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1、Subject 6A 1655 Scott Blvd. Santa Clara, CA 95050 August 1, 2003 TO: SUBJECT: Standards Technical Panel (STP) for Metallic Tubing and Conduit, STP 6 Subscribers to ULs Standards Service for Electrical Council of Underwriters Laboratories Inc. Other Interested Parties Electrical Rigid Metal Conduit -
2、 Aluminum and Stainless Steel Request for Comments on Proposed Requirements for the First Edition of the Standard for Electrical Rigid Metal Conduit - Aluminum and Stainless Steel, UL 6A; PROPOSED EFFECTIVE DATE INSTRUCTIONS STP Members: If you are a voting member of the STP, complete the attached b
3、allot(s) with your vote on the standard or proposals. Please note that all negative ballots must be accompanied by supporting written reasons and, where possible, proposals for a solution to the problem raised. Impact statements and effective date(s) information are not subject to letter ballot. The
4、refore, comments regarding impact statements and effective dates may be made and should be sent to the STP Secretary separate from the letter ballot. Subscribers and other interested parties: If you are a subscriber or other interested party, you are requested to send comments on the proposed requir
5、ements, impact statements, and proposed effective date to the STP Secretary. The STP member ballot should not be used to submit your comments. Comments should be made in writing and may be sent by fax, E-mail, or regular mail to Paul Lloret at ULs Santa Clara office. Please reference all corresponde
6、nce to Subject 6A. Note all comments received are public and may be circulated to others. If you respond by fax or E-mail, please include your full name and company name and address to ensure a reply. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwe
7、stern Div./7838506130, User=abc, abcdd Not for Resale, 09/09/2006 23:18:28 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 6A -2- AUGUST 1, 2003 SUMMARY OF TOPICS This bulletin proposes the addition of requirements for red brass conduit, fittings, and elbows. STP BA
8、LLOTS AND ALL COMMENTS DUE: SEPTEMBER 15,2003 Attached as Appendix A for your review and comment are proposed requirements for UL 6A. Attached as Appendix B for your review and comment are the impact statement and proposed effective date(s). Attached as Appendices C, D, and E are the STP membership
9、roster, STP ballot instructions, and ballot, respectively. Questions regarding interpretation of requirements should be directed to the responsible UL staff. Please see Appendix F of this bulletin regarding designated responsibility for the subject product categories. Please note that proposed requi
10、rements are of a tentative and early nature and are for review and comment only. Current requirements are to be used to judge a product until these requirements are published in final form. PRODUCTSANDINDUSTRIESAFFECTED BYTHE PROPOSAL UL requests your assistance in identifying other products or indu
11、stries that might be affected by the requirements contained in this bulletin. UL suggests that all suppliers or customers for these products and industries be made aware of these requirements prior to their proposed effective date. Also, please forward your suggestions to UL so that these products a
12、nd industries may be identified in future bu I let ins. Unless specifically requested to do so, UL will not acknowledge comments indicating concurrence with these proposals. RATIONALE Industry has requested that UL incorporate requirements for red brass conduit into UL 6A. In some areas, brass condu
13、it is preferred for use in swimming pool and fountain applications since it offers preferential installation procedures (including, but not limited to, more shallow cover requirements and installation in concrete). Additionally, the use of red brass conduit for these applications eliminates the need
14、 for a No.8 AWG bonding wire for PVC and effectively addresses the adherence of potting compounds over the connection between the wire and the wet niche fixture. Since galvanic action from dissimilar materials is not an issue in these applications, UL is proposing the addition of red brass conduit r
15、equirements to UL 6A. The title of the standard will also be revised to ”Electrical Rigid Metal Conduit - Aluminum, Red Brass, and Stainless Steel.” On Junel7, 2003, UL proposed the deletion of bronze requirements from UL 6A. While this proposal bulletin is a separate issue, it should be referenced
16、for continuity. In tables where bronze requirements were proposed for deletion, requirements for red brass requirements are now proposed for inclusion. Also, where references to bronze were previously located and proposed for deletion, proposals for red brass requirements have been inserted. Copyrig
17、ht Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130, User=abc, abcdd Not for Resale, 09/09/2006 23:18:28 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 6A -3- AUGUST 1, 2003 UNDERWRITERS LABORATORIES INC
18、. PAUL LLORET Senior Engineering Associate Secretary for STP 6 Standards Department Santa Clara Office Phone: (408) 876-2410 Fax: (408) 556-6151 E-mail: http:/ Copyright O 2003 Underwriters Laboratories Inc. SR:MK bul-6A. 120030801 REVIEWED BY: GEORGE FECHTMANN (Ext. 22858) Chair for STP 6 Conformi
19、ty Assessment Services 301 6HMEL Melville Office Phone: (631) 271-6200 Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130, User=abc, abcdd Not for Resale, 09/09/2006 23:18:28 MDTNo reproduction or networking permitted without lice
20、nse from IHS -,-,- SUBJECT 6A -Al- AUGUST l , 2003 APPENDIX A PROPOSED REQUIREMENTS FOR THE FIRST EDITION OF THE STANDARD FOR ELECTRICAL RIGID METAL CONDUIT -ALUMINUM AND STAINLESS STEEL, UL 6A For your convenience in review, proposed additions to existing requirements are shown underlined and propo
21、sed deletions are shown tmd-e a red brass allov C23000 as detailed in the SDecification for Seamless Red Brass PiDe. Standard Sizes. ASTM B 43; or stainless steel. 5.1 Rigid metal conduit made of aluminum, red brass. or stainless steel, does not require a protective coating. Exception: Aluminum cond
22、uit intended for use in concrete, for direct burial, or for use in severely corrosive environments, shall be provided with a protective coating. (CURRENT) Table 7.1 Length and weight of finished conduita Trade Size 3/8 1 /2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 3-1/2 4 (Metric desig.) 12 16 21 27 35 41 53 63
23、78 91 103 Length of finished conduit without a coupling attached, Ft and in If114 in) Imm f6 mm) 9 11-1/2 9 11-1/4 9 11-1/4 9 11 9 11 9 11 9 11 9 IO-1/2 9 IO-1/2 9 IO-1/4 9 IO-1/4 3035 3030 3030 3025 3025 3025 3025 301 O 301 O 3005 3005 Minimum weight of ten lengths of finished conduit with one coud
24、ina attached to each lenath Stainless steel, Ibb 51.6 79.5 105.6 152.7 201.8 250.0 3335 529.3 685.6 834.6 9764 (kg)= 23.46 36.12 47.98 69.86 91.75 113.63 151.59 240.57 31 1.62 379.37 443.83 Aluminum, Ibd 17.8 27.4 36.4 53.0 69.6 86.2 115.0 182.5 236.4 287.8 336.7 (kgle 8.08 12.40 16.48 24.01 31.54 3
25、9.08 52.10 82.70 107.12 130.41 152.58 Table 7.1 Continued on Next Page Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130, User=abc, abcdd Not for Resale, 09/09/2006 23:18:28 MDTNo reproduction or networking permitted without lice
26、nse from IHS -,-,- SUBJECT 6A Aluminum, -A2- Red Brass, AUGUST 1, 2003 Table 7.1 Continued (Metric Trade Size desig.) 155 Length of finished conduit without a coupling attached, Ft and in (f114 in) (mm f6 mm) Minimum weight of ten lengths of finished conduit with one coupling attached to each length
27、 Stainless steel, Aluminum, (kgr (kgle 1319.2 599.64 454.9 206.14 1752.8 796.71 604.4 273.89 i The lengths indicated are designed to produce a ten foot (3.05 m) length of conduit when a standard coupling is attached ) The weight shown is for a stainless steel alloy (Type 304 or 316) with a density o
28、f 0.284 pound mass per cubic inch. For a jtainless steel alloy of a different density, the minimum weight is to be determined by multiplying the weight shown by the ratio If the density of the alloy used in pound mass per cubic inch to 0.284. The weight shown is for a stainless steel alloy (Type 304
29、 or 316) with a density of 7861 kg/m3. For a stainless steel alloy of a Merent density, the minimum weight is to be determined by multiplying the weight shown by the ratio of the density of the alloy ised in kg/m3 to 7861. I The weight shown is for an aluminum alloy with a density of 0.098 pound mas
30、s per cubic inch. For an aluminum alloy of a Merent density, the minimum weight is to be determined by multiplying the weight shown by the ratio of the density of the alloy ised in pound mass per cubic inch to 0.098. ! The weight shown is for an aluminum alloy with a density of 2710 kg/m3. For an al
31、uminum alloy of a different density, the ninimum weight is to be determined by multiplying the weight shown by the ratio of the density of the alloy used in kg/m3 to !710. (PROPOSED) Table 7.1 Length and weight of finished conduita rrade Size 3/8 1 /2 3/4 1 1-1/4 1-1/2 2 2-1/2 3 3-1/2 4 5 6 (Metric
32、desig.) 12 16 21 27 35 41 53 63 78 91 103 129 155 Length of finished conduit without a coupling attached, Ft and in (mm f6 (f1/4 in) mm) I 9 11-1/2 9 11-1/4 9 11-1/4 9 11 9 11 9 11 9 11 9 IO-1/2 9 IO-1/2 9 IO-1/4 9 IO-1/4 9 10 3035 3030 3030 3025 3025 3025 3025 301 O 301 O 3005 3005 2995 9 10 I 2995
33、 Minimum weight of ten lengths of finished conduit with one coupling Stainless steel, Ibb 51.6 79.5 105.6 152.7 201.8 250.0 3335 529.3 685.6 834.6 9764 1319.2 1752.8 (kgr 23.46 36.12 47.98 69.86 91.75 113.63 151.59 240.57 31 1.62 379.37 443.83 599.64 796.71 Ibd 17.8 27.4 36.4 53.0 69.6 86.2 115.0 18
34、2.5 236.4 287.8 336.7 454.9 604.4 (kgle 8.08 12.40 16.48 24.01 31.54 39.08 52.10 82.70 107.12 130.41 152.58 206.14 273.89 Ibf (ks)g h h 86.1 39.05 h h h h h h h h h h h h h h h h h h h h h h i The lengths indicated are designed to produce a ten foot (3.05 m) length of conduit when a standard couplin
35、g is attached ) The weight shown is for a stainless steel alloy (Type 304 or 316) with a density of 0.284 pound mass per cubic inch. For a jtainless steel alloy of a different density, the minimum weight is to be determined by multiplying the weight shown by the ratio If the density of the alloy use
36、d in pound mass per cubic inch to 0.284. Table 7.1 Continued on Next Page Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130, User=abc, abcdd Not for Resale, 09/09/2006 23:18:28 MDTNo reproduction or networking permitted without l
37、icense from IHS -,-,- SUBJECT 6A Trade Size -A3- Minimum weight of ten lengths of finished conduit with one coupling attached to each length Length of finished conduit without a coupling attached, Stainless steel, Aluminum, Red Brass, (Metric Ft and in (mm f6 desig.) (f1/4 in) mm) Ibb (kg)= Ibd (kgl
38、e Ibf (ks)g AUGUST 1, 2003 Stainless Steel, Table 7.1 Continued Aluminum, (mm) 17.15 21.34 26.67 33.40 42.16 48.26 60.33 73.03 88.90 101.60 114.30 141.30 168.28 (CURRENT) inch 0.493 0.632 0.836 1.063 1.394 1.624 2.083 2.489 3.090 3.570 4.050 5.073 6.093 Table 7.2 Dimensions of conduit (For informati
39、on only) inch (mm) 00.091 2.31 0.104 2.64 0.107 2.72 0.126 3.20 0.133 3.38 0.138 3.51 0.146 3.71 0.193 4.90 0.205 5.21 0.215 5.46 0.225 5.72 0.245 6.22 0.266 6.76 Trade (Metric size desig.) 318 12 112 16 314 21 1 27 1-114 35 1-112 41 2 53 2-112 63 3 78 3-112 91 4 103 5 1295 6 155 inch 0.091 0.104 0.
40、107 0.126 0.133 0.138 0.146 0.193 0.205 0.215 0.225 0.245 0.266 Inside c inch 0.675 0.840 1 .O50 1.315 1,660 1.900 2.375 2.875 3.500 4.000 4.500 5.563 6.625 (mm) 12.522 16.05 21.23 27.00 35.41 41.25 52.91 63.22 78.49 90.68 102.87 128.85 154.76 imeter, Aluminum, inch 0.493 0.632 0.836 1 .O63 1.394 1,
41、624 2.083 2.489 3.090 3.570 4.050 5.073 6.093 (mm) 12.52 16.05 2123 27.00 35.41 41.25 52.91 63.22 78.49 90.68 102.87 128.85 154.76 (mm) 2.31 2.64 2.72 3.20 3.38 3.51 3.71 4.90 5.21 5.46 5.72 6.22 6.76 Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwe
42、stern Div./7838506130, User=abc, abcdd Not for Resale, 09/09/2006 23:18:28 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 6A (PROPOSED) Stainless Steel, inch Imm) -A4- Aluminum, inch Imm) AUGUST 1, 2003 0.493 0.632 0.836 1.063 1.394 1.624 2.083 2.489 3.090 3.570 4.
43、050 5.073 6.093 Trade (Metric size desig.) 318 12 112 16 314 21 1 27 1-114 35 1-112 41 2 53 2-112 63 3 78 3-112 91 4 103 5 1295 6 155 12.522 0.493 16.05 0.632 21.23 0.836 27.00 1.063 35.41 1.394 41.25 1,624 52.91 2.083 63.22 2.489 78.49 3.090 90.68 3.570 102.87 4.050 128.85 5.073 154.76 6.093 Outsid
44、e diameter, 0.067 0.078 0.125 0.165 0.203 0.270 0.432 0.563 0.667 0.789 1 .O64 1.415 inch 0.675 0.840 1 .O50 1.315 1,660 1.900 2.375 2.875 3.500 4.000 4.500 5.563 6.625 - - 0.1163 0.1540 0.2239 0.2938 0.3619 0.4820 0.7705 1.0051 1.1878 1.4082 1.9647 2.5265 (mm) - 17.15 21.34 26.67 33.40 42.16 48.26
45、60.33 73.03 88.90 101.60 114.30 141.30 168.28 0.023 0.030 0.057 0.057 0.070 0.093 0.149 0.194 0.230 0.367 0.367 0.488 Table 7.2 Dimensions of conduit (For information only) 0.0401 0.0531 0.1013 0.1013 0.1248 0.1662 0.2657 0.3466 0.4096 0.6430 0.6430 0.8712 Inside diametei . 12.52 16.05 2123 27.00 35
46、.41 41.25 52.91 63.22 78.49 90.68 102.87 128.85 154.76 Red brass, inch 0.503 0.636 0.834 1 .O75 1.382 1.614 2.077 2.519 3.084 3.548 4.026 - - - - (mm) - 12.78 16.15 21.18 27.31 35.10 41 .O0 52.76 63.98 78.33 0.215 02.26 - - Wall thickness Stainless Steel, Aluminum, Red brass, inch Imm) 8.1 A nipple
47、shall be made from straight tubing of the same grade as the conduit; shall be treated, coated, threaded, etc. according to the applicable requirements for conduit and shall not exceed 2 feet (610 mm) in length. Exception: Nipples of the 3/4 (21) trade size in a red brass allov and the 1/2 (16) trade
48、 size shall not exceed 6 feet (1.83 m) in length. (CURRENT) Table 8.1 Weights of nipple (W,) Trade size 112 314 1 1-114 1-112 2 2-112 3 3-112 4 5 (Metric designator) 16 21 27 35 41 53 63 78 91 103 129 155 Table 8.1 Continued on Next Page Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=Army Northwestern Div./7838506130, User=abc, abcdd Not for Resale, 09/09/2006 23:18:28 MDTNo reproduction or networking permitted without license from IHS -,-,- SUBJECT 6A Trade size -A5- Weight W3 per unit length of ni