Definitions Applicable to Section 1 Through 10

DOE-HDBK-1092-2004

Voltage of a circuit not effectively grounded--The term means the voltage between any two

conductors. If one circuit is directly connected to and supplied from another circuit of higher

voltage (as in the case of an autotransformer), both are considered as of the higher voltage,

unless the circuit of lower voltage is effectively grounded, in which case its voltage is not

determined by the circuit of higher voltage. Direct connection implies electric connection as

distinguished from connection merely through electromagnetic or electrostatic induction.

DEFINITIONS APPLICABLE TO SECTIONS 1 THROUGH 10

Bay--One vertical 19" wide segment of a rack cabinet. Several bays can be joined together to

form a large rack cabinet.

Code of record--The code in effect at the time of design or installation. Unless required to

correct a known hazard or a major modification is being performed, installations in compliance

with the code of record, do not need to be upgrade to a later edition of the code unless so stated

in the code.

Controlled access--If the chassis are screwed into the rack cabinet. Doors having latches can

be taken to mean the circuitry is controlled. Control of the access to the area in which the tester

is located is also a means of control. In this case the area must be identified.

Electroexplosive device--An explosive device detonated by an integral electrical component

upon application of a specified voltage/current pulse to that component.

Electromagnetic (EMR) field--Time varying distribution in some medium of electric and

magnetic forces.

Electromagnetic radiation--Emission of electromagnetic energy from an electrical source in a

portion of the radio frequency spectrum which may pose a threat to electroexplosive devices.

Emergency-shutdown pushbutton (E-stop)--A control device provided to automatically stop

electrical energy to devices in the area during an emergency.

Failsafe--Built-in safety characteristics of a unit or system so that a failure (of the unit or

system) or a loss of control power will not result in an unsafe condition.

Failsafe--Built-in safety characteristics of a unit or system so that unit or system failure or a loss

of control power will not result in an unsafe condition.

General access area--An area that does not present hazards to personnel while equipment and

systems are functioning normally. These areas are accessible to all personnel.

Grounding hook--A device for making a temporary connection to discharge and ground the

internal energy sources in hazardous electrical equipment. It consists of a bare copper rod

shaped like a shepherd's hook at one end, an insulating handle, and a suitable bare flexible

copper cable securely connected at the other end, and can be securely connected to an

equipment or building ground.

Interlocked access areas--Areas in which the sources of power must be interlocked with the

access doors because of the hazards the areas contain.

B-37