Structures and HV lines

There certainly are for 25kVAC overhead power lines on railways. Her Majesty's Stationery Office retails a publication on the subject.

Nope they are not different. The intent and literal wording of 36-110 is to ensure that when HV conductors are isolated by virtue of height, the minimum height required is as per Table 34.

In the case of a building under a HV line, that minimum space "starts" at the top of the structure under the HV conductor and not at the ground beside it.

If you live in Victoria Australia.

The guidelines can be found on Energy Safe Victoria

http://www.esv.vic.gov.au/LinkClick.aspx?fileticket=wNTd5JG%2fhw4%3d&tabid=56&mid=416

If you are in the USA, the required separation varies by state, but you can safely assume that the numbers in this article are absolute minimums:

http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10826

Hi all,

Obviously there is a case usually regulated not in industrial standards but in laws or legal reglaments. Therefore even the results must be of the same order, each country, state, city, etc can have different requirements.

Hera are those for Spain as an example:

HV lines are clasified into 3 categories:

• Category 1: Higher than 132 kV
• Category 2: from 30 to 66 kV
• Category 3: from 3 to 20 kV

The law indicates that categories 1 and 2 lines should not pass over urban zones unless specific appoval.

In the case there are no other solution (once approved) the minimum distance from line to buildings are:

• If lines could be accesed by people: Distance (m) = Nominal voltage (kV)/100 plus 3,3 m (minimum 5 m)
• If lines are not accesible to people: Distance (m) = Nominal voltage (kV)/150 plus 3,3 m (minimum 4 m).

So in your example, for 330 kV the most unfavorable case results in 6,6m

In the USA the National Electrical Safety Code, (not NEC) governs the constrction of all medium voltage, & high voltage distribution and transmission lines,and substations. This includes all clearances required. Most states have adopted this code.