E

A lamp which produces light when electric current flows through a vapor or a gas;may be designated by the gas filling which is responsible for the major part of the radiation (e.g.,mercury lamp,neon lamp, etc.),by the physical dimensions or operating parameters (e.g.,short-arc lamp,high pressure lamp,etc.),or by its application (e.g., black-light  lamp,bactericidal lamp, etc.).

The qualifying adjectives electricandelectricalhave the following meanings:containing,producing,arising from, actuated by,or related to electricity.In general,electricis used when the term being qualified designates something that has the properties,dimensions,or physical characteristics associated with electricity;electricalis used when the term being qualified does not explicitly designate something that has the properties,dimensions,or physical characteristics of electricity (e.g.,electrical engineering).However,some times these two terms are used interchange ably.

A measure of the ability of a material to conduct electric current.

Same as conduit.

The curing of concrete by the use of electrical heaters.

A material that is a very poor conductor of electricity.

A component or device made from material having great enough resistance to the flow of electric current to be effectively considered as a nonconductor of current.

Conduit,usually fabricated of steel,which encloses electrical wiring,thereby protecting the wiring from outside damage.The difference between electrical metallic conduit and electrical metallic tubing (EMT) is that conduit is heavy walled and usually has threaded ends;in contrast,tubing is thinner and is not threaded.Between these two is an intermediate metallic conduit (IMC),which is 25 percent lighter and less costly than EMT;it may be threaded or threadless.

A thin walled metal raceway having a circular cross section;used to pull in or withdraw electric cables or wires after the tubing is installed in place;uses connectors and couplings other than the threaded type.

A round,corrugated plastic tube that is concealed in concrete,or it may be concealed in a ceiling construction having a fire rating of at least15 minutes,provided the ceiling is not used as a plenum for return air.

Vitrified whiteware having an electrical insulating function.

The physical property of a device,conductor,element,branch,or system,by virtue of which power is lost as heat when current flows through it;the physical property which an electric conductor exhibits to the flow of current;measured in ohms.

The resistance,in ohms,of an electric conductor of unit cross-sectional area and unit length.

Obsolete term for lightning rod.

See service connection.

See friction tape,thermoplastic insulating tape,thermoplastic protective tape.

Descriptive of an electric wiring system which utilizes the flow of a small current in the circuit (too small to actuate the apparatus being supplied) to energize an alarm signal upon failure of any device or equipment in the circuit.

A device which measures and registers the integral of an electric quantity with respect to time,e.g.,a watt-hour meter.

The science of transforming acoustical energy into electric energy and vice versa,e.g.,by means of microphones or loud speakers.

Same as gal vanic corrosion.

See copperlight glazing. 

1.In arc welding, the component in a welding circuit through which an electric current is conducted between the electrode holder and the arc.2.In resistance welding,the component through which the electric current in the welding machine passes (usually accompaniedby pressure) directly to the work.
 

A domestic hot water heater that is heated by an electric current flowing through enclosed electrodes submerged in the water tank.Also see instantaneous-type water heater.

Galvanizing by a process in which the zinc is deposited by an electroplating method.

A method of gas metalarc welding or flux cored arc welding in which an external gas is supplied; for welding in a vertical position,the molding weld is confined by “welding shoes.”

A support for an electrically operated luminaire,esp.one that hangs,as a chandelier.

The emission of light from a phosphor excited by electromagnetic energy.

A lamp in the form of a thin sheet,either rigid or flexible,which generates light by electroluminescence;characterized by low luminance and efficacy.

The decomposition of a chemical compound into its constituent parts by the passage of an electric current;this action leads to the decomposition of metals.

Copper that has been refined by electrolytic deposition;used for manufacture of tough pitch copper and copper alloys. 

In the transmission or reception of communication signals,the interference caused by the radiation of electromagnetic fields.

The force which causes (or tends to cause) the movement of electricity in a conductor;the difference in potential between the terminals of an electric source.

Said of a metal surface having a thin electrochemical deposit of a metal such as brass,zinc,copper,cadmium,tin,or nickel;the metal deposit usually is the result of its immersion in an electrolytic bath.

A device installed in flues,and the like,to prevent smoke and dust particles from escaping to the atmosphere;the particles are given an electric charge as they pass through a charged screen;then they are attracted to one of two electrically charged plates through which they pass;from time to time they are removed from the plates.

An educational institution which offers instruction usually from the first year through the sixth or eighth year of schooling.

A long cylindrical tube with a hopper like top;used as a chute for concrete in placing the concrete in deep shafts or forms;the tube is kept filled with concrete,so that there is no free fall of material and resultant segregation of its constituents is avoided.
 

See Tudor Revival. 

1.A secondary wing or extension of a building at right angles to its principal dimension.2.Same as elbow.
 

A stair which winds about a solid elliptic newel or elliptically shaped well. 

Abbr.for “end matched.”

Having the margin broken by a notch or notches.

A crenelated molding. 

Same as battlement. 

See  reinforcement.

1.The crenels or intervals between the merlons of a battlement.2.An enlargement of a door or window opening,at the inside face of the wall,by means of splayed sides.
 

See electric metallic conduit.

Lighting designed to supply illumination which is essential to safety in the event of failure of the normal electric power supply.

See standby power generator.

On a door,a safety device other than a panic exit device which permits egress under emergency conditions.

A system designed and maintained to assure necessary exit illumination in the event of failure of the normal lighting in the building.