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Under 220.82 B, to the lighting load you must add what va for each 2-wire, 20-amp small appliance and laundry branch circuit
what is 1500
all residential electrical systems in the United States have to be what?
What is grounded systems
Between the serving utility and the service point there is a service drop that comprises this type of conductor
what is overhead
when used as a what, a concrete encased electrode does not have to be supplemented as does a metal underground water piping system
what is grounding electrode
If bare conductors are used with insulated conductors in a raceways or cables their ampacity is limited to ?
what is same as the insulated conductors
In Table 310.16, conductors ampacities are rated at ?
what is 86 F or 30 C
NEC 300.4 states that if what AWG or larger ungrounded circuit conductors enter a cabinet, box enclosure or raceway, an insulating bushing or equivalent must be used
what is 4 Awg
Ground rods must be at least this number of Feet in length
what is 8
The depth of a working space must be no less than
what is 36 inches
A panelboard fed by a feeder shall not be installed ?
what is bathroom, laundry cabinet
When using ground rods, pipes, or plates as grounding electrode, they must be supplemented unless it can be shown that a single grounding electrode has resistance to ground of what?
what is 25 ohms or less
for a feeder, it is common to install conduit or what
what is raceway
Section 220.61 permits the neutral load of ranges, wall mounted ovens, counter mounted cooking units and electric dryers to have a percentage demand factor applied of
what is 70%
Providing a proper ground fault current path helps ensure that certain types of protective devices will operate fast when responding to ground faults. these types include ?
what is overcurrent protective devices
Bonding means normally what electrically conductive materials, that are likely to became energized, shall be connected together
what is non-current carrying
the conductor that is not permitted to be smaller than the grounding electrode conductor is the ?
what is neutral conductor (grounded)
For a one family residence, the minimum size main service disconnecting means is
what is 100 amperes
The neutral bus and the equipment grounding bus in the second building (sub panel) are not to be what
what is not together (bonded)
The most common ground rods are what steel. Rods not permitted are Aluminum
what are copper-clad
The point were the utility,s supply end and the customers premises wiring begins is called what?
what is service point
Service lateral conductors are the underground conductors installed between the utility electric transformer and
what is meter
The General Lighting Load for a residence is generally computed under 220.82 to be what
what is 3 va per square ft
NEC 220.16 permits the neutral load of ranges, wall mounted ovens to have the following percent demand factor applied
what is 70 %
The NEC defines the term service in article 100 as the conductors and equipment connecting the ? to the wiring system of the premises served
what is serving utility
The average ambient summer temperature of a locality is listed by who
The US weather bureau