High-Voltage Electrical Installations

High Voltage Electrical Installations

Unlike a low voltage installation which is generally designed and constructed in accordance with technically prescriptive requirements, most high voltage installations are unique to their application and are designed according to electrical engineering safety principles. As a result, the Regulations that apply set fundamental safety requirements only.

High Voltage Electrical Installations


High voltage installations require planned ongoing maintenance and are often designed as a part of or closely interact with the supply or distribution of electricity. As a result, the Regulations implement explicitly a number of measures that apply the same principles and practices across the supply systems/installations interface.


Reflecting the engineered installation philosophy, the Regulations achieve control through identifying the factors that need to be addressed during design and construction and by defining characteristics that are considered to be unsafe.


Step by step safety requirements for high voltage installations:

High voltage installations require a certified design.


Design

General safety requirements as explained in Regulation 14

Construction

Technical rules: Safety requirements relating to overhead lines, earthing systems, isolation from supply of electricity, conductors and notices (Reg 41 to 46).

Certification is required

Connection

Inspection: All high voltage installations are subject to testing (Reg 38) and third party inspection (Reg 70 to 72)

Safety check as explained in Regulation 73(4)

Periodic verification

In service safety verification as explained in Regulation 41(1)(2)

Defining unsafe works and installations

Regulation 20 defines electrically unsafe works and installations. Works and installations are unsafe if:

  • the characteristics of any fittings are impaired
  • the connections are not secure and reliable
  • cooling conditions are impaired
  • there is a risk of ignition (e.g. fittings subject to high temperature are unguarded)

In addition, measures must be put in place to do at least one of the following:

  • prevent accidental contact with exposed parts
  • provide automatic disconnection of power if a fault arises that would cause injury
  • prevent or limit (International Electrotechnical Commission shock current Standards) electric current passing through the body of a person on contact of any part of the works or installations.

Periodic verification

There is a requirement to implement a safety checking system (Regulation 40) that must:

  • verify compliance with all the requirements
  • occur periodically at reasonable intervals
  • ensure records of results are being kept. 

Design, construction and inspection of high voltage electrical installations

Regulations for the design, construction and inspection of high voltage electrical installations take into account the fact that each installation will be different, and are designed according to electrical engineering safety principles.

Post a Comment

0 Comments