This course is based on the 2017 national electrical code • There are 5 modules. There is a 10 question quiz at the end of each module and requires an 80% pass rate to advance to the next module
Article 90.4 – Authority having Jurisdiction …The authority having jurisdiction has the responsibility for making interpretaions of the rules, for deciding on the approval of equipment, and for granting the special permission conteplated in a number of the rules.
Article 100- Definitions Readily Accessible – Capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is requisite to actions such as tools(other than keys), to climb over or under, remove obstacles, or resort to portable ladders.
Remember, the definition of an interpretation is the construction of an explanation. • This is why article 100 is so important when interpreting the NEC
Article 100 - definitions • Ampacity- the maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding it’s temperature rating. • See table 310.15(B)(16) : #8 thhn copper conductor has an ampacity of 55 amps, but if the lowest terminal or equipment connection rating is 75 degrees celsius, then the ampacity of the conductor would only be 50 amps due to the “condition of use”.
Article 100- Definitions • In Sight From- Where this code specifies that one equipment shall be ”in sight from” or “within sight from”, or “within sight of”, and so forth, another equipment, the specified equipment is to be visible and not more than 50 feet distant from the other.
Article 100- Definitions • Surge Protection Devices- 4 Types • Type 1: permanently connected SPD’s intended for installation between the secondary of the service transformer and the line side of the service disconnect overcurrent device. • Type 2: permanently connected SPD’s intended for installation between on the load side of the service disconnect overcurrent protective device, including spd’s located at the branch panel. • Type 3: Point of Utilization SPDs
Article 100- Definitions • Selective coordination– localization of an overcurrent protective device to restrict outages to the circuit or equipment affected…
Article 110.14(C) • Temperature limitations- The temperature associated with the ampacity of a conductor shall be selected and coordinated so as to not exceed the lowest temperature rating of any connected termination, conductor, device. Conductors with temperature ratings higher than specified for terminations shall be permitted to be used for ampacity adjustment, correction, or both.
Article 110.16(b) a permanent label, in other than dwelling units, to be applied to service equipment of 1200 amps or more and contain the following language • Nominal system voltage • Available fault current at service overcurrent device • The clearing time of the service overcurrent protective device based on the available fault current at the service equipment • The date the label was applied
Article 110.16(b) (Exception)if label complies with nfpa 70e or other acceptable industry practices, an additional label is not required
Article 110.24 • Available fault current- service equipment in other than dwelling units shall be legibly marked in the field with the available fault current. The field markings shall include the date the fault current calculation was performed and be of sufficient durability to withstand the environment involved.
Article 110.26(A)(2) • Width of working space- the width of the working space in front of the electrical equipment shall be the width of the equipment or 30”, whichever is greater. In all cases, the work space shall permit at least a 90 degree opening of equipment doors and hinged panels.
110.26(A)(3) • Height of working space- The work space shall extend to a height of 6.5 ft or the height of the equipment, whichever is greater. …other equipment that is associated with the electrical installation and is located above or below the electrical equipment shall be permitted to extend not more than 6” beyond the front of the electrical equipment.
Article 110.26(a)(4)- limited accessNew requirements added for equipment above suspended ceilings
Article 110.26(a)(4)- limited accessNew requirements added for equipment in crawl spaces
Article 110.26(C)(3) • (C) Entrance to and egress from working space • (C)(3) Personnel doors- where equipment rated 800 amps or more that contains overcurrent devices, switching devices, or control devices is installed and there is a personnel door(s), intended for entrance to and egress from the working space less than 25 feet from the nearest edge of the working space , the door(s) shall open in the direction of egress and be equipped with panic listed hardware.
Article 110.26(E)(1) Dedicated equipment space, Indoor- the space equal to the width and depth of the equipment and extending from the floor to a height of 6’ above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation. No piping, ducts, leak detection apparatus, or other equipment foreign to the electrical installation shall be located in this zone.