The value of 1 revolution of the meter disk, Expressed in watt hours.
R_{r}
Register Ratio
The number of turns of the 1^{st} gear of the register to cause the 1^{st} (or right hand) dial pointer to complete 1 full revolution which = 10,000 watt hours or 10kwhrs.
R_{g}
Gear Ratio
The number of turns of the meter disk to cause the 1^{st} (or right hand) dial pointer to complete 1 full revolution = 10,000 watt hrs or 10kwhrs."
R_{s}
Reduction at Shaft
The ratio between the number of teeth on the 1^{st} gear of the register to the number of entries on the disk shaft.
K_{r}
Register Constant or Multiplier
Multiplier of the register, due to gearing.
TF
Transformer Factor
Multiplier of the register, due to CT’s and/or CT X PT ratios.
PKh
Watt-hour Constantx Transformer Factor
Demand
The average rate of consumption over a specific period of time
Power
An electrical load expressed in watts or kilowatts without a relationship to time.
E x I=Watts
Energy
An electrical load expressed in watts or kilowatts times the number of hours it’s used.
E x I x time factor = Kwhr
Blondel's Theorum
In a system of N-conductors, N-1 metering elements properly connected, will measure power and/or energy consumed, provided that all potential coil(s) have a common connection in which no current circuit(s) are connected.
A 10,000 amp current limiting fuse disconnect ahead of the meter, located on the same wall as the meter within 2 feet of the meter.
(Cordova's definition)
The utilization of a fault current limiting disconnect device between the electric meter and the supply source.
HOT SEQUENCE METERING
The electric meter is connected directly to the service conductors without the use of a fault-current limiting disconnect or meter safety-switch device between the electric meter and the supply source.
HIGH-LEG
(Wild or Power leg)
The phase having the higher phase voltage to ground on a 4-wire delta-connected service, where the midpoint of one phase winding is grounded.
SERVICE MAST
The service mast is the conduit containing the service-entrance conductors where the point of attachment and the connection between the service drop and the service-entrance conductors is located above the roofline. The conduit extends to a point, and the weather head is located, above the roof eave. The conduit passes through the eave of the building or extends past the roofline without passing through the eave. The means of attachment is attached to the service mast.
When are class 2 rubber gloves required?
For cutting service drops during fire.
Are hard hats required every time you're outside of your truck?
no
DATA PULSES
Output pulses (KYZ) generated by the electric meter for use by the Customer.
SERVICE RISER
The service riser is the conduit containing the service-entrance conductors where the point of attachment and the connection between the service drop and the service-entrance conductors is located on a pole or below the roofline of the building being served. The conduit extends to a point, and the weather head is located, below the roof eave. The means of attachment is secured to the pole or building and is not attached to the service riser.
POINT OF ATTACHMENT
The point at which the service-drop conductors are attached to a building or other structure.
CURRENT TRANSFORMER (CT)
An instrument transformer designed for the measurement or control of current.
EMT
Electric Metallic Tubing
GRC
Galvanized Rigid Conduit
IMC
Intermediate Metallic Conduit
ISOLATED TRANSFORMER BANK
A transformer bank which provides electrical service to a single customer.
NEC®
NATIONAL ELECTRICAL CODE
A publication of the National Fire Protection Association, Inc.
NESC®
NATIONAL ELECTRICAL SAFETY CODE
A publication of the Institute of Electrical and Electronic Engineers, Inc. as adopted by ANSI.
PVC
Polyvinyl Chloride
RACEWAY (gutter)
Any channel for holding bus bars, cables, or wires, which is designed for this purpose.
RESIDENTIAL METERING
Metering of services used for the exclusive use of the individual customer for domestic purposes.
SECONDARY CONDUCTORS
The part of the Company's distribution system, which connects the secondaries of the Company’s distribution transformers to the service drop or service lateral.
AUTHORIZED CLOSED LOOP
Authorized use of electric service that is temporarily not being metered.
When electric meter employees are working on Company premises other than electric meter shops, they shall conform to the safety rules of other departments?
True or False
True
Section 330.08 of safety manual
Register Ratio Formula
10,000 x Kr
TFxKhxRs
Watts Formula
Kh x 3600 x revs
Time in seconds
Demand Formula
E x I x CC x TF
1,000
(I = applied amps)
What is the vertical clearance from ground for service-drops over other land traversed by vehicles?
16 feet
What is the max height of the point of attachment from final grade?
24 feet
How many days max can the company grant permission to close a loop
7 Calendar days
What size and material is required for service masts?
2” minimum GRC
Can conduit couplings be installed above the roofline
No
Can phone loops, cable TV conductors, grounding clamps, etc. be attached to the service mast.
No, only the Company’s power service-drop conductors shall be attached to a service mast.
Are line and load conductors permitted in the same raceway or conduit.
No
When are junction boxes, conduit fittings (e.g. LB’s), or other devices allowed?
Only with specific written approval from the Company’s local Electric Meter Department.
When can the Company authorize a closed loop on new electrical services.
Never on NEW services
What is the maximum length of #2 triplex service drop conductor to residential and commercial installations?
90 feet
What is Pythagorean's Theorem
(use to solve problem)
c2 = a2 + b2
Using the basic laws of Trigonometry solve/prove that the wild (high) leg is 208 volts from center tap neutral on a 120v/240v delta system.
Using the basic laws of Trigonometry solve/prove that the phase-to-phase wye voltage is 208 volts.
What is the maximum service span for a 1/O service?
80 feet
What is the maximum service voltage that can be attached directly to a building (except substations or transformer rooms)
2400 volts
How many feet must conduit extend beyond hardscape edge when service conductors are under hardscape?
2 feet
What is the minimum depth of UG service laterals?
24 inches
What are the length, diameter and material type of slip sleeves?
18" long, Schedule 40PVC for 2 1/2" diameter
18" long, Schedule 80PVC for 3" diameter
Can the bottom center knockout of a meter housing be used for line side UG conductors entering the housing?
No
What is the maximum length for an OH temp service drop?
70 feet
What is the maximum allowable number of risers on a building?
6 with only one set of conductors in each
What is the maximum number of cables in a standard single-phase pedestal with a 6-position URD mole?
15
Should all electrical equipment be considered energized?
Yes, per safety manual.
Which safety rules apply when EM employees are working on company premises other than EM shops?
The Safety rules of other departments
When are Lineman's class 2 or higher rubber gloves required to be worn?
When cutting service drops at a fire or similar emergency.
When can 2 employees work off a single ladder?
Never!
What is the maximum allowable metered load?
4,000 amps
Mast supports are required if the service attachment point exceeds what height?
48"
What is the maximum service span for a 4/O service drop?
70 feet
Service conductors must be in conduit when under hardscape. How many inches must conduit extend past the hardscape edge.
24
U-guard risers shall be grouped together and shall not occupy more than what percent of the pole?
40%
What are the minimum dimensions of a 200amp meter housing?
19" tall by 13" wide
Where and how must apartment numbers be marked?
By permanent durable means at the meter socket, corresponding breaker, tenant entrance.
What is the max distance the point of attachment shall be located from the weatherhead?
24"
Can a stamped brass address tag be on any location of the meter housing?
No.
Must be on a non-removable portion.
What is the minimum length for a residential service entrance conductor?
24"
What is the minimum length for a commercial service entrance conductor?
36"
What is the vertical clearance from ground for service-drops over spaces and ways to subject to pedestrians?
12 feet
What is the vertical clearance from ground for service-drops over driveways, parking lots, and alleys?
16 feet
What is the vertical clearance from ground for service-drops over other land traversed by vehicles?
16 feet for triplex, quadraplex, etc
16.5 feet for open wire
What is an Ohm?
The practical unit of electric resistance.
What is a demand register?
A mechanism that indicates maximum demand and also registers energy used
What is a cycle?
One complete set of positive and negative values of an alternating current or voltage
What is the min/max height for single meter installations. (final grade to meter center)
4' min, 6' max
What is the min/max height for multiple indoor meter installations. (final grade to meter center)
2' min/6.5' max
Define Volt
The practical unit of electromotive force or potential difference.
How many services (delivery points) per building?
Only 1 except for
- emergency lighting
- optional standby systems
- parallel power production systems
- capacity requirements
Who installs and maintains the point of attachment?
The customer
What is the min/max height for multiple outdoor meter installations. (final grade to meter center
3' min / 6.5' max
What are the minimum depths of working space in front of metering equipment?
3'
3' 6"
4'
Depending on material (how fire proof) NEC mandates.
Do all meters need to be installed outdoors unless approved by the meter department?
Yes
Underground temporary service ground rods will be installed by the customer within all utility easements. T or F
False.
Must be outside utility easements (pg 43)
What are the 3 sides of a right triangle?
Hypotenuse, Adjacent, Opposite.
Using Trig functions, prove phase to phase voltage on a Wye system.
Using Pythagorean Theorem, prove wildleg voltage on a Delta system.
What is the formula to determine "True Power"? (solve problem)
E x I x Cosine theta = Watts
What is the formula to determine "Apparent Power"? (solve problem)
VA(volt amps)=E x I
Solve 4 problems using trig functions.
Draw A-base and Socket
FM1, FM2, FM12, FM14, FM15, FM16
Draw and connect applicable A-base and Socket meters for:
Single phase delta bank
4W3phase Delta bank
4W3phase Wye bank