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Safety on
         Rangehood based on UL 507
         By
          May, 2009




All rights reserved. No portion of this m...
工程师
Please make sure your cell
pone in mute mode, thanks.
Objective
To Be In Awareness of


Intention of Safety Regulation
                          (10 min.)




Construction Revi...
“You have to learn the
rules of the game. And
then you have to
play better than
anyone else.”
Intention of
Safety Regulation
Safety Regulation
TO   assure safe and healthful
working and living conditions for
people to prevent loss of life and
property damage.
Why not protect the safety of
life and property?
Because…
pre·vent
Verb, Archaic


To anticipate or counter in
advance.
Now you know
           the
         subtle
       difference


prevent vs.protect
Safety Regulation
Just
To prescribe
standards to
establish
benchmarks for
all industries
You will see…
So…
To assure safe and healthful working conditions
for working men and women; by authorizing
enforcement of the standards dev...
The OSH Act 1970
Occupational Safety and Health Act of 1970




                                             December 29, ...
Legislation need be
embodied into
regulations such as
29 CFR.
29 CFR   (Code of Federal Regulations)
Industries work out
the nitty-gritty
requirements which
constitute of
various standards.
Nationally
Recognized Testing
Laboratory (NRTL)
OSHA need authorize and
monitor private sector
organizations, so NRTL program
came into existence.
In the evaluation of the NRTLs,
OSHA will use either
consensus-based standards
currently in use nationally, or
other stand...
The NRTL determines that
specific equipment and materials
(quot;productsquot;) meet consensus-
based standards of safety t...
NRTLs are third-party organizations recognized
by OSHA as having the capability to provide product
safety testing and cert...
Many product “approval” requirements are
found in OSHA’s standards (29 CFR Parts
1910, 1915, 1918, and 1926). Approval, i....
Regulations can only assure relative
       safety, not absolute!
I
    n d
   u s t
  r y R e
                                    Safety
 a l i t y




Standards are the compromise betwee...
Testing are simulation of reality,
         not reality!
Construction Review
Hazards
Hazards


          Electric Shock



          Mechanical Hazard



          Fire Hazard
Duct
Mounting Means



Power Supply Cord   Tempered Glass

  Ⅳ
                    Ⅰ Enclosure


Impeller Ⅲ
(blower wheel)...
Ⅰ
Your skin is your first protection
from the world,
for appliance, so is Enclosure!
2.3.3 ENCLOSURE - That part of the product that:
      a) Renders inaccessible all or any parts of the fan
      that pres...
Fire




Fire
2.3.3 ENCLOSURE - That part of the product that:
      a) Renders inaccessible all or any parts of the fan
      that pres...
Enclosure Material:
  Metal
               Gavanized sheet steel, 0.74 mm
                Uncoated sheet steel, 0.66 mm
  ...
6.3 Non-metallic enclosures


6.3.1 A non-metallic enclosure shall comply with the
applicable     mechanical     and    el...
UL 746C:
Mechanical requirement:
Ball Impact Test
[polymeric enclosure]




                          This ball?
Mechanical requirement:
Static Load Test For Mounting Means
[complete unit]
Mechanical requirement:
Mold Stress Relief Test
[polymeric parts]


BECAUSE
Internal Stress results from molding or fabric...
2.3.3 ENCLOSURE - That part of the product that:
      a) Renders inaccessible all or any parts of the fan
      that pres...
8 Accessibility of Moving Parts :
9 Accessibility of Live Parts :
Duct
Mounting Means



Power Supply Cord   Tempered Glass


                       Enclosure



Impeller
(blower wheel)


...
Ⅱ
             Entirely of metal




    Filter

             Activated carbon contained
             [R/C as Class 1 or 2...
A REUSEABLE METAL

Filter     can act as safeguard
against mechanical hazard such
as rotating impeller
Duct
Mounting Means



Power Supply Cord   Tempered Glass


                       Enclosure



Impeller Ⅲ
(blower wheel)
...
Ⅲ
               Metal




    Impeller

               Polymeric material
Polymeric Impeller
Material parameters:
      HDT [Heat Deflection Temperature]
      75 ℃ @ 455.07 kPa




      RTI 60 ℃
Polymeric Impeller
Material parameters:
      HDT [Heat Deflection Temperature]
      75 ℃ @ 455.07 kPa
UL 746C:
Duct
Mounting Means



Power Supply Cord   Tempered Glass

  Ⅳ
                       Enclosure



Impeller
(blower wheel)...
Ⅳ                 Power supply cord




    POWER SUPPY


                  Field wiring
Power supply cord:

91.6.4 For cord-connected rangehoods, the cord type
shall be one of the following: HS, HSO, HSJ, HSJO,...
Power supply cord:

91.6.5 The length of a rangehood cord shall not be
less than 3 ft (0.9 m) and shall not be more than 4...
Power supply cord:

91.6.8 The attachment plug of a power supply cord for
a cord-connected rangehood shall be of the
groun...
Power supply cord:

91.6.11 A flexible power supply cord for a cord-
connected rangehood shall vertically exit the top-
mo...
Field wiring:
Article 300 – Wiring Method
300.15 Boxes, Conduit Bodies, or Fittings —
Where Required
152.4 mm (6 inches):
Wiring terminals
and leads:

Length ≥
     152.4 mm (6 inches)
Wiring terminals
and leads:

Leads ≥ 18 AWG
Wiring terminals
and leads:

Terminal Screw ≥ No. 10 (4.8 mm)
Wiring terminals
  and leads:
  A = fixed part
  B = washer or clamping plate
  C = anti-spread device
  D = conductor spa...
Field Wiring compartment:
Openings for conduit
Field Wiring compartment:
  Openings for conduit
                         +0.79
             Φ 22.22     − 0.38




      ...
Field Wiring compartment:
  the area surrounding
  the knockout




               knockout
                              ...
Field Wiring compartment:
   the area surrounding
   the knockout




                                Φ 29.26



The thick...
Field Wiring compartment:
Volume Calculation
Field Wiring compartment:
Volume Calculation



Note - The usable volume of terminal
compartments should be considered the...
Field Wiring compartment:
Volume Calculation
For a given rangehood which employs 2 supply
leads of 18AWG plus 1 grounding ...
Field Wiring compartment:
Volume Calculation
Usable(net)
        2 supply leads
       within appliance    24.6 × 2 = 49.2...
Field Wiring compartment:
Volume Calculation
Gross = Usable(net) + Tare




49.2 + 98.31 + 12 = 159.51cm   3
Tempered Glass
Non-shattering or

Tempered Glass
UNDERWRITERS LABORATORIES
CERTIFICATION
REQUIREMENT
DECISION 20070814


92.7
Loading test for glass rangehood surfaces

92...
92.8
Tempered glass impact test
Section 5.1
Impact Test
Marking and Instruction
ICC
                        Duct
Mounting Means


NFPA
Power Supply Cord


                    Enclosure




             ...
Rating Label
(e) Marking—
 (1) Identification of manufacturer         (2) Durability. The marking shall be
 and ratings. Electric equip...
62.1 General
62.1.1 An appliance shall be plainly and permanently
marked where visible with:
a) The manufacturer's name, t...
DANGER-




WARNING-




CAUTION-
Duct
Mounting Means
Installation Instruction
64A.3 A small part not provided with the
appliance for mounting shall be referenced
in the installation instructions.
64A....
To Identify


                Remote blower assemblies

CONSTRUCTION                                 Ducted

             ...
Downdraft
by
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
Safety On Rangehood from A perspective of UL 507
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Safety On Rangehood from A perspective of UL 507

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  • How is the rangehood installed in your home evaluated to the US-based standard?

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Safety On Rangehood from A perspective of UL 507

  1. 1. Safety on Rangehood based on UL 507 By May, 2009 All rights reserved. No portion of this material may be reprinted in any form without the express written pe provided in writing.
  2. 2. 工程师
  3. 3. Please make sure your cell pone in mute mode, thanks.
  4. 4. Objective To Be In Awareness of Intention of Safety Regulation (10 min.) Construction Review (120 min.) Marking and Instruction (15 min.)
  5. 5. “You have to learn the rules of the game. And then you have to play better than anyone else.”
  6. 6. Intention of Safety Regulation
  7. 7. Safety Regulation
  8. 8. TO assure safe and healthful working and living conditions for people to prevent loss of life and property damage.
  9. 9. Why not protect the safety of life and property?
  10. 10. Because…
  11. 11. pre·vent Verb, Archaic To anticipate or counter in advance.
  12. 12. Now you know the subtle difference prevent vs.protect
  13. 13. Safety Regulation
  14. 14. Just To prescribe standards to establish benchmarks for all industries
  15. 15. You will see…
  16. 16. So…
  17. 17. To assure safe and healthful working conditions for working men and women; by authorizing enforcement of the standards developed under the Act; by assisting and encouraging the States in their efforts to assure safe and healthful working conditions; by providing for research, information, education, and training in the field of occupational safety and health; and for other purposes. the original
  18. 18. The OSH Act 1970 Occupational Safety and Health Act of 1970 December 29, 1970
  19. 19. Legislation need be embodied into regulations such as 29 CFR.
  20. 20. 29 CFR (Code of Federal Regulations)
  21. 21. Industries work out the nitty-gritty requirements which constitute of various standards.
  22. 22. Nationally Recognized Testing Laboratory (NRTL)
  23. 23. OSHA need authorize and monitor private sector organizations, so NRTL program came into existence.
  24. 24. In the evaluation of the NRTLs, OSHA will use either consensus-based standards currently in use nationally, or other standards or criteria which may be considered appropriate.
  25. 25. The NRTL determines that specific equipment and materials (quot;productsquot;) meet consensus- based standards of safety to provide the assurance, required by OSHA, that these products are safe for use in the U.S. workplace.
  26. 26. NRTLs are third-party organizations recognized by OSHA as having the capability to provide product safety testing and certification services to the manufacturers of a wide range of products for use in the American workplace. The testing and certifications are based on product safety standards developed by U.S.-based standards developing organizations and often issued by the American National Standards Institute (ANSI).
  27. 27. Many product “approval” requirements are found in OSHA’s standards (29 CFR Parts 1910, 1915, 1918, and 1926). Approval, i.e., NRTL testing and certification, is required for many types of products, including – Electrical equipment – Fire detecting and extinguishing equipment – Liquefied Petroleum Gas (LPG) utilization equipment – Equipment to be used in hazardous locations
  28. 28. Regulations can only assure relative safety, not absolute!
  29. 29. I n d u s t r y R e Safety a l i t y Standards are the compromise between safety&health and industry reality such as cost, technology!
  30. 30. Testing are simulation of reality, not reality!
  31. 31. Construction Review
  32. 32. Hazards
  33. 33. Hazards Electric Shock Mechanical Hazard Fire Hazard
  34. 34. Duct Mounting Means Power Supply Cord Tempered Glass Ⅳ Ⅰ Enclosure Impeller Ⅲ (blower wheel) Ⅱ Filter
  35. 35. Ⅰ Your skin is your first protection from the world,
  36. 36. for appliance, so is Enclosure!
  37. 37. 2.3.3 ENCLOSURE - That part of the product that: a) Renders inaccessible all or any parts of the fan that present a risk of electric shock or injury to persons due to total or partial collapse with a resulting reduction of spacings, loosening or displacement of parts, or other serious defects; or b) Retards propagation of flame initiated by electrical disturbances occurring within.
  38. 38. Fire Fire
  39. 39. 2.3.3 ENCLOSURE - That part of the product that: a) Renders inaccessible all or any parts of the fan that present a risk of electric shock or injury to persons due to total or partial collapse with a resulting reduction of spacings, loosening or displacement of parts, or other serious defects; or b) Retards propagation of flame initiated by electrical disturbances occurring within.
  40. 40. Enclosure Material: Metal Gavanized sheet steel, 0.74 mm Uncoated sheet steel, 0.66 mm Nonferrous sheet steel, 0.91 mm Non-Metal Polymeric material, ? mm
  41. 41. 6.3 Non-metallic enclosures 6.3.1 A non-metallic enclosure shall comply with the applicable mechanical and electrical property considerations, flammability, and thermal requirements as specified in the Standard for Polymeric Materials - Use in Electrical Equipment Evaluations, UL 746C.
  42. 42. UL 746C:
  43. 43. Mechanical requirement: Ball Impact Test [polymeric enclosure] This ball?
  44. 44. Mechanical requirement: Static Load Test For Mounting Means [complete unit]
  45. 45. Mechanical requirement: Mold Stress Relief Test [polymeric parts] BECAUSE Internal Stress results from molding or fabrication process!
  46. 46. 2.3.3 ENCLOSURE - That part of the product that: a) Renders inaccessible all or any parts of the fan that present a risk of electric shock or injury to persons due to total or partial collapse with a resulting reduction of spacings, loosening or displacement of parts, or other serious defects; or b) Retards propagation of flame initiated by electrical disturbances occurring within.
  47. 47. 8 Accessibility of Moving Parts :
  48. 48. 9 Accessibility of Live Parts :
  49. 49. Duct Mounting Means Power Supply Cord Tempered Glass Enclosure Impeller (blower wheel) Ⅱ Filter
  50. 50. Ⅱ Entirely of metal Filter Activated carbon contained [R/C as Class 1 or 2 to UL 900]
  51. 51. A REUSEABLE METAL Filter can act as safeguard against mechanical hazard such as rotating impeller
  52. 52. Duct Mounting Means Power Supply Cord Tempered Glass Enclosure Impeller Ⅲ (blower wheel) Filter
  53. 53. Ⅲ Metal Impeller Polymeric material
  54. 54. Polymeric Impeller Material parameters: HDT [Heat Deflection Temperature] 75 ℃ @ 455.07 kPa RTI 60 ℃
  55. 55. Polymeric Impeller Material parameters: HDT [Heat Deflection Temperature] 75 ℃ @ 455.07 kPa
  56. 56. UL 746C:
  57. 57. Duct Mounting Means Power Supply Cord Tempered Glass Ⅳ Enclosure Impeller (blower wheel) Filter
  58. 58. Ⅳ Power supply cord POWER SUPPY Field wiring
  59. 59. Power supply cord: 91.6.4 For cord-connected rangehoods, the cord type shall be one of the following: HS, HSO, HSJ, HSJO, S, SE, SO, SOO, ST, STO, STOO, SJ, SJO, SJOO, SJT, SJTO, or SJTOO.
  60. 60. Power supply cord: 91.6.5 The length of a rangehood cord shall not be less than 3 ft (0.9 m) and shall not be more than 4 ft (1.22 m), 3 ft (0.9 m) ≤ length ≤ 4 ft (1.22 m)
  61. 61. Power supply cord: 91.6.8 The attachment plug of a power supply cord for a cord-connected rangehood shall be of the grounding type.
  62. 62. Power supply cord: 91.6.11 A flexible power supply cord for a cord- connected rangehood shall vertically exit the top- most horizontal surface of the rangehood.
  63. 63. Field wiring:
  64. 64. Article 300 – Wiring Method 300.15 Boxes, Conduit Bodies, or Fittings — Where Required
  65. 65. 152.4 mm (6 inches):
  66. 66. Wiring terminals and leads: Length ≥ 152.4 mm (6 inches)
  67. 67. Wiring terminals and leads: Leads ≥ 18 AWG
  68. 68. Wiring terminals and leads: Terminal Screw ≥ No. 10 (4.8 mm)
  69. 69. Wiring terminals and leads: A = fixed part B = washer or clamping plate C = anti-spread device D = conductor space Screws need retaining means for conductors, such as upturned lugs, a cupped washer, or the equivalent
  70. 70. Field Wiring compartment: Openings for conduit
  71. 71. Field Wiring compartment: Openings for conduit +0.79 Φ 22.22 − 0.38 knockout Φ 29.26 Surrounding flat surface Unit: mm
  72. 72. Field Wiring compartment: the area surrounding the knockout knockout Φ 29.26 Surrounding flat surface Unit: mm
  73. 73. Field Wiring compartment: the area surrounding the knockout Φ 29.26 The thickness of sheet steel at grey area ≥ 0.81 mm
  74. 74. Field Wiring compartment: Volume Calculation
  75. 75. Field Wiring compartment: Volume Calculation Note - The usable volume of terminal compartments should be considered the net volume less the volume of any components located within the terminal compartment such as capacitors, switches, relays, and terminal blocks.
  76. 76. Field Wiring compartment: Volume Calculation For a given rangehood which employs 2 supply leads of 18AWG plus 1 grounding lead, there are 1 capacitor of 4 cm by 3 cm by 1 cm within the field wiring compartment: Branch supply conductors within House, 14 AWG
  77. 77. Field Wiring compartment: Volume Calculation Usable(net) 2 supply leads within appliance 24.6 × 2 = 49.2cm 3 32.77 × 3 = 98.31cm 3 2 branch supply conductors plus 1 equipment grounding conductor Tare 1 capacitor 4 × 3 × 1 = 12cm 3
  78. 78. Field Wiring compartment: Volume Calculation Gross = Usable(net) + Tare 49.2 + 98.31 + 12 = 159.51cm 3
  79. 79. Tempered Glass
  80. 80. Non-shattering or Tempered Glass
  81. 81. UNDERWRITERS LABORATORIES CERTIFICATION REQUIREMENT DECISION 20070814 92.7 Loading test for glass rangehood surfaces 92.8 Tempered glass impact test
  82. 82. 92.8 Tempered glass impact test
  83. 83. Section 5.1 Impact Test
  84. 84. Marking and Instruction
  85. 85. ICC Duct Mounting Means NFPA Power Supply Cord Enclosure UL 1598 Lamp AHJ Clearance
  86. 86. Rating Label
  87. 87. (e) Marking— (1) Identification of manufacturer (2) Durability. The marking shall be and ratings. Electric equipment of sufficient durability to withstand may not be used unless the following the environment involved. markings have been placed on the equipment: (i) The manufacturer’s name, trademark, or other descriptive marking by which the organization responsible for the product may be identified; and (ii) Other markings giving voltage, current, wattage, or other ratings as 29CFR1910.303 necessary.
  88. 88. 62.1 General 62.1.1 An appliance shall be plainly and permanently marked where visible with: a) The manufacturer's name, trademark, or other descriptive marking by which the organization responsible for the product is identified - hereinafter referred to as the manufacturer's name; b) A distinctive catalog number or the equivalent; c) The electrical rating; and d) The date or other dating period of manufacture not exceeding any three consecutive months. See 62.1.2. For a permanently-connected appliance, the marking shall be visible after installation. UL 507
  89. 89. DANGER- WARNING- CAUTION-
  90. 90. Duct Mounting Means
  91. 91. Installation Instruction
  92. 92. 64A.3 A small part not provided with the appliance for mounting shall be referenced in the installation instructions. 64A.4 An accessory for a permanently installed fan shall be provided with instructions detailing proper installation procedures.
  93. 93. To Identify Remote blower assemblies CONSTRUCTION Ducted Integral blower assemblies Non-ducted Ceiling/Island Mount INSTALLATION Wall Mount Under-Cabinet Mount
  94. 94. Downdraft
  95. 95. by

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