedule 40 PE conduit and fittings are intended for use with 75°c (167°F) wiring. Type A and Type EB PVC conduit and fittings, where encased in concrete in trenches outside of buildings, may be used with 90°c (194°F) wiring. Schedule 40 PE conduit and fittings, where directly buried or encased in concrete in trenches outside of buildings, may be used with 90°c (194° F) wiring. 1.3 The conduit and fittings covered in these requirements are intended for use as rigid nonmetallic raceway for wires and cables in accordance with the National Electrical Code. 1.4 Type EB (encased burial) PVC conduit is intended for encasement in concrete in trenches outside of buildings. Type A PVC conduit is intended for encasement in concrete in any location. 1.5 Unless the wording of a requirement that applies to PVC conduit and fittings specifically limits the requirement to Type EB or to Type A, each such requirement in this standard applies to both types. 1.6 Outlet boxes and covers that are rigid PVC or of another nonmetallic material and are for use with the rigid PVC conduit and fittings covered in these requirements are covered separately in the Standard for Nonmetallic Outlet Boxes, Flush-Device Boxes, and Covers, UL 514C. 1.7 Couplings, adapters, and similar fittings that are of rigid PVC and are for use with the rigid conduit and fittings covered in these requirements are covered separately in the Standard for Conduit and Outlet Boxes, UL 514A. 1.8 Schedule 40 and Schedule 80 rigid PVC electrical conduit and fittings consisting of elbows and other bends made from and for use with this conduit are covered separately in the Standard for Schedule *.0 and 80 Rigid PVC Conduit, UL 651. 1.9 Irppregnated-fiber electrical conduit and fittings are covered separately in the Standard for Impregnated-Fiber Conduit, U L 543.

1.10 The rigid PVC conduit and fittings covered in these requirements are intended to be joined to rigid PVC boxes and fittings in the field by means of a cement that is or contains a solvent for polyvinyl chloride.

TYPE EB AND A RIGID PVC CONDUIT AND HDPE CONDUIT

6

UL 651A

AUGUST 24, 1995

1.11 Schedule 40 high-density PE conduit is for aboveground use where encased in not less than 2 inches or 50 mm of concrete and for underground use by direct burial or encasement in concrete. 1.12 When using a sleeve window gauge, the end of the conduit shall be visible between the two scribed marks when the conduit is inserted into the gauge. 1.13 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involve a risk of fire, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements as determined necessary to maintain the acceptable level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard cannot be judged to comply with this standard. Where considered appropriate, revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard. 2 General 2.1

Units of measurement

2.1.1 If a value for measurement is followed by a value in other units, the use or recognition of either value can be expected to provide equivalent results in the application of such requirements. 2.1.2 Unless otherwise indicated, all voltage and current values mentioned in this standard are root-meansquare (rms). 2.2

Undated references

2.2.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. CONSTRUCTION 3 General

3.1 The compound of which rigid PVC conduit and fittings are made shall equal or exceed the cell classification 12123 as described in Standard Specification for Rigid Poly (Vinyl Chloride) (PVC) Compounds and Chlorinated Poly (Vinyl Chloride) (CPVC Compounds), ASTM D 1784-31. The compound of which rigid high-density PE conduit and couplings and other fittings are made shall equal or exceed the cell classification PE 336620C as described in Standard Specification for Polyethylene Plastics Pipe and Fittings Materials, ASTM D 3350-84. All conduit and fittings shall be made and furnished with the degree of uniformity and quality of workmanship that are practicable in a well-equipped factory. 3.2 Conduit and fittings shall provide a smooth raceway for the pulling in of wires and cables. They shall not have any features that can abrade or otherwise damage wires and cables. The outside surfaces of conduit and fittings shall be smooth and without any chips, blister, cracks, or other defects. There shall not be any tendency for conduit or fittings to peel, scale, flake chalk, or crumble.

AUGUST 24, 1995

3.3

TYPE EB AND A RIGID PVC CONDUIT AND HDPE CONDUIT — UL 651A

7

Both ends of each length of conduit shall be perpendicular to the longitudinal axis of the conduit.

3.4 PVC conduit and elbows and other bends shall not be threaded. There shall not be any taper to the conduit or bend unless one end is formed as an integral coupling. In that case, only the interior surface of the Integral coupling may be tapered. 3.5 For specific applications or uses lengths of PVC conduit may be shipped from the factory with or without PVC couplings or with a PVC adapter instead of a coupling, and a PVC coupling with a center stop need not be cemented to the conduit when the conduit is shipped but may be separately packaged. 3.6 For general use, a PVC coupling or similar fitting shall be cemented, heat-fused, or molded (see 3.24) to one end of each length of PVC conduit before the conduit Is shipped from the factory. If a stopless coupling is used, the end of the conduit shall be within 1/8 inch or 3 mm of the center of the coupling. 3.7 Limits on the wall thickness and outside diameter of pvc and PE conduit are specified in inches in Table 3.1 and in millimeters in Table 3.2. 3.8 Each length of conduit on which measurements are made is to be finished, smooth and clean wherever it is to touch any part of a measuring device or tool. While measurements are being made, the conduit and the air around it are to be in thermal equilibrium with one another at a temperature of 23.0 ±2.0°c (73.4 ±3.6°F). All of the average and individual outside diameter measurements are to be performed at the center and at least one end of the conduit. 3.9 The dimensions of an integral coupling on Type EB PVC conduit shall comply with Table 3.3 (Inches) or Table 3.4 (mms) when measured with a machinist’s inside micrometer caliper (socket diameter) having a ratchet, a machinist’s inside depth gauge (socket depth), and the machinist’s micrometer caliper (socket wall thickness) mentioned in 3.10. Each instrument is to be calibrated to'read directly to at least 0.001 Inch or 0.01 mm. 3.10 The measurements from which the average outside diameters of a length of finished conduit are to be determined for comparison with the limits specified in inches in Table 3.1 or in millimeters in Table 3.2 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 to ±1 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 tape and ±0.001 inch of its diameter. 3.11 In disputes that may arise between measurng techniques, the vernier wrap tape is to act as the referee iq determining compliance with the requirements for average outside diameters. 3.12 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.

00

Table 3.1 Outside diameter and wall thickness of PVC and high-density PE conduit in inches *•

Wall thicknesses

Average

Maximum

Minimum

Maximum

Minimum

1 /2

0.840 ±0.004

0.848

0.832

0.855

0.825

a

3/4

1.050 +0.004

1.060

1.040

1.070

1.030

1

1.315 ±0.005

1.325

1.305

1.340

1-1/4

1.660 ±0.005

1.672

1.648

1- 1 /2

1.900 ±0.006

1.912

2

2.375 ±0.006

2 - 1 /2

Type A PVC conduit

High-density PE conduit

Type EB PVC conduit Maximum Minimum

High-density PE conduit

Type A PVC conduit

Type EBb PVC conduit

Minimum

Maximum

a

0.129

0.109

0.080

0.060

a

a

a

a

0.133

0.113

0.080

0.060

a

a

1.290

a

a

0.153

0.133

0.080

0.060

a

a

1.685

1.635

a

a

0.160

0.140

0.090

0.070

a

a

Ị .888

1.930

1.870

a

a

0.165

0.145

0.100

0.080

a

a

2.387.

2.363

2.410

2.340

2.405

2.345

0.174

0.154

0.120

0.100

0.094

0.060

2.875 ±0.007

2.890

2.860

2.910

2.840

a

a

0.227

0.203

0.130

0.110

a

a

3

3.500 ±0.008

3.515

3.485

3.540

3.460

3.530

3.470

0.242

0.216

0.145

0.125

0.109

0.061

3-1/2

4.000 ±0.008

4.050

3.950

4.045

3.955

4.050

3.950

0.253

0.226

0.165

0.145

0.124

0.072

4

4.500 ±0.009

4.550

4.450

4.550

4.540

4.550

4.450

0.265

0.237

0.170

0.150

0.129

0.082

5

5.563 ±0.010

5.613

5.513

5.618

5.508

5.613

5.513

0.289

0.258

a

a

0.144

0.103

6

6.625 ±0.011

6.675

6.575

6.690

6.560

6.675

6.575

0.314

0.280

a

a

0.164

0.125

a Additional requirements will be added as these sizes are determined to be acceptable.

Minimum Maximum

Minimum

UL S51A

Maximum

TYPE EB AND A RIGID PVC CONDUIT AND HDPE CONDUIT —

Outside diameters Trade size of conduit in inches

b Length - Standard lengths are 10 feet and 20 feet. Other lengths may be shipped for specific applications. AUGUST 24,

AUGUST 24, 1995

Table 3.2 Limits on outside diameters and wall thicknesses of PVC and high-density PE conduit in millimeters

Type A PVC conduit

High-density PE conduit

Wall thicknesses. Type EB PVC conduit

High-density PE conduit

Type A PVC conduit

Type EBb PVC conduit

Average

Maximum

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

Minimum

1 /2

21.34 ±0.10

21.54

21.13

21.72

20.96

a

a

3.28

2.77

2.03

1.52

a

a

3/4

26.67 ±0.10

26.92

26.42

27.18

26.16

a

a

3.38

2.87

2.03

1.52

a

a

1

33.40 ±0.13

33.66

33.15

34.04

32.77

a

a

3.89

3.38

2.03

1.52

a

a

1-1/4

42.16 ±0.13

42.47

41.86

42.80

41.53

a

a

4.06

3.56

2.29

1.78

a

a

1- 1 /2

48.26 ±0.15

48.56

47.96

4°.02

47.50

a

a

4.20

3.68

2.54

2.03

ạ

a

2

60.32 ±0.15

60.63

60.02

61.21

59.44

61.09

59.56

4.42

3.91

3.05

2.54

2.39

1.52

2 - 1 /2

73.02 ±0.18

73.41

72.64

73.91

72.14

a

5.57

5.16

3.30

2.80

a

a

3

88.90 ±0.20

89.28

88.52

89.92

87.88

89.60

88.14

6.15

5.49

3.68

3.18

2.77

1.55

3-1/2

101.60 ±0.20

102.87

100.33

102.74

100.46

102.87

100.33

6.43

5.74

4.20

3.68

3.15

1.83

4

114.30 ±0.23

115.57

113.03

115.57

113.03

115.57

113.03

6.73

6.02

4.32

3.80

3.28

2.08

5

141.30 ±0.25

142.57

140.03

142.70

139.90

142.57

140.03

7.34

6.55

a

a

3.66

2.62

6

168.28 ±0.28

169.54

167.00

169.93

166.62

169.54

167.00

7.98

7.11

a

a

4.17

3.18

a

TYPE EB AND A RIGID PVC CONDUIT AND HDPE CONDUIT — UL 651A

Outside diameters Trade size of conduit in inches

a Additional requirements will be added as these sizes are determined to be acceptable. b Length - Standard lengths are 10 feet and 20 feet. Other lengths may be shipped for specific applications.