Clearance Requirements

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electric
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125794
Filename:
Clearance Requirements
Updated:
2016-07-07 09:56:41
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Electric Meter
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Clearances
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  1. What is the clearance requirement of the point of attachment to the weatherhead?
    Within 24"
  2. What is the min/max height for multiple indoor meter installations. (final grade to meter center)
    2' min/6.5' max
  3. How many services (points or delivery) will be provided to a building or other structure?
    One
  4. Additional services may be provided by the company for what condition
    • -Optional standby systems
    • -Capacity Requirements
    • -Parallel power production systems
    • -Emergency lighting
  5. Is the point of attachment installed and maintained by the customer.
    Yes
  6. Within _____ inches of the weatherhead shall the point of attachment be located?
    24"
  7. What is the minimum length of service entrance conductors on residential services?
    2 feet
  8. What is the minimum length of service entrance conductors on commercial services?
    3 feet
  9. What vertical clearance is required over spaces and ways to subject to pedestrians?
    12 feet
  10. What vertical clearance is required over driveways, parking lots, and alleys?
    16 feet
  11. What vertical clearance is required over other land traversed by vehicles
    16 feet
  12. What is the maximum height the point of attachment shall above final grade?
    24 feet
  13. For existing services, the Company may grant permission to close a loop for up to a maximum of ____ calendar days?
    7
  14. What is the maximum service span for a 4/0 service drop
    70 feet
  15. What is the maximum service span for a 1/0 service drop
    80 feet
  16. What is the maximum overhead service voltage that can be attached directly to a building except where such building is used as a substation or transformer room.
    2400 volts
  17. Service conductor under hardscape shall be in conduit where the conduit extends ______beyond the hardscape edge.
    2 feet
  18. What is the minimum depth of service laterals?
    24 inches
  19. What are the required size and material of Slip Sleeves?
    • 18” length 2 ½” Dia. Schedule 40 PVC
    • or
    • 18” length 3” Dia. Schedule 80 PVC
  20. Can the center knockout in the bottom of the socket be used for line side UG conductors entering socket.
    No
  21. What is the maximum length for an overhead service drop to a temporary service?
    70 feet
  22. What is the maximum number of service entrance risers on a building?
    Six
  23. U-guard risers shall not occupy more than _____% of the pole circumference.
    40%
  24. What is the maximum number of cables in a standard single-phase pedestal, with six-position URD moles?
    15
  25. Should all electrical equipment be considered energized?
    Yes
  26. When electric meter employees are working on company premises other than electric meter shops, they shall ______.
    Conform to the safety rules of other departments
  27. When shall required Lineman’s class “2” higher rubber gloves be worn?
    When cutting service drops at a fire or similar emergency
  28. Is it required to wear a hard hat every time you’re outside your truck.
    No
  29. How many employees may work off of the same ladder?
    Only one
  30. What is the maximum amperage allowed on any metered load?
    4000 amps
  31. Can conduit coupling be installed above the roofline?
    No
  32. Can Phone loops, cable TV conductors, grounding clamps, etc. be attached to the service mast.
    No
  33. What is the maximum height of the point of attachment above the roofline?
    48 inches
  34. Are junction boxes, LB’s, or other devices allowed with specific written approval from the Company’s local Electric Meter Department.
    Yes
  35. Must all meters shall be installed outdoors unless approved by the meter department for indoor location.
    Yes
  36. What is the minimum size and material a service mast shall be?
    2” GRC
  37. Must underground temporary service ground rod will be installed by customer on temporary panel OUTSIDE all utility easements?
    yes
  38. What is the minimum depth of working space in front of metering equipment?
    • 3 feet,
    • 3 1/2 feet or
    • 4 feet
    • (depending on the fire rating)
  39. What height shall outdoor multiple meter sockets, vertically aligned be mounted at to center of meter?
    3’ min to 6.5’ max
  40. What height shall indoor multiple meter sockets, vertically aligned be mounted at to center of meter?
    2’ min to 6.5’ max
  41. What height must a single meter be mounted?
    (center of glass)
    4' min to 6' max
  42. Is a stamped brass address tag is required on any location of meter socket.
    No. A non-removable portion only.
  43. How and where must unit numbers on apartments must be marked?
    By a permanent durable means at the meter socket and corresponding main service breaker, tenant panel board, doorway or entrance
  44. What is the minimum dimensions on a 200 amp individual meter socket
    19” high by 13” wide
  45. What is the maximum length of #2 triplex service drop conductor to residential or commercial installations?
    90 feet
  46. Is an authorized closed loop allowed on new electrical services.
    No
  47. Are Line and load conductors permitted in the same raceway or conduit.
    No
  48. When shall Service Mast braces or guyes be used?
    When the WEATHERHEAD is more than 48 inches above the roofline.
  49. What is the clearance requirement of the point of attachment to final grade?
    Maximum 24'
  50. What is the clearance requirement for service drops and loops over pedestrian spaces? (Per NESC)
    • 12' min for 600V or less
    • 10.5' min - insulated drops less than 300V


    (normally 12', but can be 10.5')
  51. What are the clearance requirements for service drops and drip loops over driveways? (Per NESC)
    16' min for 600V or less
  52. What are the clearance requirements for service drops not readily accessible to pedestrians?
    3.5' for multiplex
  53. What are the clearance requirements for service drops and drip loops for land traversed by vehicles?
    16' min
  54. What is the minimum size and material type for a service mast?
    2" GRC
  55. What are the clearance requirements for the service mast above the roofline?
    48" max
  56. Are service mast couplings allowed above the roofline?

    Below?
    Not above, but below is ok.
  57. What is the required length of the service entrance conductors?
    • 36" min commercial
    • 24" min residential
  58. What is the maximum OH service Voltage that can be attached directly to a building (except substation or transformer room)?
    2400V
  59. UG line & load conductors shall enter & exit the same side of the socket.

    True or False?
    False
  60. How many U-guards are allowed per pole?

    Encompassing what % of the pole?

    How many conductors per each U-guard?
    3 U-guards max

    40% of pole max

    One set of conductors per U-guard (750 max)
  61. What is the maximum number of service risers per building?
    6 max, with a single set of conductors in each riser.
  62. Can UG laterals pass through a wall below grade or above the 1st floor level?
    No.
  63. Can load conductors exit through either end of horizontals, back or verticals?
    No, NOT the left!
  64. On lever bypass type housings, load conductors shall exit right or lower rear knockouts.

    True or False
    True
  65. Can customer owned conduit be attached to our pole?
    No. Not more than 6" above final grade.
  66. How many feet of customer owned conductor must be coiled at the base of pole?
    32'
  67. How many secondary runs per phase on a 3 phase padmount transformer?
    8 runs per phase (24 total)
  68. How many days may closed loops be authorized?
    7 calendar days. (or temp meter must be installed)
  69. If we own/maintain the lateral, how many residential units can be grouped at one location?
    6 Max

    If house meter used, or more than 6 units, the customer owns/maintains lateral.
  70. What is the max amperage for self contained meters?
    400amps then CTs must be used.
  71. What is the max breaker size that can be used for a 200amp meter?
    250amp breaker
  72. What is the max breaker size for a 320amp meter?
    400amp
  73. In what situation can we install a k-base meter?
    No longer allowed per BB.
  74. What metering rates does Xcel use
    • SG-Secondary General
    • C-Commercial
    • R-Residential
    • RD-Residential demand
    • PG- Primary General
  75. Are closed loops allowed on new services?
    No.
  76. Where must the high-leg be located in the meter housing?
    In breaker panel?

    Per NEC
    • In meter housing on the right.
    • In breaker panel in the center.
  77. What is the maximum metered service size?
    4000 amps.
  78. Are "rack mounted" doughnuts/window type CTs allowed?
    No. Not on racks.
  79. Are grecian urns (bushing mount in xfrmr)allowed?
    No.
  80. What size, type, and length max conduit must be run underground to the CT cabinet?
    • Min 1" sched 80PVC
    • 25' max
  81. What size, type, and length max conduit must be run above ground to the CT cabinet?
    Min 1" GRC, IMC, or EMT 25' max

    • Min 1-1/4" GRC, IMC, or EMT
    • 25'-100'

    Max 180 degrees of bends if over 25'
  82. When may ice and snow shields be required?
    In heavy snow/ice areas and above 6000' elevation.
  83. What is the required size and material of slip sleeves?

    Who provides and installs them?
    18" in length (9" above & below ground)

    • 2 1/2" sched 40PVC or
    • 3" sched 80PVC
  84. How many services will be supplied to a building or other structure?
    Only one. Per NEC
  85. Are jumpers allowed on new services?
    No. Only rewires.
  86. What is the minimum depth of UG service laterals?
    24"
  87. What is the max length of the following service drops? #6, #4, #2, 1/0, 4/0, 500

    (service pole must be used if exceeds)
    • #6 - 110'
    • #4 - 110'
    • #2 - 90'
    • 1/0 - 80'
    • 4/0 - 70'
    • 500 - 50'
  88. How many runs of 350cmil per ped?
    5 per ERT mold(4 services, 1 streetlight)

    (plus 1 feed for a 6-block ERT mold)

    So, 18 total cables (3ERT blocks @ 6 ea)
  89. Per Blue Book, can the center knockout (bottom) of the meter housing be used?
    No.
  90. Can knockouts on either side of horizontal or verticle surfaces be used for load conductors?
    Yes
  91. UG temp ground rods will be installed by the customer, not less than 5' from the pedestal. True or False
    True
  92. UG temp ground rods will be installed by the customer, not less than 5' from the pedestal. True or False
    True
  93. Can temporary services be attached to trailers or vehicles?
    No
  94. Which of the following must be displayed on a temp?

    A. Voltage
    B. Amperage
    C. Meter size
    D. Service address
    D. Service address
    (this multiple choice question has been scrambled)
  95. What is the Max length of 4/0 conductor from the company pole to a temp?

    What is the vertical angle of the drop?
    • 70' max
    • Must be greater than a 45 degree angle.
  96. What is the minimum distance a OH temp can be from a company pole?
    10'
  97. UG temp supports shall be where in regards to the utility easement?
    Inside? or Outside?
    Outside
  98. How far must UG temp supports be from a pedestal?
    • Pole type - 6' min
    • Brace type- 5' min
  99. What are the BB requirements for self-contained meter housings?
    • -Steel sockets (no aluminum except on multiple metering)
    • -5th terminal in 9:00 position connected with 16AWG wire min.
    • -7th terminal connected w/16AWG min
    • -Ringless cover, no screws
    • -Locking jaw bypass on the right side.
    • -Must accomodate a meter seal and padlock.
  100. What are the ID requirements on the following installations?
    Commercial-
    Multiple Residential-
    Single residence-
    • -ID must be a brass, steel or aluminum tag attached to the non-removable portion of the meter socket
    • -Unit number must also be permanently marked on the breaker, and entrance to the premise
  101. What additional BB requirement does a 320amp meter socket have?
    Anti-inversion clip on top right terminal.
  102. When are horn-type sockets allowed?
    • On UG 200amp temp housings
    • On OH 100 or 200amp temp housings
  103. What is the required height and width of the following meter housings?
    200amp
    320amp
    • 200amp 19"h x 13"w
    • 320amp 26 1/2"h x 13"w
  104. What 3 additional requirements apply to multiple meter housings?
    • - Can be steel or aluminum
    • - Must have a permanent barrier to isolate the disconnect switch
    • - Each line-side compartment must accomodate a meter seal even if there is no meter present.
  105. What are 4 Metering Pedestal requirements?
    • -Furnished, installed and maintained by customer.
    • -Separate covers on disconnect switch, wiring area, and metering area
    • -If enclosed, must have a 8"x8" lexan viewing area
    • -Door hinged on right or left. (can be top-hinged with prior approval if it can be propped open with a locking mechanism)
  106. Which of the following structures can meters be attached to?
    Mobile homes, construction trailers, fences, manufactured homes.
    Only to manufacured homes if on a permanent foundation.
  107. Meters must be located adjacent to and within line of site of the mobile structure it serves (mobile homes, construction trailers, etc)

    True or False
    True
  108. What considerations must be taken into account for determining meter locations?
    • -May not interfere with sidewalks, driveways or passageways
    • -Can't obstruct doors or windows
    • -Can be hazardous or impracticle
  109. For Primary Metering, where is line-side conduit required?
    From the point of delivery to the meter cabinet.
  110. What are the mounting heights for the following?
    Single meters-
    Indoor multiple meters-
    Outdoor multiple meters-
    • Single meters- 4'min-6'max
    • Indoor multiple meters- 2'min-6.5'max
    • Outdoor multiple meters-3'min-6.5'max
  111. What are the clearances in front of meters?
    • 3', 3.5', or 4' deep per NEC
    • and 2.5' wide
  112. What the clearance requirements for gas regulators radially from:
    -doors, windows, attic/dryer vents?
    -Air intakes?
    • -doors, windows, attic/dryer vents -----3'
    • -Air intakes----6'
  113. What is the clearance requirement for electrical equipment either side, or directly above a gas meter set?
    12"min
  114. What is the clearance requirement for electrical equipment from a propane tank refill valve?
    15'
  115. What size fire wall/barrier can be attached to a building if clearance requirements can't be met for oil-filled equipment (transformers etc) near buildings?
    Wall must be rated for a 2hour fire and shall be twice the width and height of the equipment (transformer)

    Must be 30" min from the equipment
  116. When are the following allowed?
    -Junction boxes?
    -LBs?
    -Line & load conductors in the same raceway?
    • Junction boxes - with approval
    • LBs - with approval
    • Line & load conductors in the same raceway - never
  117. How many runs per single phase transformer?
    • -4 runs if greater than 350mil
    • -6 runs for residential (4 runs of 350 plus 2 runs of 4/0)
    • -8 runs if 4/0 or smaller
  118. When may we charge a re-connect fee?
    If a service is disconnected by someone other than the company.
  119. What are the clearance requirements of a pad-mount transformer away from a door?
    • 20' min in front (outward) of a door
    • 10' min either side of a door
  120. What are the clearance requirements of a pad-mount transformer away from an air intake?
    10' min either side, above or in front.

    If the air intake is more than 10' above ground, then a 25' min clearance is required.
  121. What are the clearance requirements of a pad-mount transformer away from a window or opening?
    - First Story
    - Second Story
    • - First Story:min 10' outward, 3' either side
    • - Second Story:min 5'
  122. What are the clearance requirements of a pad-mount transformer away from a combustible wall or overhang?
    10'min

    If terrain is not pitched away from the building, a sump shall be installed.
  123. What are the clearance requirements of a pad-mount transformer away from a fire escape?
    • 20' min
    • (10' min if fire wall/barrier is present)
  124. What are the clearance requirements of secondary services for roofs accessible to pedestrians by doorway, ramp, stair or ladder?
    • 11' triplex
    • 11.5' open wire
  125. What are the clearance requirements of secondary services for roofs accessible to trucks?

    Other vehicles (not trucks)?
    • trucks- 16' for triplex
    • 16.5' for open wire

    • Other vehicles (not trucks)- 11' triplex
    • 11.5' open wire
  126. What size and type pole is required for temps?

    Who installs/furnishes?
    • min 4"x4" class 7 min, or class 6 pole
    • 30' high for OH
    • installed by customer

    (1200ft per lb strength)
  127. What is the min depth for temp poles?

    OH pole circumference.
    • 4' OH
    • 24" UG

    23.5" @ ground level, 5" @ top
  128. What is the min distance a temp support brace can be from the point of attachment?
    12"
  129. Service equipment on temps must be supplied by the company.

    True or False?
    False. Customer supplies.
  130. Temp support stakes must be what depth?
    12" max
  131. What size must temp meter sockets be?
    11" min.
  132. Is the 5th (or 7th) terminal required on temps?

    Lever bypass?
    Yes for terminals

    No for bypass (Colorado is excepted from)
  133. What length conductor must be available for termination in an UG ped for a post type temp? (TM20)
    36"
  134. What is the min conductor size in a temp?
    min #6
  135. Do temps need to be cold sequenced?

    Why or why not?
    As a commercial unit, no need to be if it is one single phase meter, one loop, where the Fault Current is below 10,000 amps
  136. What is the size and length of liquitite required for temps?
    • Min 1", max 1-1/2" diameter
    • 12' long
  137. For OH temps, what is the required height from ground to point of delivery?
    12'min 16'max
  138. What size must temp braces be? (TM30)
    • 2"x4" min
    • extending 3' min from the base
  139. Where must the 5th terminal tickler be connected?
    Tied to N in meter housing. (Not to ground, as the ground may inadvertently get cut)

    Connect 5th terminal 1st, then tie to N to reduce chance of short by having grounded wire flailing around in housing.
  140. What is the min size and material type for a riser?
    • Minimum - Sched 80 pvc (GRC stronger)
    • 2" min for 200 amp
    • 3" min for 320 amp
  141. What is the clearance requirement of a snow shield from the meter socket?
    12" min
  142. Main breaker or load center, if required, shall be mounted on the right side of the meter.
    True or False
    True
  143. What is the Clearance Requirement from the drip loop to the roof?
    18" min
  144. What is the Clearance Requirement for conduit to extend beyond concrete, blacktop or patio installed by the customer?
    2'
  145. What size crimping dye should be used for insulinks and buttsplices:
    -up to 2/0?
    -3/0 to 4/0?
    • -up to 2/0 : 5/8th dye
    • -2/0 to 4/0 : 840 dye
  146. What size crimping dye should be used for side-by-side buttons:
    - #1 & 2?
    - #3,5,6 & 7?
    • - #1 & 2 : "O" dye
    • - #3,5,6 & 7 : "D" dye (crimper itself)
  147. What are 2 ways to check for 240 shorts in a ped if 1 leg is connected?
    If short exists, wiggie will show 120V N to shorted leg and 240V phase to shorted leg.
  148. How many temp drawing are there?
    • 3
    • TM10 - OH
    • TM20 - UG Post type
    • TM30 - UG Brace type
  149. What is the rule of thumb for pole depths?
    • 10% of pole height + 2'
    • so, 5' deep for a 30' pole
  150. If an installation (similar to a temp) is Permanent, what are the additional requirements?
    • - must have two 6"x6" treated wood posts or two 4" GRC posts or two unistruts
    • (buried 36" deep)

    - min 3/4" exterior plywood or unistrut
  151. What size jumper wire should be used for a meter housing for a 2 wire preferred method?
    #10 minimum

    (SC160, 170)
  152. Where should the 5th terminal be connected to on a 3W3phase housing?
    To the grounded phase within the meter socket.

    (SC130)
  153. What is the Clearance requirement between meter housings?
    2" min
  154. What are the clearance requirements of a service drop from a window:
    Horizontal- triplex?
    Horizontal- open wire?
    Vertical?
    • Horizontal- triplex: 3'
    • Horizontal- open wire: 5.5'
    • Vertical: 0
  155. What is the clearance requirement of a drip loop over a deck/balcony?
    • Triplex- 11'
    • Open wire up to 750V- 11.5'
    • Open wire over 750V- 13.5'

    (same as hot tubs)
  156. What is the CR of a service drop passing over a 4' overhang (less than 6' in length)?

    If crossing more than 6' of roof, what is the CR after the 1st 6'?
    18"

    3'
  157. What is the CR for electric meter from a propane refill valve?
    12'
  158. What is the CR of a gas regulator from a common building opening (door, window)?
    3'
  159. What is the CR of secondaries and services from roofs accessible to pedestrians by ramp, doorway, stair, or ladder?
    11'
  160. What is the CR of multiplex from roads, alleys, residential driveways, parking lots, etc?

    Open wire?
    16'

    16.5'
  161. What is the CR for services to roofs NOT readily accessible to pedestrians?
    3.5'
  162. If the height won't permit 16' over a residential driveway, it may be reduced to what?
    Insulated service drops:
    Insulated drip loops:
    • Insulated service drops: 12.5'
    • Insulated drip loops: 10.5'
  163. What is the CR of a service drop above a sidewalk?
    12'
  164. What is the CR of multiplex from edge of pool, Base of diving platform, water surface?

    Diving platform?

    Hot tubs?
    • 22.5'
    • 14.5'
    • 11'
    • (add 6" to each for open conductors, then an additional 2' for primary)
  165. What is the CR for UG laterals to a pools?

    To patios?
    5' (per Joe- Sched 40 UG, Sched 80 above ground)

    1'

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