Professional Electricians in Stretford

Correctly designed and installed earth electrode systems are essential for the correct operation of equipment and to ensure the safety of peopleThe effects of touch and step potentials can be dangerous to people and livestock tooAccurately designed earthing systems ensure that the safe voltage limits (defined by the duration of the fault and the local ground covering) are not exceeded

Touch potential is the voltage between conductive parts when touched simultaneously; either between hands, or between hands and feetAn example of this would be a person touching metalwork, such as a metallic fence whilst their feet are in contact with the ground beneath, at the same time that an electrical fault or lightning strike occurs; and is discharged into the earthing system

Transferred potential is the voltage rise of an earthing system caused by an external fault transferred to the earthing system by a connected means such as cable sheaths, metallic pipework etc.

Surge protection devices perform two functions; they divert partial lightning currents and limit transient overvoltagesBoth can be as a result of lightning activity

Surge protection devices should be inspected and tested as part of the overall lightning protection inspection and testing regimeLow voltage power SPDs should also be inspected as part of the periodic inspection and testing requirements of BS 7671