Texas Journeyman Industrial Electrician

Mandatory rules use 'shall' or 'shall not' to identify required or prohibited actions, while permissive rules use 'shall be permitted' or 'shall not be required.'

Mandatory text is enforceable, while informational notes are included for informational purposes only and are not enforceable as requirements of the Code (e.g., the 3% and 5% voltage-drop figures).

Chapters 1 through 4 apply generally to all installations, while Chapters 5, 6, and 7 apply to special occupancies, special equipment, or other special conditions.

Chapter 8 covers communications systems and is not subject to the requirements of Chapters 1 through 7 except where specifically referenced in Chapter 8.

Class I locations involve flammable gases or vapors (Division 1 = ignitible concentrations can exist under normal operating conditions), while Class II locations involve combustible dusts.

Class II dusts form ignitible suspensions in air, while Class III easily ignitible fibers/flyings are not normally suspended in air in sufficient quantity but can collect on machinery or lighting and be ignited.

Branch-circuit and feeder conductors must be sized at noncontinuous load plus 125% of continuous load, while conductors from generator output terminals to the first overcurrent device must be at least 115% of the generator nameplate current rating.

Conductors for a single continuous-duty motor are sized at 125% of the table full-load current, while an inverse-time breaker may be set at 250% of FLC for a single-phase motor and increased for starting to a maximum of 400% of FLC for currents of 100 A or less.

For general motor applications, 430.6(A)(1) requires the table values — not the nameplate values — to be used to determine conductor ampacity; nameplate rating is used for overload protection sizing.

Conductors must be at least 125% of the rated-load current, while the branch-circuit protective device must not exceed 175% of RLA (next higher standard size permitted by Exception No. 1, up to 225% of RLA under Exception No. 2 if needed to carry starting current).

Table 250.122 sizes equipment grounding conductors by overcurrent device rating for general equipment, while 250.122(E) governs flexible cords, requiring the EGC to be not smaller than 18 AWG copper and not smaller than the circuit conductors when the largest circuit conductor is 10 AWG or smaller.

The informational note recommends feeders be sized to prevent a voltage drop exceeding 3% at the farthest outlet, with maximum total voltage drop on both feeders and branch circuits not exceeding 5%; both are recommendations, not requirements.

Type SOW is a 600-volt extra-hard-usage cord suitable for damp and wet locations ('W' suffix), while SPT-2 is a lightweight parallel thermoplastic cord (not permitted in show windows/showcases), SJ is junior hard-service for damp locations, and SV is a not-hard-usage vacuum cleaner cord.

Per Table 400.50, Type SH is a single conductor cable rated 2001–25,000 volts, while Type SC is single conductor rated 2001–5000 volts and Type G is multiconductor rated 2001–5000 volts.