Exposed Conductive Part

Exposed Conductive Part

Definition(s)

Exposed Conductive Part

conductive part which can readily be touched and which is not normally alive, but which may become alive under fault conditions Note 1 to entry: Typical exposed conductive parts are walls of enclosures, operating handles, etc. [SOURCE: IEC 60050-441:1984, 441.11.10]. Source: IEC 61892-6, Mobile and fixed offshore units – Electrical installations – Part 6: Installation, Third Edition, December  2013. Global Standards  

Exposed Conductive Part

conductive part not forming a part of the electrical installation and liable to introduce an electric potential, generally the potential of a local earth [SOURCE: IEC 60050-195:1998, 195.06.11] Source: IEC 61892-6, Mobile and fixed offshore units – Electrical installations – Part 6: Installation, Third Edition, December  2013. Global Standards

Exposed Conductive Part

Conductive part which can readily be touched and which is not normally alive, but which may become alive under fault conditions. NOTE Typical exposed conductive parts are walls of enclosures, operating handles, etc. Source: IEC 61892-6, Mobile and fixed offshore units – Electrical installations – Part 6: Installation. Global Standards  

Exposed Conductive Part

Conductive part which can readily be touched and which may become alive under fault conditions. NOTE Typical exposed conductive parts are walls of enclosures, operating handles, etc. Source: IEC 61892-7, Mobile and fixed offshore units – Electrical installations – Part 7: Hazardous areas. Global Standards  
Equipotential Bonding

Equipotential Bonding

Definition(s)

Equipotential Bonding

provision of electric connections between conductive parts, intended to achieve equipotentiallity [SOURCE: IEC 60050-195:1998, 195.01.10]. Source: IEC 61892-6, Mobile and fixed offshore units – Electrical installations – Part 6: Installation, Third Edition, December  2013. Global Standards

Equipotential Bonding

Electrical connection putting various exposed conductive parts and extraneous conductive parts at a substantially equal potential. Source: IEC 61892-6, Mobile and fixed offshore units – Electrical installations – Part 6: Installation. Global Standards
Electric Surface Heating System

Electric Surface Heating System

Definition(s)

Electric Surface Heating System

System of electric surface heating devices together with any controls, thermal insulation and protective cladding designed to meet a specified electric surface heating requirement. Source: IEC 61892-6, Mobile and fixed offshore units – Electrical installations – Part 6: Installation. Global Standards  
Electric Surface Heating

Electric Surface Heating

Definition(s)

Electric Surface Heating

Heat generated in the surface layer of a body to be heated by electrical means in order to raise or maintain its temperature. Source: IEC 61892-6, Mobile and fixed offshore units – Electrical installations – Part 6: Installation. Global Standards  
Bonding

Bonding

Definition(s)

Bonding

An electrical connection between two electrically conductive objects that is intended to significantly reduce potential differences.

Source: API RP 545 Recommended Practice for Lightning Protection of Aboveground Storage Tanks for Flammable or Combustible Liquids, First Edition, October 2009. Global Standards

Bonding

Connection of non-current-carrying parts to ensure continuity of electrical connection, or to equalize the potential between parts. Source: IEC 61892-6, Mobile and fixed offshore units – Electrical installations – Part 6: Installation. Global Standards
Appropriate Authority

Appropriate Authority

Definition(s)

Appropriate Authority

Governmental body and/or classification society with whose rules a unit is required to comply. Source: IEC 61892-6, Mobile and fixed offshore units – Electrical installations – Part 6: Installation. Global Standards Source: IEC 61892-7, Mobile and fixed offshore units – Electrical installations – Part 7: Hazardous areas. Global Standards  

Appropriate Authority

In this section, “appropriate authority” means
  1. with respect to a navigable water, the Minister of Transport; and
  2. [Repealed, 1996, c. 10, s. 239]
  3. with respect to any other facility, the Board.
Source: National Energy Board Act, R.S.C., 1985, c. N-7, Canada, current to April 29, 2013. Legislation  

Appropriate Authority

In this section and sections 110 and 111, “appropriate authority” means
  1. with respect to a navigable water, the Minister of Transport, and
  2. [Repealed, 1996, c. 10, s. 244]
  3. with respect to any other utility, the Board; autorité compétente.
Source: National Energy Board Act, R.S.C., 1985, c. N-7, Canada, current to April 29, 2013. Legislation
Type of Protection

Type of Protection

Definition(s)

Type of Protection

See protection, type of.

Source: API Recommended Practice 14FZ, Recommended Practice for Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class I, Zone 0, Zone 1, and Zone 2 Locations, Second Edition, May 2013. Global Standards

Type of Protection (Miscellaneous)

Measures applied in the construction of electrical equipment to prevent ignition of the surrounding explosive atmosphere by such apparatus (see 4.1.2). Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Special Tool

Special Tool

Definition(s)

Special Tool (Miscellaneous)

Tool required to gain access to, or to adjust, controls. The design of the tool is intended to discourage unauthorised interference with the apparatus. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Nominal Supply Voltage

Nominal Supply Voltage

Definition(s)

Nominal Supply Voltage (Miscellaneous)

Voltage that is given by manufacturers as the recommended operating voltage of their gas detection apparatus. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Warm-Up Time

Warm-Up Time

Definition(s)

Warm-Up Time (not applicable to spot-reading apparatus) (times)

Time interval, with the apparatus in a stated atmosphere, between the time when the apparatus is switched on and the time when the indication reaches and remains within the stated tolerances (see Figures 1 and 2). Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Time of Response

Time of Response

Definition(s)

Time of Response, t(x), (not applicable to spot-reading apparatus) (times)

Time interval, with the apparatus in a warmed-up condition, between the time when an instantaneous change between clean air and the standard test gas, or vice versa, is produced at the apparatus inlet, and the time when the response reaches a stated percentage (x) of the stabilised signal on the standard test gas. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Stabilisation

Stabilisation

Definition(s)

Stabilisation (Times)

State when three successive readings of an apparatus, taken at 2 min intervals, indicates no changes greater than ±1 % of the measuring range. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Minimum Time of Operation

Minimum Time of Operation

Definition(s)

Minimum Time of Operation (Spot-Reading Apparatus) (Times)

Time interval between the initiation of a measurement procedure and the time when the apparatus indication reaches a stated percentage of the final indication. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Final Indication

Final Indication

Definition(s)

Final Indication (Times)

Indication given by the apparatus after stabilisation. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Special State

Special State

Definition(s)

Special State (Signals and Alarms)

All states of the apparatus other than those in which monitoring of gas concentration takes place, for example warm-up, calibration mode or fault condition. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Latching Alarm

Latching Alarm

Definition(s)

Latching Alarm (Signals and Alarms)

Alarm that, once activated, requires deliberate action to be deactivated. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Fault Signal

Fault Signal

Definition(s)

Fault Signal (Signals and Alarms)

Audible, visible or other type of output, different from the alarm signal, permitting, directly or indirectly, a warning or indication that the apparatus is not working satisfactorily. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Alarm Set Point

Alarm Set Point

Definition(s)

Alarm Set Point (signals and alarms)

Fixed or adjustable setting of the apparatus that is intended to preset the level of concentration at which the apparatus will automatically initiate an indication, alarm or other output function. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  

Alarm Setpoint

Alarm setpoint is a fixed or adjustable setting at which the system will automatically indicate an alarm. The FSS Code, chapter 16, limits the maximum alarm setpoint to the equivalent of 30% of the lower flammable limit. Source: IMO MSC.1/Circ.1370, Guidelines for the design, construction and testing of fixed hydrocarbon gas detection systems, 22 June 2010, International Maritime Organization. Regulatory Guidance
Sampling Probe

Sampling Probe

Definition(s)

Sampling Probe (Supply of Gas to Instrument)

Separate sample line, which is attached to the apparatus as required, that may or may not be supplied with the apparatus. It is usually short (e.g. in the order of 1 m) and rigid (although it may be telescopic), but it may be connected by a flexible tube to the apparatus. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Sample Line

Sample Line

Definition(s)

Sample Line (Supply of Gas to Instrument)

A means by which the gas being sampled is conveyed to the sensor including accessories, e.g. filter, water trap. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Sensor

Sensor

Definition(s)

Sensor

Instrument used to measure operating information such as pressure, flow or temperature. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

Sensor (Types of Instruments)

Assembly in which the sensing element is housed and that may also contain associated circuit components. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  

Sensor

Sensor means any unit external to the S-VDR, to which the S-VDR is connected and from which it obtains data to be recorded. Source: IMO Resolution MSC.163(78), Recommendation on Performance Standards for Shipborne Simplified Voyage Data Recorders (S-VDRs), 17 May 2004, International Maritime Organization. Regulatory Guidance
Remote Sensor

Remote Sensor

Definition(s)

Remote Sensor (Types of Instruments)

Sensor that is not integral to the main body of the apparatus. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Stand-Alone Control Unit

Stand-Alone Control Unit

Definition(s)

Stand-Alone Control Unit (Types of Instruments)

Fixed gas detection control units intended to provide meter indication, alarm functions, output contacts and/or alarm signal outputs when utilized with stand-alone gas detection apparatus. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Stand-Alone Gas Detection Apparatus

Stand-Alone Gas Detection Apparatus

Definition(s)

Stand-Alone Gas Detection Apparatus (Types of Instruments)

Fixed gas detection apparatus that provide a conditioned electronic signal or output indication to a generally accepted industry standard (such as 4-20 mA or 3-15 psi), intended to be utilized with stand-alone control units or signal processing data acquisition, central monitoring and similar systems, which typically process information from various locations and sources including, but not limited to gas detection apparatus. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Transportable Apparatus

Transportable Apparatus

Definition(s)

Transportable Apparatus (Types of Instruments)

Apparatus not intended to be portable but which can be readily moved from one place to another. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Spot-Reading Apparatus

Spot-Reading Apparatus

Definition(s)

Spot-Reading Apparatus (Types of Instruments)

Apparatus intended to be used for short, intermittent or irregular periods of time as required (typically 5 min or less). Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards
Portable Apparatus

Portable Apparatus

Definition(s)

Portable Apparatus (Types of Instruments)

Spot-reading or continuous duty apparatus that has been designed to be readily carried from place to place and to be used while it is being carried. A portable apparatus is battery powered and includes, but is not limited to a) a hand-held apparatus, typically less than 1 kg, which requires use of only one hand to operate, b) personal monitors, similar in size and mass to the hand-held apparatus, that are continuously operating (but not necessarily continuously sensing) while they are attached to the user, and c) larger apparatus that can be operated by the user while it is carried either by hand, by a shoulder strap or carrying harness and which may or may not have a hand directed probe. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Group II Apparatus

Group II Apparatus

Definition(s)

Group II Apparatus (Types of Instruments)

Apparatus for places with a potentially explosive atmosphere, other than mines susceptible to firedamp. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Group I Apparatus

Group I Apparatus

Definition(s)

Group I Apparatus (Types of Instruments)

Apparatus for mines susceptible to firedamp. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards  
Fixed Apparatus

Fixed Apparatus

Definition(s)

Fixed Apparatus (Types of Instruments)

Apparatus that is intended to have all parts permanently installed. Source: IEC 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases. Global Standards