最新完整版标准UL8750-2021（Jan5,2021）.pdf_ul8750最新中文版

版权申诉

5星 · 超过95%的资源 31 浏览量更新于2024-03-27 收藏 2.78MB PDF 举报

身份认证购VIP最低享 7 折!

领优惠券(最高得80元）

资源详情

资源推荐

UL COPYRIGHTED MATERIAL – NOT AUTHORIZED FOR FURTHER

REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INC.

12 UL 8750 JANUARY 5, 2021

Figure 3.1

Maximum voltage

UL COPYRIGHTED MATERIAL – NOT AUTHORIZED FOR FURTHER

REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INC.

JANUARY 5, 2021 UL 8750 13

3.25 RISK OF FIRE – A risk of fire exists in all electrical circuits except:

a) A Class 2 circuit,

b) An LVLE circuit, or

c) A circuit of 15 W maximum power limit under normal and single fault conditions, as measured in

accordance with 8.8.

3.26 SECONDARY OPTIC – An optically transparent or translucent structure that is mechanically

separate from the one or more LED packages it encloses. A secondary optic is generally intended to

enhance performance by directing light paths and/or through the use of phosphors that shift the optical

spectrum. In some cases, a secondary optic can serve as a fire enclosure, an electrical enclosure, an

environmental barrier, and/or a UV emissions filter.

3.27 Deleted

3.28 UNIT – A generic term meaning any discrete device, subassembly, or assembly.

3.29 UNIT, FIXED – A unit intended to be permanently connected electrically to the wiring system.

3.30 UNIT, PORTABLE – A unit that is easily carried or conveyed by hand, and is provided with a power-

supply cord for connection to the supply circuit.

3.31 UNIT, STATIONARY – A unit that is intended to be fastened in place or located in a dedicated

space, and is provided with a power-supply cord for connection to the supply circuit.

4 Power supplies, LED Drivers, and Transformers

4.1 A power supply or LED driver shall comply with the requirements of this standard. Compliance with

the requirements of one or more of the following standards shall be considered to meet the intent of any

equivalent requirements within this standard:

a) The Standard for Class 2 Power Units, UL 1310,

b) The Standard for Information Technology Equipment – Safety – Part 1: General Requirements,

UL 60950-1,

c) The Standard for Power Units Other Than Class 2, UL 1012, or

d) The Standard for Fluorescent-Lamp Ballasts, UL 935.

4.2 A transformer for use with LED units that complies with any one of the following standards is

considered to meet the intent of the requirements of this standard:

a) The Standard for Low Voltage Transformers – Part 1: General Requirements, UL 5085-1, and

the Standard for Low Voltage Transformers – Part 3: Class 2 and Class 3 Transformers, UL 5085-

b) The Standard for Transformers and Motor Transformers for Use in Audio-, Radio- and

Television-Type Appliances, UL 1411,

c) The Standard for Low Voltage Transformers – Part 2: General Purpose Transformers, UL 5085-

2, or

UL COPYRIGHTED MATERIAL – NOT AUTHORIZED FOR FURTHER

REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INC.

14 UL 8750 JANUARY 5, 2021

d) The Standard for Dry-Type General Purpose and Power Transformers, UL 1561.

4.3 A power supply, LED driver, or transformer shall be used within its rated input, output, and

environmental ratings.

CONSTRUCTION

5 Environmental Considerations

5.1 A unit intended for dry locations only shall be so identified and shall not be provided with any

information such as markings, instructions, or illustrations that implies or depicts damp or wet use.

5.2 A unit intended for damp locations shall be:

a) Subjected to the environmental tests of 8.14 unless all live parts and traces on the printed wiring

board are potted (see 6.7) or conformal coated (see 7.7.6),

b) If provided with a polymeric enclosure, comply with the Resistance to Impact test of the

Standard for Polymeric Materials – Use in Electrical Equipment Evaluations, UL 746C, using a

preconditioning temperature of 0 ±2.0°C (32 ±3.6°F), and

c) Eligible to be marked as suitable for damp locations, and not be provided with any information

such as markings, instructions, or illustrations that implies or depicts wet use.

Exception: A circuit operating at Class 2 or LVLE power levels in which voltage levels are below those that

present a risk of electric shock per 3.24 is not required to be subjected to parts (a) and (b) above.

5.3 A unit intended for use in wet locations shall:

a) Be subjected to the environmental tests of 8.14 unless all live parts and traces on the printed

wiring board are potted (see 6.7) or conformal coated (see 7.7.6),

b) If provided with a polymeric enclosure, comply with the UV Light Exposure and Cold Impact Test

of the Standard for Polymeric Materials – Use in Electrical Equipment Evaluations, UL 746C, using

a preconditioning temperature of minus 35.0 ±2.0°C (minus 31.0 ±3.6°F), and

c) Be eligible to be marked as suitable for wet locations.

Exception: A circuit operating at Class 2 or LVLE power levels in which voltage levels are below those that

present a risk of electric shock per 3.24 is not required to be subjected to parts (a) and (b) above.

6 Mechanical Construction

6.1 General

6.1.1 A unit intended to be used in an application identified by one of the standards specified in 1.3 shall

comply with the mechanical construction requirements of that standard. If an end-use application is not

specified or identified, or if a particular construction feature is not covered by the identified standard, the

unit shall comply with the mechanical construction requirements of this section.

6.1.2 Deleted

6.1.3 Circuits that represent a risk of electric shock or risk of fire shall be provided with an electrical or fire

enclosure that complies with 6.2 or 6.3.

UL COPYRIGHTED MATERIAL – NOT AUTHORIZED FOR FURTHER

REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INC.

JANUARY 5, 2021 UL 8750 15

6.1.4 An electrical or fire enclosure secured in place by adhesive shall comply with the Adhesive Support

Test of 8.13. Fusion techniques, such as solvent cementing, ultrasonic welding, electromagnetic induction,

and thermal welding are permitted without test.

6.1.5 In addition to complying with the construction requirements specified in this standard, a direct plug-

in unit shall comply with the Mechanical Assembly, Input Connections, and Accessibility of Live Parts

requirements specified in the Standard for Class 2 Power Units, UL 1310.

6.1.6 In addition to complying with the construction requirements specified in this standard, a LED

controller that is intended to be installed in a wall-box (or provided with an enclosure for flush or surface

mounting) shall comply with the following requirements in the Standard for Safety for Solid-State Dimming

Controls, UL 1472 as applicable:

a) Means for mounting,

b) Current-carrying parts,

c) Switches,

d) Flush-device cover plates, and

e) Touch dimmers.

Note: This requirement applies to LED controllers that are not covered within the scope of the Standard for Safety for Solid-State

Dimming Controls, UL 1472. See 1.1.3(b).

6.2 Metal parts

6.2.1 The thickness of a metal enclosure shall be in accordance with Table 6.1.

Exception: A part of an enclosure that complies with the mechanical strength tests for metal enclosures of

8.15 need not comply with the thickness specified in Table 6.1.

Table 6.1

Minimum thickness of metal enclosures

Metal

At small, flat, unreinforced

surfaces and at surfaces of a

shape or size to provide adequate

mechanical strength

At surfaces to which a

wiring system is to be

connected in the field

At relatively large

unreinforced flat

surfaces

(in)

Die-cast 1.2 (3/64) – – 2.0 (5/64)

Cast malleable iron 1.6 (1/16) – – 2.4 (3/32)

Other cast metal 2.4 (3/32) – – 3.2 (1/8)

Uncoated sheet steel 0.66 (0.026) 0.81 (0.032) 0.66 (0.026)

Galvanized sheet steel 0.74 (0.029) 0.86 (0.034) 0.74 (0.029)

Nonferrous sheet metal other

than copper

0.91 (0.036) 1.14 (0.045) 0.91 (0.036)

6.2.2 All ferrous metal parts, including hinges, bolts, and fasteners, exposed after assembly shall be

protected against corrosion by painting, coating, or plating, except for edges, punched holes, and spot

welds in prefinished steel, enclosed steel pipe, and hanger locations for painting or plating. Copper,

aluminum, alloys of copper and aluminum, stainless steel, and similar materials having inherent resistance

to atmospheric corrosion are not required to have additional corrosion protection.

UL COPYRIGHTED MATERIAL – NOT AUTHORIZED FOR FURTHER

REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INC.

16 UL 8750 JANUARY 5, 2021

6.2.3 A protective coating need not be applied to steel enclosure parts when:

a) The interior of an enclosure is completely filled with potting compound,

b) Flat metal surfaces are tightly clamped together, or

c) Where not practical due to bearings, sliding surfaces of a hinge or shaft, hinge pins, and similar

parts.

6.3 Polymeric materials

6.3.1 A polymeric material for which mechanical, electrical, or thermal characteristics are relied upon for

compliance with the requirements of this standard shall have an electrical, mechanical with impact and

mechanical with strength relative thermal index (RTI), or a generic thermal index as specified in the

Standard for Polymeric Materials – Long Term Property Evaluations, UL 746B, that is equal to or greater

than the temperature measured during the Temperature Test, Section 8.3.

6.3.2 A polymeric material used as an electrical or fire enclosure shall comply with the minimum material

characteristic requirements identified in Table 6.2.

Table 6.2

Polymeric enclosure requirements

Performance characteristic

Function

Electrical enclosure Fire enclosure

Impact

X X

UV Resistance

X X

Flammability X

d,e,f

Mold Stress X X

Comparative Tracking Index (CTI) Performance Level Category (PLC) of 4

Hot Wire Ignition (HWI) PLC of 3

High Ampere Arc (HAI) PLC of 2

These characteristics are as specified in the Standard for Polymeric Materials – Use in Electrical Equipment Evaluations, UL

746C. Polymeric parts with deficient minimum performance characteristics can be evaluated per applicable end-product

requirements in UL 746C.

6.8 J (5 ft-lb) ball impact for dry or damp location, fixed or stationary units; 0.91 m (3 ft) drop impact for portable units. For damp

or wet location, fixed units, the impact test is to be conducted after cold conditioning in accordance with UL 746C.

For wet location units.

V2 for portable units and track lighting luminaires.

5VA for fixed or stationary units. See 6.3.4 and 6.3.6 for additional options for secondary optics.

Direct plug-in units are evaluated as portable units. A through cord unit with screw holes or other means for fastening in-place is

considered a stationary unit. A through cord unit with keyholes only is considered a portable unit.

Not required when all live parts are > 0.8 mm (0.030 in) from the material.

6.3.3 A conductive coating applied to a surface such as the inside surface of a cover, enclosure, and the

like shall comply with the appropriate requirements for metallized parts in the Standard for Polymeric

Materials – Use in Electrical Equipment Evaluations, UL 746C, unless it can be determined that flaking or

peeling of the coating does not result in a reduction of spacing of electrical parts or the bridging of live

parts that may result in a risk of fire or electric shock.

6.3.4 With respect to footnote (e) of Table 6.2, if a fire barrier consisting of metal or of a polymeric

material having a minimum flammability rating of 5VA is positioned between a circuit that represents a risk

of fire and the secondary optic, the secondary optic need only be evaluated as an electrical enclosure per

剩余126页未读，继续阅读

std7879

粉丝: 105
资源: 2000

会员权益专享

"UL 8750-2021最新标准全文解读：LED照明产品使用设备标准详解"。

会员权益专享

最新资源

"UL 8750-2021最新标准全文解读：LED照明产品使用设备标准详解"。

UL 8750-2021（Jan 5, 2021）.pdf

ul8750中文译本

ul 8750 标准

最新完整版标准 UL 82-2021-05-13.pdf

最新完整版标准 UL 2703-2021-03-24.pdf

最新完整版标准 UL 1993-2021-3-26.pdf

广义乘子变换相关的p叶函数新广义积分算子研究-JEMS-2014-EG-B.V.

《局部序空间中双映射及双同伦的并发建模》-斯特凡·索科洛夫斯基-2002-Vol.52 No.2

ul2054-2021

ul 2580-2021

ul 2556-2021

ul 458-2021中文版

ul 94-2023.pdf

Elements in iteration expect to have 'v-bind:key' directives.eslint-plugin-vue

ul61800-5-1对应国标

ul62368-1落球标准下载

ul 60950-1 下载

会员权益专享

最新资源