COD E IN F O C U S BY CHARLES R. MILLER
The second or last article in Chapter 1
is Article 110, Requirements for Electrical
Installations. As stated in 110.1, it covers
general requirements for the examina-
tion and approval, installation and use,
access to and spaces about electrical
conductors and equipment; enclosures
intended for personnel entry; and tunnel
installations. While this scope mentions
quite a few things covered in Article 110,
it does not come close to mentioning
everything covered in the article.
Last month’s column covered the
arc flash hazard warning requirements
in 110.16. The next section also uses a
term that was used in 110.16 but not in
the same way. Section 110.16 covers arc
flash hazard warnings, and 110.18 covers
arcing parts. If parts of electrical equipment in ordinary operation produce
arcs, sparks, flames or molten metal,
they shall be enclosed or separated and
isolated from all combustible material.
An informational note under 110.18
instructs the Code user to see Articles
500 through 517 for hazardous (
classified) locations and Section 430.14 for
Requirements, Part XII
ALL OF THE FIRST EIGHT CHAPTERS in the National Electrical Code (NEC)
contain at least five articles except one. Chapter 1, General, contains only two articles.
The first, Article 100, contains definitions essential to the proper application of the
NEC. As stated in the scope of Article 100, it is not intended to include commonly
defined general terms or commonly defined technical terms from related codes and
standards. If a term is used in two or more articles, the term is defined in Article 100.
If a term is only used in one article, the definition will be included in the article in
which it is used, but the term still may be referenced in Article 100.
FIGURE 1 MANUFACTURER’S MARKINGS
Section 110.21(A) requires a name or some type of marking on all electrical equipment. Other sections throughout the Code require
additional information such as voltage, current and wattage to be marked on the electrical equipment.
In accordance with 110.21(A), all electrical equipment shall have a marking or label that contains the manufacturer’s name, trademark or
other descriptive marking by which the organization responsible for the product can be identified.
Some of the items required to be marked on a motor include manufacturer’s name, rated volts, rated full-load current, rated frequency and
number of phases if an AC motor, rated full-load speed, rated temperature rise or the insulation system class and rated ambient temperature,
time rating, rated horsepower if 1/8 hp or more, code letter or locked-rotor amperes if an AC motor rated 1/2 hp or more, and design letter for
design B, C or D motors [430.7(A)].
Marking to show this motor is thermally protected
H.P. 1. 5 R.P.M. 3450 S.F. 1. 15
VOLTS 208-230 HZ 60 PH 1
AMPS 9. 6-8. 8 AMB 40 ∞C
NEMA DESIGN B FRAME Y56Y
INSUL CLASS B
Lebanon, TN U.S.A.
THERMALLY PROTECTED KA AC MOTOR
Manufacturer’s name Insulation system class