Earthing Systems Crossword Puzzle

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QUESTIONS LIST: earth : the general mass of ..... is used for a tt system, tt : this system uses an earth electrode, tncs : which system uses a combined earth and neutral conductor?, tns : this system uses the external braid as an earth conductor, electrode : what is the technical term for an earth rod?, terra : this is latin for "earth", pen : these 3 letters represent the combined earth and neutral conductor, building site : a tt system is required by law to supply electricity to this type of installation, combined : this word is represented by the letter "c", separated : this word is represented by the letter "s"