ICC Residential Electrical 2021 Study Questions E1 with
Verified Answers
1. Residential Electrical Scope Limited to 120/240 volt, 0-400 ampere, sin-
E3401.2 gle phase systems in one and two family
dwellings and accessory structures.
2. Residential Electrical Limita- Does not cover Installations, including as-
tions E3401.3 sociated lighting, under the exclusive con-
trol of communications utilities and electric
utilities, or services over 400 amperes.
3. Integrity of electrical equip- Internal parts of electrical equipment, in-
ment E3404.7 cluding busbars, wiring terminals, insula-
tors, and other surfaces shall not be dam-
aged or contaminated by foreign materi-
als such as PAINT, plaster, cleaners, abra-
sives, and corrosive residues.
4. Working clearances E3405 36 inches deep, 30 inches wide, and floor to
6.5 feet with minimum 90 degree opening
doors
5. Panelboards and Service Shall not be located in bathrooms, toilet
Equipment Locations 3405.5 rooms, clothes closets, or over the steps of
a stairway.
6. Minimum size of conductors 14 AWG copper and 12 AWG aluminum or
E3406 copper clad aluminum.
7. Length of conductor for splice minimum 6 inches of free conductor or 3
or termination 3406.11.3 inches outside of each opening.
8. Tightening torque values are provided by the manufacturer to be
E3406.12 achieved by approved means (torque
wrench, torque screwdriver) indicated in
inch pounds.
9. Methods not permitted for con- connection devices or fittings that depend
nections E3406.14.2 soley on solder shall not be used.
10. Grounded Conductor Identifi- Neutrals: continuous white or gray outer fin-
cation E3407 ish or three continuous white or gray stripes
, ICC Residential Electrical 2021 Study Questions E1 with
Verified Answers
along it or at terminations, on any other
sheathing color except green insulation.
11. Festoon Lighting NEC 225.6 A sting of outdoor lights that are suspend-
ed between 2 points. Shall not be smaller
than 12 AWG unless the conductors are
supported by messenger wires and across
spans not more than 40 feet without mes-
senger wires.
12. Ceiling-supported paddle fans independently
shall be supported of the E4101.6
outlet box
13. Above-ground service-en- Schedule 80 or rigid metal conduit, inter-
trance cables subject to phys- mediate conduit, electrical metallic tubing,
ical damage shall be protected or other approved means.
by Schedule PVC conduit E3605.5
14. Conductors in NM cable as- 90
semblies shall be rated at E3705.4
degrees Celsius
15. Underground service laterals warning ribbon
that are not encased in con- E3803.2
crete and that are buried 18
inches or more below grade
shall have their location iden-
tified by a
.
16. There shall be a wall switch at 6
each floor to control stairway E3903.3
lighting where the stairway has
or more risers.
17. Nonmetallic boxes shall be True/Accurate
used only with cable wiring E3905.3
methods with entirely non-
Verified Answers
1. Residential Electrical Scope Limited to 120/240 volt, 0-400 ampere, sin-
E3401.2 gle phase systems in one and two family
dwellings and accessory structures.
2. Residential Electrical Limita- Does not cover Installations, including as-
tions E3401.3 sociated lighting, under the exclusive con-
trol of communications utilities and electric
utilities, or services over 400 amperes.
3. Integrity of electrical equip- Internal parts of electrical equipment, in-
ment E3404.7 cluding busbars, wiring terminals, insula-
tors, and other surfaces shall not be dam-
aged or contaminated by foreign materi-
als such as PAINT, plaster, cleaners, abra-
sives, and corrosive residues.
4. Working clearances E3405 36 inches deep, 30 inches wide, and floor to
6.5 feet with minimum 90 degree opening
doors
5. Panelboards and Service Shall not be located in bathrooms, toilet
Equipment Locations 3405.5 rooms, clothes closets, or over the steps of
a stairway.
6. Minimum size of conductors 14 AWG copper and 12 AWG aluminum or
E3406 copper clad aluminum.
7. Length of conductor for splice minimum 6 inches of free conductor or 3
or termination 3406.11.3 inches outside of each opening.
8. Tightening torque values are provided by the manufacturer to be
E3406.12 achieved by approved means (torque
wrench, torque screwdriver) indicated in
inch pounds.
9. Methods not permitted for con- connection devices or fittings that depend
nections E3406.14.2 soley on solder shall not be used.
10. Grounded Conductor Identifi- Neutrals: continuous white or gray outer fin-
cation E3407 ish or three continuous white or gray stripes
, ICC Residential Electrical 2021 Study Questions E1 with
Verified Answers
along it or at terminations, on any other
sheathing color except green insulation.
11. Festoon Lighting NEC 225.6 A sting of outdoor lights that are suspend-
ed between 2 points. Shall not be smaller
than 12 AWG unless the conductors are
supported by messenger wires and across
spans not more than 40 feet without mes-
senger wires.
12. Ceiling-supported paddle fans independently
shall be supported of the E4101.6
outlet box
13. Above-ground service-en- Schedule 80 or rigid metal conduit, inter-
trance cables subject to phys- mediate conduit, electrical metallic tubing,
ical damage shall be protected or other approved means.
by Schedule PVC conduit E3605.5
14. Conductors in NM cable as- 90
semblies shall be rated at E3705.4
degrees Celsius
15. Underground service laterals warning ribbon
that are not encased in con- E3803.2
crete and that are buried 18
inches or more below grade
shall have their location iden-
tified by a
.
16. There shall be a wall switch at 6
each floor to control stairway E3903.3
lighting where the stairway has
or more risers.
17. Nonmetallic boxes shall be True/Accurate
used only with cable wiring E3905.3
methods with entirely non-
