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My second McGraw-Hill book for electricians, Troubleshooting and Repairing Commercial Electrical Equipment, now available from Amazon --






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Electrician's Guide to electronic, telecom and computer definitions --


Accessible (as applied to equipment) - Admitting close approach; not guarded by locked doors, elevation, or other effective means. (NEC)

Accessible (as applied to wiring methods) - Capable of being removed or exposed without damaging the building structure or finish or not permanently closed in by the structure or finish of the building. (NEC)

Accessible, Readily (Readily Accessible) - Capable of being reached quickly for operation, renewal or inspections without requiring those to whom ready access is requisite to climb over or remove obsticals or resort to portable ladders, and so forth. (NEC)

Al/Cu - Suitable for either aluminum or copper terminations.

Alternating current - A flow of electrons that reverses direction at a constant rate, usually sine wave, sometimes square wave.

Ampacity - The current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. (NEC)

Appliance - Utilization equipment, generally other than industrial, that is normally built in standardized sizes or types and is installed or connected as a unit to perform one or more functions such as clothes washing, air conditioning, food mixing, deep frying, and so forth. (NEC)

Approved - Acceptable to the authority having juristiction. (NEC)

Arc Fault Circuit Interrupter - A protective device that opens a circuit in response to parallel or series arcing downstream.

Askarel - A generic term for a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media. Askarels of various compositional types are used. Under arcing conditions, the gases produced, while consisting predominantly of noncombustible hydrogen chloride, can include varying amounts of combustible gases, depending on the askarel type. (NEC)

Attachment plug (plug cap) (plug) - A device that, by insertion in a receptacle, establishes a connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle. (NEC)

Attenuation - Power loss in transmission lines, usually expressed in decibels.

Attenuator - A device designed to intentionally reduce the level of a signal.

Authority having jurisdiction - The organization, office, or individual responsible for approving equipment, materials, an installation, or a procedure. (NEC)

Automatic - Self acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current, pressure, temperature, or mechanical configuaration. (NEC)

Ballast - A device that steps up voltage for fluorescent lighting, also found in arc welders.

Bandwidth - Capacity to transmit information. A higher bandwidth translates to faster speed.

Bathroom - An area including a basin with one or more of the following: a toilet, a tub, or a shower. (NEC)

Bonding (Bonded) - The permanent joinging of metallic parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed. (NEC)

Bonding jumper - A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected. (NEC) (P)Bonding jumper, Equipment - The connection between two or more portions of the equipment grounding conductor. (NEC)

Bonding jumper, Main - The connection between the grounded circuit conductor and the equpment grounding conductor at the service. (NEC)

Bonding jumper, System - The connection between the grounded circuit conductor and the equipment grounding conductor at a seperately derived system. (NEC)

Branch circuit - The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s). (NEC)

Branch circuit, Appliance - A branch circuit that supplies energy to one or more outlets to which appliances are to be connected and that has no permanently connected luminaires that are not part of an appliance. (NEC)

Branch circuit, General-purpose - A branch circuit that supplies two or more receptacles or outlets for lighting and appliances. (NEC)

Branch circuit, Individual - A branch circuit that supplies only one utilization equipment.(NEC)

Branch circuit, Multiwire - A branch circuit that consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system. (NEC)

Building - A structure that stands alone or that is cut off from adjoining structures by firewalls with all openings therein protected by approved fire doors.

Cable - A single stranded insulated conductor or two or more stranded or solid insulated conductors within a common jacket.

Cable assembly - A cable with connectors on one or both ends.

Campus - A group of buildings associated by function or ownership, such as a college campus or corporate facility.

Cascade cable - A cable connecting hubs or other compatible computer hardware.

Capacitor - A device consisting of two conducting electrode plates separated by a dielectric material. It offers less impedance at higher frequencies and can store an electric charge.

Circuit breaker - An overcurrent device that opens (interrupts) a circuit at a predetermined current level. Like a fuse, but capable of being reset.

Ping - A system administrator's tool used to see if a computer is operating and also to see if network connections are intact. Using the Internet Control Message Protocol (ICMP) Echo function, a small packet is sent through the network to any given IP address. The packet contains 64 bytes, 56 data bytes and 8 bytes of protocol reader information. The computer that sent the packet then waits for a return packet. If the connections are good and the target computer is up, a good return packet will be received. PING can also tell the user the number of connections between two computers and the amount of time it takes for a packet to make the round trip.



Books for electricians --

Here is a selection of the most significant electricians' books available online today, at the best prices around. Clicking on any logo provides access to reviews and ratings by electricians. A good place to start is with the 2008 NEC Handbook, which contains the complete text of the current code plus extensive commentary, diagrams and illustrations. Other books of interest for the electrician are available as well.

Low Voltage, Telecom, Fire Alarm Books --


HOME | Best Web Host | Question of the Week | Archived Questions | More Archived NEC Questions | Still More Archived Questions | Still More Archived Questions-2 | Still More Archived Questions-3 | Articles | Electrical Deficiencies | More Electrical Deficiencies | Electricians Tools | Online computers | Cybercorner | Electrician's License | Electronics Tutorials | Electricians' worksaving ideas | Electronic Theorems | Satellite Dish | Digital Cameras and Equipment | HTML Color Chart | Electronic Acronyms | Electronic Definitions | Electrician's Soldering Tutorial | Photovoltaic Power | Wind Power | Fire Alarm Basics | More Fire Alarm Info | Working with MC and EMT | Electricians' Color Code | Wiring Commercial Garages | Managing Your Emergency Lights | Lighting Design | Industrial Wiring | Wiring Ethernet | Residential Wiring | Low Voltage Wiring | PLC Overview | Electrical Troubleshooting Techniques | Using Loop Impedance Meter | Ten Common Grounding Errors |NEC and Low-Voltage Wiring | Raceway Protection and NEC | Working with Metal Raceway | Inductance and Characteristic Impedance | Understanding Capacitance | History of the Ethernet | Twisting Data Conductors | NEC Article 800, Communications Circuits | NEC Article 810, Radio and Television Equipment | NEC Article 820, Community Antenna and Radio Distribution Equipment | NEC Article 830, Network-Powered Broadband | Troubleshooting Submersible Well Pumps | Wiring Healthcare Facilities | First Edition National Electrical Code 1897 | Books for Electricians | Links


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