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1、FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Subject 1838 November 11, 2005 SUMMARY OF TOPICS The following changes in requirements are being proposed: 1. Revision for power unit secondary connections to require that fi eld-connected terminal blocks be suitable for fi eld wiring use
2、 and to address temperature limits. 2. Revision of installation instruction statements about distance from pools, spas, and fountains including (a) editorial correction to metric value, (b) installation distance statements addressing both circuits protected by GFCI and circuits not protected by GFCI
3、 and be specifi c to supply connection method, and (c) power unit installation distance statement specifying fountain as well as pool and spa. 3. Revision to the marking form type for the shipping container marking. 4. Addition of voltage limits for DC and non-sinusoidal AC output circuits for low v
4、oltage lighting systems. 5. Correction of text in 50.18 to refl ect the wording originally proposed in the UL bulletin dated October 15, 2001 and accepted by STP 1838. 6. New requirements for luminaires for ponds and small decorative fountains. 7. Revisions to add and clarify defi nitions and termin
5、ology used in this standard. 8. Revisions to address applicability of PART 1 requirements to Class 2 circuit components. 9. Clarifi cation that the protective device limiting the output to 25A is not required to be an overcurrent device; and how it is established that the output is so limited. 10. R
6、eorganizing power supply cord length requirements. 11. Revisions to require a fl ood lamp in luminaire heat tests. 12. Revision to clarify the luminaire supply voltage for the Abnormal Operation Tests. 13. Revision to clarify which luminaires are not required to be subjected to the Severe Conditions
7、 Test. 14. Reorganize Section 22, Separation of Circuits. 15. Reorganize and Rename Section 24, Power Supply Connections. 16. Miscellaneous Corrections and Clarifi cations. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/56188011
8、00 Not for Resale, 10/20/2006 02:46:39 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION For your convenience in review, proposed additions to existing requirements are shown underlined and proposed deletions are s
9、hown lined-out. 1. Revision for power unit secondary connections to require that fi eld-connected terminal blocks be suitable for fi eld wiring use and to address temperature limits. RATIONALE UL has received reports of fi eld incidents where improper connections of the main output circuit wiring at
10、 a terminal block on the power supply have led to melting of plastic insulating materials, increasing the risk of fi re. Currently, UL 1838 subsection 24.5 for output circuit connections of the power supply does not require that fi eld-connected terminal blocks be suitable for fi eld wiring use. It
11、also does not clearly require the temperatures encountered at the termination points, the type of conductors to be connected, and the number of conductors to be connected all be addressed. UL proposes to revise 24.5.1 and renumber it as 24.4.4 and add new 24.4.5, 24.4.6, 24.4.7 and 50.22 to address
12、these issues. Paragraph numbering is consistent with the proposed new Section numbering provided in its entirety in Topic 15 of this bulletin. PROPOSAL Note: Please see bulletin Topic 15 for paragraphs 24.4.4 - 24.4.7 50.22 In accordance with 24.4.7, visible at the point of secondary wire connection
13、s, a marking shall be provided in 1/8 inch (3.2 mm) high lettering, Read Installation Instructions before Wiring or equivalent. 2. Revision of installation instruction statements about distance from pools, spas, and fountains including (a) editorial correction to metric value, (b) installation dista
14、nce statements addressing both circuits protected by GFCI and circuits not protected by GFCI and be specifi c to supply connection method, and (c) power unit installation distance statement specifying fountain as well as pool and spa. RATIONALE (a) Editorial Correction To Metric Value UL proposes to
15、 correct the metric equivalent for 10 feet in paragraph 57.3 from 1.52 m to be 3.05 m. (b) Installation Distance Statements Need To Address Both Circuits Protected By GFCI And Circuits Not Protected By GFCI And Be Specifi c To Supply Connection Method UL believes the present wording of 51.1 and its
16、exception may leave the reader of this UL 1838 requirement concluding the installation instructions for the power unit may need to specify only the information of items (a) or (b) below, but not the information of both items (a) and (b). a) the power unit is not to be used within 10 feet of a pool o
17、r spa; or b) the power unit is not to be used within 5 feet of a pool or spa when the power unit is connected to a branch circuit protected by a GFCI. NOVEMBER 11, 2005SUBJECT 1838-2- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State Universi
18、ty/5618801100 Not for Resale, 10/20/2006 02:46:39 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION UL believes it is important to communicate both instructions to the installer since the installer may encounter ei
19、ther a branch circuit protected by a GFCI or a branch circuit that is not protected by a GFCI. Further, UL believes the wording of the instructions needs to refer to the means used to connect the power unit to the branch circuit either conduit connected or power supply cord-connected. This is becaus
20、e other aspects of the instruction wording need to differ depending on whether a power supply cord-connected power unit is located indoors or outdoors. In general, all outdoor receptacles (and receptacle-connected equipment) of dwellings and in public spaces of non-dwellings are required to be GFCI
21、protected, regardless of their distance from the body of water. This is consistent with 210.8(A)(3) and 210.8(B)(4) of the 2005 NEC. Where indoors, newly installed luminaires and power units are required to be protected by a GFCI only when located within 10 feet of a pool or spa. This is consistent
22、with 680.22(B)(4) of the NEC. Therefore, UL proposes the elimination of the exception to 51.1 and the revision of 51.1 and the addition of 51.1.1 and 51.1.2 to require statements to address these various situations. (c) Power Unit Installation Distance Statement Specifying Fountain As Well As Pool A
23、nd Spa 51.1 requires the power unit installation instructions to include a statement about installing the power unit a certain distance from a pool or spa. 57.3 requires the luminaire installation instructions to include a statement about installing the luminaires a certain distance from a pool, spa
24、, or fountain. The two instructions are inconsistent in that distance from a fountain is involved for the luminaires but is not involved for the power units. UL believes the installation instruction statement for power units should specify fountains, as well as pool and spa. This is consistent with
25、section 411.4 of the NEC which requires lighting systems to not be installed within 3.0 m (10 ft) of pools, spas, fountains, or similar locations, except as permitted by Article 680. Therefore UL proposes the addition of the term fountain into the requirement of 51.1. This is refl ected in the propo
26、sals for revised 51.1 and new 51.1.1. PROPOSAL 51.1 Installation instructions shall be provided with the power unit that include specifi c instructions for mounting, proper wiring, grounding, and servicing. The instructions shall inform the installer that the main secondary wiring is intended for sh
27、allow burial less than 6 inches (152 mm) unless the manufacturer has provided wiring intended for direct burial. The instructions shall include a statement that the power unit is not to be used within 10 feet (3.05 m) of a pool or spa. Installation instructions shall be provided with the power unit.
28、 Specifi c instructions for mounting, proper wiring, grounding, and servicing shall be included. The instructions shall inform the installer that the main secondary wiring is intended for shallow burial less than 6 inches (152 mm) unless the manufacturer has provided wiring intended for direct buria
29、l. Exception:When the power unit is connected to a GFCI protected branch circuit, the power unit has the option of being mounted no less than 5 feet (1.52 m) from a pool or spa. NOVEMBER 11, 2005SUBJECT 1838-3- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=No
30、rth Carolina State University/5618801100 Not for Resale, 10/20/2006 02:46:39 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 51.1.1 The instructions for a conduit-connected power unit shall include the statements
31、 WARNING Risk of Electric Shock. Install power unit 5 feet (1.5 m) or more from a pool or spa and 10 feet (3.05 m) or more from a fountain. Where the power unit is installed within 10 feet (3.05 m) of a pool or spa connect power unit to a GFCI protected branch circuit. 51.1.2 The instructions for a
32、power-supply cord connected power unit shall include the statements WARNING Risk of Electric Shock. Install power unit 5 feet (1.5 m) or more from a pool, spa, or fountain. Where the power unit is installed (a) indoors within 10 feet (3.0 m) of a pool, spa, or fountain or (b) outdoors, connect power
33、 unit to a receptacle protected by a GFCI.” 57.3 The instructions shall include a statement that the luminaires shall not be installed within 10 feet (1.52 m) of a pool, spa, or fountain. The instructions for other than a pond and small decorative fountain luminaire shall include the statements WARN
34、ING Risk of Electric Shock. Install all luminaires 10 feet (3.05 m) or more from a pool, spa, or fountain. Exception:When the power unit is connected to a GFCI protected branch circuit, the power unit has the option of being mounted no less than 5 feet (1.52 m) from a pool or spa. 3. Revision to the
35、 marking form type for the shipping container marking. RATIONALE UL proposes to revise paragraph 56.6 to refl ect that the marking be in Form A-3 instead of D-3 since the marking methods associated with form type A are more appropriate. PROPOSAL 56.6 The shipping container shall indicate that the lu
36、minaire or fi tting is only for use with low voltage landscape lighting power units with a maximum output rating of _ volts, 300 watts per secondary, unless evaluated for other uses. The voltage shall not exceed the voltage of the system or 15 volts. The marking shall be in Form D-3 A-3. 4. Addition
37、 of voltage limits for DC and non-sinusoidal AC output circuits for low voltage lighting systems. RATIONALE UL proposes the following sets of changes in the requirements of UL 1838, all related to the maximum output circuit voltage. Presently, UL 1838 specifi es maximum output voltage in 1.1, 6.1, a
38、nd 28.2.1 as 15 V ac (21.2 V peak) open circuit voltage. UL has encountered power units that produce dc output circuit voltage with ac ripple voltage. To provide for users of UL 1838 being able to determine the voltage limits for such waveforms, UL proposes the correlating voltage limits shown in th
39、e third and fi fth items in proposed Table 2A.1 and in proposed Figure 2A.1 be added to UL 1838. These voltage limits exhibit a risk of electric shock equivalent to the acceptably low risk of the 15 V AC RMS sinusoidal and 21.2 V AC peak non-sinusoidal limits for those voltage waveforms (the fi rst
40、and second items in Table 2A.1). Similarly, UL proposes the addition of the 12.4 V, peak limit (fourth item in Table 2A.1) for dc interrupted at a rate of 10 to 200 Hertz since this waveform, too, might be encountered. For example, it might be encountered with output circuits supplying LED-based lum
41、inaire systems where the interrupted DC current serves both to provide power to the LEDs and to affect color or intensity characteristics of the total light emitted by the luminaire. Also, UL has encountered LED and non-LED luminaire designs NOVEMBER 11, 2005SUBJECT 1838-4- Copyright Underwriters La
42、boratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/20/2006 02:46:39 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION in other categories whe
43、re interrupted DC current conducts in a separate control circuit conductor as part of the cable extending to the luminaire(s) and anticipates this design is or may occur in landscape lighting systems. UL proposes that UL 1838 address interrupted DC circuits for those users of the Standard that need
44、this requirement information. The 12.4 V peak limit proposed for interrupted DC voltage is also neither more or less stringent to the presently accepted 15 V rms ac limit. The specifi c electric shock injury experienced by a person is a function of the electric current that conducts through the pers
45、on. This in turn is a function of other parameters including the voltage across the person and the impedance exhibited by the person in the electric shock scenario. Another signifi cant parameter is the waveform of electric current (sinusoidal, dc, dc + ac, interrupted dc, non-sinusoidal ac). Presen
46、t 2.16 identifi es the risk of electric shock as 5 milliamperes. The relative risk of electric shock presented by electric current varies with the electric current waveform involved. UL proposes to delete the defi nition of risk of electric shock in 2.16 and, instead, refer the reader to proposed ne
47、w Section 2A. New Section 2A associates the appropriate maximum voltage and maximum current with the electric current/voltage waveform involved. For example, the maximum permitted electric current is 30 mA (rather than 5 mA as specifi ed in existing 2.16) for dc with ripple of not more than 0.17 per
48、cent of the dc current. Existing 2.16 specifi es the use of a 1500 ohm resistor to represent a persons body in the electric shock scenario. A 1500 ohm resistance represents a persons body only in a dry contact situation. Since landscape lighting products are very often used outdoors where they are s
49、ubject to water from precipitation, sprinklers, condensation, and other sources, UL believes the more conservative wet- contact body impedance model of 500 ohm should be used. Therefore, UL proposes this body impedance model resistance value change as part of new 2A.1. Where leakage current to ground originates from the 120 volt ac circuit in a power unit, the impedance neede