VOLTAGE DROP
voltage drop equation is derived from this basic equation
ohm's law
a load that is expected to operate for 3 hours or more is called this
continuous load
Table 314.16(A) gives dimensions for standard size_______?
metal boxes
how much box volume allowance does a 10 AWG ground pigtail take up?
0
the difference between the value of the source voltage and the load voltage
voltage drop
the amount of current a conductor can carry is named this
AMPACITY
derating is done to prevent overheating and premature failure of a conductors what?
insulation
Conduit bodies that contain splices require __________ on the conduit body.
volume markings
In a single family dwelling, what is the service feeder rating (amps) for a 1/0 Cu conductor
175A
Voltage drop is recommended not to exceed ____ for branch circuits
3%
upsizing current carrying conductors for voltage drop also requires upsizing this as well
Ground, EGC
computers, TVs, led drivers, as well as fluorescent electronic ballasts are considered this
non-linear loads
an octagon box containing a stud and a hickey will have how many additional conductors added to the volume
2
what is the minimum box volume for (4) 10 AWG THHN CU conductors
10 in. ^3
In the voltage drop equation, a single phase equation multiplies the length by 2. three phase multiplies the length by ___
1.73 or square root of 3
If using 90 deg column on table 310.16, what else must you make sure is also rated for at least 90 deg in the circuit?
Terminals I.E. breakers, stak ons, crimps, and lugs
Having 7-9 current carrying conductors in a raceway will require you to derate by this amount?
70%
A 4-square box with two receptacles installed adds __________ additional conductors to the fill allowance?
4
What is the ampacity for (4) 6 AWG THHW Cu installed in a wet location
52A
Voltage drop is proportional to the____ of conductor
resistance (length)
this rule sets MAXIMUM overcurrent protection limits for common small copper wires (14,12,10 AWG) to prevent overheating , overriding standard ampacity tables.
small conductor rule
the adjustment factor for more than 30 current carrying conductors in a metal wireway
40%
to size a pull box for straight pulls, you need to multiply the largest raceway by what?
8
what is the ampacity of (6) 12-2 MC going through sheetrock with no spacing between wires and has been caulked?
15A