Texas Journeyman Electrician Exam, Feeders and Overcurrent Protection: all 48 questions

All questions from the Feeders and Overcurrent Protection section for Texas Journeyman Electrician Exam, each with the correct answer.

• 3001Which location is prohibited for an OCPD in all three editions?
• 3002When the handle of a circuit breaker is operated vertically, what position must be the on position?
• 3003In the 2026 NEC, what term is used throughout the code in place of the full phrase overcurrent protective device?
• 3004A series combination rating may not be used when motors connected between the two devices contribute more than what percentage of the lower-rated breaker's interrupting rating?
• 3005When may a feeder OCPD be sized at 100 percent of the continuous load?
• 3006In which case is the next size up rule not permitted?
• 3007The available fault current at a panelboard is 18,000 A. Which breaker interrupting rating is acceptable?
• 3008What is the maximum rating of a plug fuse?
• 3009A feeder is protected at 400 A. What is the minimum copper THWN tap conductor at 75 degrees C for a 25 ft tap?
• 3010What is the maximum height of the center of the operating handle of a circuit breaker in its highest position?
• 3011A 400 A feeder OCPD protects a feeder. Field-installed 10 ft tap conductors leave the enclosure. What is the minimum tap ampacity?
• 3012In other than dwelling units, service equipment must be field marked with what information?
• 3013How long must a load run to be considered a continuous load?
• 3014Which of the following is not a standard ampere rating for an inverse time circuit breaker?
• 3015Under the 25 ft feeder tap rule, what minimum ampacity must the tap conductors have?
• 3016In a dwelling unit, in which location are OCPDs prohibited?
• 3017Which situation is an exception to the small conductor rule?
• 3018Transformer secondary conductors not over 25 ft long must have an ampacity of at least what value?
• 3019What must the interrupting rating of a circuit breaker be at least equal to?
• 3020Why may an OCPD panelboard not be installed in a clothes closet?
• 3021What is the maximum OCPD rating for which the next size up rule may be used?
• 3022A feeder supplies 100 A of continuous load and 30 A of noncontinuous load. What is the minimum feeder conductor ampacity before any adjustment?
• 3023What is the role of a supplementary overcurrent protective device?
• 3024Unless specifically permitted elsewhere, what is the maximum OCPD for 12 AWG copper conductors?
• 3025A feeder conductor has an ampacity of 115 A and does not supply receptacles for portable loads. What is the largest standard OCPD permitted under the next size up rule?
• 3026GFPE is required for a feeder disconnect rated 1000 A or more on which system?
• 3027Unless specifically permitted elsewhere, what is the maximum OCPD for 14 AWG copper conductors?
• 3028Three parallel sets of conductors give a total ampacity of 1140 A. What is the largest standard OCPD permitted?
• 3029Which standard OCPD rating comes directly after 800 A?
• 3030A circuit breaker has an interrupting rating other than what value must be marked with that rating?
• 3031When is a 1200 A feeder disconnect on a 480Y/277 volt system not required to have its own GFPE?
• 3032What is the length limit for outside feeder tap conductors that terminate at a single OCPD that is part of or next to the building disconnect?
• 3033Under the 10 ft feeder tap rule, field-installed tap conductors that leave the enclosure must have an ampacity of at least what fraction of the feeder OCPD rating?
• 3035A feeder supplies a continuous load of 160 A only. What is the minimum rating of the feeder OCPD, assuming standard equipment not rated for 100 percent operation?
• 3036In a multi-tenant building, who must have ready access to the OCPDs protecting the conductors supplying a tenant space?
• 3037Arc energy reduction is required where the highest continuous current trip setting of a circuit breaker is at least what value?
• 3039May an OCPD be placed in a grounded conductor?
• 3040Which statement about supplementary OCPDs is correct?
• 3041Unless specifically permitted elsewhere, what is the maximum OCPD for 10 AWG aluminum conductors?
• 3042How must a 25 ft feeder tap terminate?
• 3043What is the general rule for the location of OCPDs?
• 3044A building main disconnect, not the service disconnect, is rated 1200 A on a 480Y/277 volt system. What does the NEC require?
• 3045A 120/240 volt slash rated circuit breaker may be used on which system?
• 3046Where a premises has feeders supplied from more than one nominal voltage system, how must the ungrounded feeder conductors be identified?
• 3047Which value is an additional standard ampere rating for fuses only?
• 3048What does selective coordination of OCPDs achieve?
• 3050Which of the following is a standard ampere rating for fuses and inverse time circuit breakers?
• 3051A circuit breaker used to switch 120 volt fluorescent lighting on a regular basis must be marked with which designation?

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