This Is Referring To Electrical Wiring Residential 18th Edition Book Chapter 1 Questions #2 A To B Help Me Please

This Is Referring To Electrical Wiring Residential 18th Edition Book 
Chapter 1 Questions #2 A To B Help Me Please

Transcribed Text:

Question: This is referring to Electrical Wiring Residential 18th edition book…

this is referring to Electrical Wiring Residential 18th edition book
chapter 1 questions #2. to B help me please

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Expert Answer

Anonymous answered this

Purpose of Specifications:

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‘Speccifications provide the information about what you are using. Specifications include type ,quality of the
parts and size,

In electrical specification includes manufacturer’s name electrical parts and catalog number for items
listing which ensure tthat items will be correct size ,desire quality and electriacl rating.


‘Most elctrical code sections used when installing armoured cables listed below. This not intended to be an
inclusive list. Al local electrical codes and standards must be reviewed prior too and during eletrical

‘These are some clectical codes listed below

+ NEC 645 – Information Technology Equipment

+ NEC 250.118 – Types of Equipment Grounding Conductors

+ NEC 300,22(C) – Other Spaces Used for Environmental Air (Plenums)

+ NEC 530 – Motion Picture and Television Studios and Similar Locations

+ NEC 210.4(8) – Multiwire Branch Circuit – Disconnecting Means

+ NEC 392 – Cable Trays

+ NEC Table 310.15(8)(3){a) – Adjustment Factors for More Than Three Current-Carrying Conductors in a
Raceway or Cable

+ NEC 310.10 – Locations (A) Dry Locations, (B) Dry and Damp Locations, (C) Wet Locations

+ NEC 330 – Metal-Clad Cable: Type MC

+ NEC 320 – Armored Cable: Type AC

+ NEC 517 – Health Care Facilities

+ NEC 518 – Assembly Occupancies

+ NEC Table 310.15(8)16 – Allowable Ampacities of Insulated Conductors rated up to and including 2000V

+ NEC 500 – Hazardous (Classified) Locations, Classes I I, and Ill, Division 1 and 2

+ NEC 760 – Fire Alarm Systems

B) The Code recognizes many wiring methods for use in buildings. These wiring methods fall into several
main categories:

1) Raceways
a)Cable trays

‘Some of the wiring methods have very specific applications, while others can be used in a greater variety
of conditions.

There are some general rules common to many of the methods. These provisions should be understood
before beginning any wiring installation. A brief look at these general provisions follows:

11) Whether in cable or as single individual units, conductors should be used within the voltage and
temperature range for which they are designed.

2) Normally, single conductors may only be installed as part of a wiring method recognized by the Code.
Thus, routing individual conductors without the protection or support of an approved wiring method is
strictly prohibited.

3) Fora circuit, the current-carrying conductors, neutral conductor (where used), and equipment grounding
conductor must all be run within the same conduit, cable, duct, tray, or enclosure. Failure to comply with
this requirement could lead to inductance problems.

4) Circuits of different voltage may be run in the same raceways or occupy the same spaces (enclosures,
equipment) providing that the voltage is less than 600 volts and the conductors each have insulation
ratings greater than or equal to that of the circuit with the highest voltage rating, For example, conductors
rated for 300 volts can be run in the same raceway as conductors rated for 600 volts as long as the
maximum circuit voltage is 300 volts.

5) Measures must be taken to protect conductors against physical damage. When running cable through
bored holes in framing members, the edge of the hole should be 1 1/4″ away from the nearest edge of the
member. If a cable or raceway is placed along notches made in wood framing members, the notches must
be protected from nails and screws by using a metal plate .

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