NEC 2020 Questions and Answers |
Latest Version | 2024/2025 | Correct &
Verified
What is the minimum required height for overhead service conductors above a residential
driveway?
✔✔12 feet
What is the minimum ampacity required for the service entrance conductors in a single-family
dwelling?
✔✔100 amps
What is the minimum burial depth for underground PVC conduit in a residential setting?
✔✔18 inches
What is the required spacing for securing nonmetallic-sheathed cable?
✔✔4.5 feet
What is the maximum allowable voltage drop for branch circuits in a dwelling unit?
1
,✔✔3%
What type of protection is required for receptacles installed in garages?
✔✔GFCI
What is the minimum required distance between a receptacle and a sink in a kitchen?
✔✔24 inches
What is the maximum distance between receptacles in a residential living room?
✔✔12 feet
What is the minimum conductor size allowed for a grounding electrode conductor connected to a
rod electrode?
✔✔6 AWG
What is the required height for mounting a disconnect switch in a residential installation?
✔✔6 feet 7 inches
2
,What is the minimum spacing required between kitchen countertop receptacles?
✔✔4 feet
What is the maximum length of a flexible cord used for a dishwasher?
✔✔6 feet
What is the minimum size of a junction box for three 12 AWG conductors?
✔✔4 cubic inches
What is the minimum clearance for overhead conductors crossing a flat roof?
✔✔8 feet
What type of protection is required for outlets installed outdoors?
✔✔Weatherproof covers and GFCI
What is the maximum overcurrent protection allowed for a 14 AWG conductor?
✔✔15 amps
3
, What is the minimum required clearance in front of a 200-amp service panel?
✔✔36 inches
What is the required voltage rating for general-purpose residential outlets?
✔✔120 volts
What is the minimum size grounding electrode conductor required for a 200-amp service?
✔✔4 AWG
What is the maximum allowable length for an equipment grounding conductor in flexible
conduit?
✔✔6 feet
What is the required ampacity of a conductor supplying a 40-amp electric range?
✔✔40 amps
What is the required separation between metallic boxes and combustible materials?
✔✔1/4 inch
4
Latest Version | 2024/2025 | Correct &
Verified
What is the minimum required height for overhead service conductors above a residential
driveway?
✔✔12 feet
What is the minimum ampacity required for the service entrance conductors in a single-family
dwelling?
✔✔100 amps
What is the minimum burial depth for underground PVC conduit in a residential setting?
✔✔18 inches
What is the required spacing for securing nonmetallic-sheathed cable?
✔✔4.5 feet
What is the maximum allowable voltage drop for branch circuits in a dwelling unit?
1
,✔✔3%
What type of protection is required for receptacles installed in garages?
✔✔GFCI
What is the minimum required distance between a receptacle and a sink in a kitchen?
✔✔24 inches
What is the maximum distance between receptacles in a residential living room?
✔✔12 feet
What is the minimum conductor size allowed for a grounding electrode conductor connected to a
rod electrode?
✔✔6 AWG
What is the required height for mounting a disconnect switch in a residential installation?
✔✔6 feet 7 inches
2
,What is the minimum spacing required between kitchen countertop receptacles?
✔✔4 feet
What is the maximum length of a flexible cord used for a dishwasher?
✔✔6 feet
What is the minimum size of a junction box for three 12 AWG conductors?
✔✔4 cubic inches
What is the minimum clearance for overhead conductors crossing a flat roof?
✔✔8 feet
What type of protection is required for outlets installed outdoors?
✔✔Weatherproof covers and GFCI
What is the maximum overcurrent protection allowed for a 14 AWG conductor?
✔✔15 amps
3
, What is the minimum required clearance in front of a 200-amp service panel?
✔✔36 inches
What is the required voltage rating for general-purpose residential outlets?
✔✔120 volts
What is the minimum size grounding electrode conductor required for a 200-amp service?
✔✔4 AWG
What is the maximum allowable length for an equipment grounding conductor in flexible
conduit?
✔✔6 feet
What is the required ampacity of a conductor supplying a 40-amp electric range?
✔✔40 amps
What is the required separation between metallic boxes and combustible materials?
✔✔1/4 inch
4
