T&TEC Health, Safety and Environment Rules (Revision 8: 2012) Flashcards

Flashcards covering the definitions, general rules, high voltage apparatus guidelines, and office safety procedures of the Trinidad and Tobago Electricity Commission (T&TEC) Health, Safety and Environment Rules.

Accident

An event preceded by one or more unsafe acts and/or conditions which results in personal injury, property damage or harm to the environment and adversely affects an activity.

Authorised Person

A Competent Person possessing technical knowledge and appointed in writing to issue and cancel Control Permits to Work, Control Permits to Test, Permits to Work, Permits to Test, and Limitation of Access.

Circuit Main Earth

An earth applied at the request and direction of the Shift Control Engineer/Operator between the point of work and any potential Source of Supply.

Confined Space

A space where dangerous dust or fumes may accumulate or an oxygen deficiency may occur due to construction, location, or contents, and which has severe restrictions for movement.

Contact Area

The area within $1.0\,m$ of the nearest energised high-voltage line or equipment while carrying out Live Line Work.

De-energised

The condition of an apparatus or line that has been disconnected from all sources of electrical energy and its voltage brought to zero.

Earthed

Connected to the general mass of earth in such a manner to ensure an immediate discharge of electrical energy without danger; for apparatus, it means all phases are short circuited and connected to ground.

High Voltage Apparatus

Any apparatus, equipment or conductor which is normally operated at a voltage exceeding $650\,volts$.

Inclement Weather

Conditions characterized as stormy, rainy, or misty.

Island

A condition when at least two parts of the Transmission and Sub-transmission System operate independently with their own voltage and frequency.

Isolated

A physical disconnection following de-energising, which includes the physical removal of disconnecting means and Lockout/Tagout where applicable.

Job Hazard Analysis (JHA)

A process consisting of job planning, execution, and closeout recorded on an approved form to identify potential accidents and specify control measures.

Live Line Tools and Equipment

Insulated tools and equipment, including gloves, sleeves, and non-conductive ropes, used for Live Line Work operations.

Low Voltage Apparatus

Any apparatus, equipment or conductor operated at a voltage not exceeding $250\,volts$.

Medium Voltage Apparatus

Any apparatus, equipment or conductor operated at a voltage exceeding $250\,volts$ but not exceeding $650\,volts$.

Near Miss

An unintended, unplanned, or unexpected event that could have, but did not, result in personal injury or property damage.

Priority Apparatus

Apparatus operated at $12\,kV$ and below that can be inadvertently used to interconnect two islands.

Shall

A word used in the safety rules to indicate a mandatory requirement that must be obeyed as written.

Source of Supply

The point from which equipment or apparatus can be supplied with electrical energy, such as switches, transformers, or standby generators.

Spur Line

An electrical circuit that is energised from only one source and contains no line crossings.

Tailboard Conference

A meeting at the start of work, conducted by the On Site Supervisor, to discuss the scope of work, procedures, and safety precautions; also known as toolbox meetings.

Workplace Violence

Any act in which a person is abused, threatened, intimidated, or assaulted in his employment, including harassment and physical attacks.

Safety Helmet Requirement

Protective equipment that must be worn so as to offer protection to the head and forehead and must not be worn backwards.

Insulated Glove Testing Frequency

Electrical protective gloves must be tested electrically every period of $6\,months$ or when their condition is in doubt.

Straight Ladder Positioning

Ladders must be positioned at an angle of approximately $75^\circ$, which follows a $1:4$ ratio.

Class B Fire Extinguishing Agents

For fires involve oil, grease, and other flammable liquids, dry powder, carbon dioxide ($CO_2$) gas, or foam should be used.

Grounding Cross-Sectional Area

An earth lead attached to a tower or driven earth must have a minimum conductance equivalent to that of $0.645\,cm^2$ copper.

Minimum Clearance for $33\,kV$

The minimum clearance from the nearest exposed conductor to ground level or a platform in a live substation for voltages not exceeding $33\,kV$ is $2.7\,m$.

Minimum Clearance for $220\,kV$

The minimum clearance from the nearest exposed conductor to ground level or a platform in a live substation for voltages between $132\,kV$ and $220\,kV$ is $5.4\,m$.

Directional Antenna RF Safe Distance

Personnel working near the front emitting surface of a directional antenna must stay at least $2.4\,m$ ($8\,ft$) away.

Noise Exposure Limit

Hearing protection must be worn whenever noise levels exceed an $80\,dB$ Time Weighted Average (TWA).

Office Footwear Rule

Shoes must be close-toed with a heel support strap, and heels must not exceed a height of $7.5\,cm$.

Earthquake Safety Position

During an earthquake, employees should drop to their knees, sit with the upper torso bent forward, clasp hands behind their heads, and close their eyes.

Hot Work

Any work operation producing open flames, hot slag, sparks, or arcs and sufficient heat to serve as a source of ignition.