The value of 1 revolution of the meter disk, Expressed in watt hours.
Register RatioThe number of turns of the 1st gear of the register to cause the 1st (or right hand) dial pointer to complete 1 full revolution which = 10,000 watt hours or 10kwhrs.
Gear RatioThe number of turns of the meter disk to cause the 1st (or right hand) dial pointer to complete 1 full revolution = 10,000 watt hrs or 10kwhrs.
Reduction at ShaftThe ratio between the number of teeth on the 1st gear of the register to the number of entries on the disk shaft.
Register Constant or Multiplier
Multiplier of the register, due to gearing.
Transformer FactorMultiplier of the register, due to CT’s and/or CT X PT ratios.
Watt-hour Constantx Transformer Factor
The average rate of consumption over a specific period of time
Define Cold Sequence Metering
The utilization of a fault current limiting disconnect device between the electric meter and the supply source, adequate to protect meters from excessive fault currents.
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.
What is the maximum service span for a 4/O service?
Register Ratio Formula
10,000 x Kr TFxKhxRs
Kh x 3600 x revsTime in seconds
10,000 x KrTF x Kh x Rr
Rr x Rs
Define Hot Sequence Metering
The electric meter is connected directly to the service conductors without the use of a fault-current limiting disconnect device between the electric meter and the supply source.
Define High (Wild) 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.
Draw and label FM1,2,12,14,15,16,5,6,8,9 socket meters
Define 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 weatherhead is located, above the roof eave. The means of attachment is attached to the service mast.
Define 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 weatherhead 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.
What is the max distance the point of attachment shall be located from the weatherhead?
What is the minimum length for a residential service entrance conductor?
What is the minimum length for a commercial service entrance conductor?
What is the vertical clearance from ground for service-drops over spaces and ways to subject to pedestrians?
What is the vertical clearance from ground for service-drops over driveways, parking lots, and alleys?
What is the vertical clearance from ground for service-drops over other land traversed by vehicles?
What is the max height of the point of attachment from final grade?
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
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.
Can line and load conductors are permitted in the same raceway or conduit.
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?
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?
What is the maximum service voltage that can be attached directly to a building (except substations or transformer rooms)
How many feet must conduit extend beyond hardscape edge when service conductors are under hardscape?
What is the minimum depth of UG service laterals?
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?
What is the maximum length for an OH temp service drop?
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?
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.
Are hard hats required every time you're outside of your truck?
When can 2 employees work off a single ladder?
What is the maximum allowable metered load?
Mast supports are required if the service attachment point exceeds what height?
Are UG temp ground rods to be installed by the customer inside or outside of the utility easement?
What is the maximum service span for a 4/O service drop?
Service conductors must be in conduit when under hardscape. How many inches must conduit extend past the hardscape edge.
U-guard risers shall be grouped together and shall not occupy more than what percent of the pole?
When shall electrical equipment be considered energized?
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.
Can a stamped brass address tag be on any location of the meter housing?