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Questions and Answers
In the optional calculation for additional load in existing dwellings, what is the demand factor for the first 8 kVa of all loads?
In the optional calculation for additional load in existing dwellings, what is the demand factor for the first 8 kVa of all loads?
How long should hallways be to require at least one receptacle outlet?
How long should hallways be to require at least one receptacle outlet?
Where should the receptacle be located in relation to heating, air conditioning, and refrigeration equipment?
Where should the receptacle be located in relation to heating, air conditioning, and refrigeration equipment?
What is the maximum horizontal distance permitted from the outlet to any point along the floor line in wall spaces of specified rooms?
What is the maximum horizontal distance permitted from the outlet to any point along the floor line in wall spaces of specified rooms?
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What is the unit load per square meter in volt-amperes for hospitals?
What is the unit load per square meter in volt-amperes for hospitals?
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What is the considered load in volt-amperes for an outlet with heavy-duty lampholders?
What is the considered load in volt-amperes for an outlet with heavy-duty lampholders?
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What is the minimum size requirement for open individual conductors up to 600 volts nominal over a span more than 15 meters?
What is the minimum size requirement for open individual conductors up to 600 volts nominal over a span more than 15 meters?
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What is the minimum size requirement for open individual conductors for over 600 volts nominal?
What is the minimum size requirement for open individual conductors for over 600 volts nominal?
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What is the required separation distance for conductors on poles not placed on racks or brackets?
What is the required separation distance for conductors on poles not placed on racks or brackets?
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How far should open conductors be separated from open conductors of other circuits or systems?
How far should open conductors be separated from open conductors of other circuits or systems?
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What is the vertical clearance required for conductors from the roof surface?
What is the vertical clearance required for conductors from the roof surface?
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What is the minimum number of GFCI receptacles required for a one-family or two-family dwelling unit?
What is the minimum number of GFCI receptacles required for a one-family or two-family dwelling unit?
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What is the feeder demand factor for five household clothes dryers according to the standard load calculations?
What is the feeder demand factor for five household clothes dryers according to the standard load calculations?
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When load is completed on a volt-amperes-per-square-meter basis, how should the load be distributed among multioutlet branch circuits within panelboards?
When load is completed on a volt-amperes-per-square-meter basis, how should the load be distributed among multioutlet branch circuits within panelboards?
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For over 600 volts nominal, what is the minimum cable size required in copper?
For over 600 volts nominal, what is the minimum cable size required in copper?
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In what situation would there be no reduction in the size of the neutral conductor according to the text?
In what situation would there be no reduction in the size of the neutral conductor according to the text?
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When should each system ungrounded conductor be identified by separate color coding or marking tape?
When should each system ungrounded conductor be identified by separate color coding or marking tape?
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What is the requirement for receptacles near kitchen sinks to serve counter top surfaces?
What is the requirement for receptacles near kitchen sinks to serve counter top surfaces?
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How is the feeder load computed for each two-wire small appliance branch circuit in a dwelling unit?
How is the feeder load computed for each two-wire small appliance branch circuit in a dwelling unit?
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What is the required minimum ampacity for tap conductors on branch circuits rated less than 40 amperes?
What is the required minimum ampacity for tap conductors on branch circuits rated less than 40 amperes?
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What is the minimum branch circuit rating for ranges of 8.75 kw or more?
What is the minimum branch circuit rating for ranges of 8.75 kw or more?
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What is the ampacity requirement for ungrounded conductors in a one-family dwelling with an initial net computed load of 10kVA or more?
What is the ampacity requirement for ungrounded conductors in a one-family dwelling with an initial net computed load of 10kVA or more?
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What is the rating requirement for a branch circuit serving continuous loads such as store lighting?
What is the rating requirement for a branch circuit serving continuous loads such as store lighting?
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What is the minimum size for overhead conductors for festoon lightning?
What is the minimum size for overhead conductors for festoon lightning?
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In a dwelling unit, how close should appliance outlets for specific appliances be installed from the intended location of the appliance?
In a dwelling unit, how close should appliance outlets for specific appliances be installed from the intended location of the appliance?
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What is required for constructing sites in terms of boxes for splices or junction connections?
What is required for constructing sites in terms of boxes for splices or junction connections?
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How many 20-amp circuits does the code require for the kitchen small appliance load in dwelling occupancies?
How many 20-amp circuits does the code require for the kitchen small appliance load in dwelling occupancies?
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In hallways of 3000 mm or more in length, how many receptacles are required?
In hallways of 3000 mm or more in length, how many receptacles are required?
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What is the maximum demand factor allowed for appliance loads in dwelling units when sizing a feeder?
What is the maximum demand factor allowed for appliance loads in dwelling units when sizing a feeder?
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Study Notes
Calculating Loads
- For the first 8 kVA of all loads, the demand factor is 100%, and for the remainder, it is 40%.
- For hospitals, the demand factor for the first 50,000 volt-ampere load is 40%.
- For non-dwelling receptacle loads, the demand factor is 100% for the first 10 kVA or less, and 50% for the remainder over 10 kVA.
Outlets and Receptacles
- Receptacles shall be installed so that no point along the floor line in any wall space is more than 1800 mm, measured horizontally from the outlet in that space.
- In every kitchen, family room, dining room, living room, or similar room or area, receptacles shall be installed to meet the 1800 mm requirement.
- For hallways of 3000 mm or more in length, at least one receptacle outlet shall be required.
- The receptacle shall be located on the same level and within 7600 mm of the heating, air conditioning, and refrigeration equipment.
Load Calculations
- The unit load per square meter in volt-amperes of dwelling units, schools, and stores is 24, except for hospitals.
- An outlet for heavy-duty lampholders shall be considered as a load of not less than 600 volt-amperes based on nominal branch circuit voltage.
- Using the optional calculation for additional loads in existing dwelling units, the demand factor for the first 8 kVA of load shall be 100%, and the remainder of load at 40%.
Branch Circuits
- Multioutlet circuits rated 15 or 20 amperes can supply fixed appliances (utilization equipment fastened in place) as long as the fixed appliances do not exceed 50% of the circuit rating.
- For branch circuits rated less than 40 amperes, tap conductors shall have an ampacity not less than 15 amperes.
- For ranges of 8.75 kW or more, the minimum branch circuit rating shall be 40 amperes.
- The rating of a branch circuit serving continuous loads such as store lighting and similar loads shall not be less than the non-continuous load plus 125% of the continuous load.
Conductors and Wiring
- Up to 600 volts nominal, open individual conductors shall not be smaller than 8 mm2 copper, or 14 mm2 aluminum for a span more than 15 meters.
- For over 600 volts nominal, open individual conductors shall not be smaller than 14 mm2 copper, or 22 mm2 aluminum.
- Conductors on poles shall have a separation of not less than 300 mm where not placed on racks or brackets.
- Open conductors shall be separated from open conductors of other circuits or systems by not less than 100 mm.
Grounding and GFCI Protection
- Receptacles and cord connectors having grounding terminals must have those terminals effectively grounded.
- All 125-V or 250-V single-phase, 15-A or 20-A receptacles installed within 1800 mm of a kitchen sink to serve counter-top surfaces should have ground-fault circuit-interrupter protection for personnel.
- GFCI protection for personnel is required for all 125-V, single-phase, 15- and 20-ampere receptacles installed in a dwelling unit garage.
Additional Requirements
- A minimum of two GFCI receptacles shall be located outdoors for a one-family or two-family dwelling unit.
- Each system ungrounded conductor, wherever accessible, shall be identified by separate color coding, marking tape, tagging, or other equally effective means.
- The recommended maximum total voltage drop on both the feeders and branch circuits is 5%.
- Direct grade level access is defined as being located not more than 2000 mm above the grade level and being readily accessible.
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Description
Test your knowledge on specific regulations for electrical wiring, including optional calculations for additional load in dwellings, requirements for hallway receptacle outlets, and proximity of receptacles to heating equipment.
