#1
According to NEC Table 310.16, conductor ampacities are based on this ambient temperature rating
What is 30°C (86°F)?
This NEC term refers to connecting together normally non–current-carrying conductive materials that could become energized
What is bonding?
For this type of electrical distribution beyond the service equipment, it is common practice to install a conduit or raceway.
What is a feeder?
According to the NEC, a panelboard supplied by a feeder is prohibited from being installed in this type of room.
What is a bathroom?
According to the NEC, ground rods must be at least this many feet in length.
What is 8 feet?
This is the VA-per–square-foot value used to compute the general lighting load for a residence under NEC 220.82(B).
What is 3 VA per square foot?
Among the various fuse types with different time-current characteristics, this type is designed not to operate on momentary overloads.
What is a time-delay, dual-element fuse?
These types of loads, connected only phase-to-phase or at 240 volts, are excluded from neutral conductor calculations because they do not carry current on the neutral.
What are 240-volt or phase-to-phase loads?
This type of conductor is not permitted to be smaller than the grounding electrode conductor.
What is the neutral conductor?
copper-clad steel rods are the most common type of ground rods, while this material is not permitted for ground rods.
what are aluminum rods?
These underground conductors run between the utility’s electric transformer and the customer’s meter.
What are service lateral conductors?
This NEC section mandates that overcurrent protection must be provided for each ungrounded conductor.
What is 240.15(A)?
According to NEC 220.61(B), this percent demand factor may be applied to the neutral load of ranges, wall-mounted ovens, counter-mounted cooking units, and electric dryers.
What is 70%?
According to NEC 310.15(B)(2), conductors in raceways or cables exposed to this condition require ampacity correction.
What is direct sunlight?
This rating of a fuse or circuit breaker does not determine the short-circuit rating of the panelboard.
What is the interrupting rating?
According to conductor sizing tables, three conductors of this AWG size have a combined diameter of 0.2886 inches.
What is 3 AWG?
This type of electrode is considered effective without checking for the 25-ohm maximum resistance requirement.
What is a concrete-enclosed electrode?
In a separate building supplied from a main building, these two buses are not connected together.
What are the neutral bus and the equipment grounding bus?
This electrical condition occurs when a hot or ungrounded conductor comes into contact with a grounded surface.
What is a ground fault?
Sizing this conductor only for the normal unbalanced current could make it too small to safely carry fault currents.
What is the neutral conductor?
Under certain NEC conditions, service conductors for 100- to 400-ampere services are permitted to be sized at this percentage of the service rating.
What is 83%?
n series-rated panelboards, this key protection feature is compromised.
What is selectivity?
The unique characteristic of this type of combination panelboard is that the upstream circuit breaker has a high interrupting rating, while the downstream breakers have a low interrupting rating.
What is a series-rated combination?
In a typical residential setting, this conductor connects the system grounded conductor to a grounding electrode or to a point on the grounding electrode system.
What is the grounding electrode conductor?
This condition occurs when the current exceeds what the circuit or connected equipment is designed to safely carry.
What is an overload?