Supported by Bosky Trees

UKTC Archive

tree-care.info for tree advice

RE: Trees and vegetation near electricity lines

Subject: RE: Trees and vegetation near electricity lines
From: WILLIAMS, Tim
Date: Feb 24 2012 12:37:36
______________________________________________________________________
      SPRING 2012 TRAINING FROM QUANTIFIED TREE RISK ASSESSMENT LTD.
   QTRA Licensed User Training - 28 Feb Warwickshire, 13 March Surrey,
           17 April Chorley, 24 April Exeter, 1 May Cambridge.
QTRA Licensed User Update Training - 15 March Surrey, 19 April Chorley.
          A Practitioner's Guide to Visual Tree Risk Assessment     
         29 Feb Warwickshire, 14 March Surrey, 18 April Chorley,
                     25 April Exeter, 2 May Cambridge.
______________________________________________________________________

Electricity companies work to a number of different measurement based on 
voltage.

1) Live zone

2)Vicinity zone



The live zone is the effective distance the electricity can arc around the 
line or apparatus. This distance is based on voltage and is as follows:-



·         Not exceeding 33kV  = 0.8m

·         Not exceeding 66kV = 1m

·         Not exceeding 132kV = 1.4m

·         Not exceeding 275kV = 2.4m

·         Not exceeding 400kV = 3.1

The Vicinity zone is the minimum statutory clearance the electricity company 
must get for safety purposes and is as follows:



·         Not exceeding 1kV = 1m

·         Not exceeding 11kV = 2m

·         Not exceeding 33kV = 2.5m

·         Not exceeding 66kV = 3m

·         Not exceeding 132kV = 3.5m

·         Not exceeding 275kV = 4m

·         Not exceeding 400kV = 5m

However these are the minimum clearances required for safety. The operators 
also have a duty under the electricity continuity of supply regulations to 
ensure supply is maintained. To comply with this and to avoid frequent recuts 
(and associated cost)  they usually try and gain consent for the minimum 
clearance plus an arbitary amount to account for regrowth characteristics and 
speed based on species.



Thanks and Regards

Tim Williams

Senior Tree Officer, Specialist Environmental Services

Cheshire West and Chester Council

Tel: 01244 9(72626)

Email: tim.williams@xxxxxxxxxxxxxxxxxxxxxxx.gov.uk

Location: The Forum, Northgate Street, Chester CH12HS

Visit: cheshirewestandchester.gov.uk



-----Original Message-----
From: Johnston, Paul [mailto:PJohnston@xxxxxxxx.Gov.UK]
Sent: 24 February 2012 12:06
To: UK Tree Care
Subject: RE: Trees and vegetation near electricity lines



______________________________________________________________________

      SPRING 2012 TRAINING FROM QUANTIFIED TREE RISK ASSESSMENT LTD.

   QTRA Licensed User Training - 28 Feb Warwickshire, 13 March Surrey,

           17 April Chorley, 24 April Exeter, 1 May Cambridge.

QTRA Licensed User Update Training - 15 March Surrey, 19 April Chorley.

          A Practitioner's Guide to Visual Tree Risk Assessment

         29 Feb Warwickshire, 14 March Surrey, 18 April Chorley,

                     25 April Exeter, 2 May Cambridge.

______________________________________________________________________



Hi Thomas,



As I recall they were amended (increased distances + several years re-growth) 
a few years back as we experienced trees that had never been in the firing 
line before requiring cutting within the wayleave.



From memory it was to do with making less frequent return visits as much to 
do with H&S (don't have a reference though I'm afraid).



Try the National Grid - they are working under the large HT towers that run 
through our Borough at the moment.



PJ.



Paul Johnston

Principal Tree Officer

Planning & Environment

Fareham Borough Council

www.fareham.gov.uk<http://www.fareham.gov.uk>

(+44)01329 824451





-----Original Message-----

From: TGregory@xxxxxxxxxxx.gov.uk<mailto:TGregory@xxxxxxxxxxx.gov.uk> 
[mailto:TGregory@xxxxxxxxxxx.gov.uk]

Sent: 24 February 2012 09:55

To: UK Tree Care

Subject: Trees and vegetation near electricity lines



______________________________________________________________________

      SPRING 2012 TRAINING FROM QUANTIFIED TREE RISK ASSESSMENT LTD.

   QTRA Licensed User Training - 28 Feb Warwickshire, 13 March Surrey,

           17 April Chorley, 24 April Exeter, 1 May Cambridge.

QTRA Licensed User Update Training - 15 March Surrey, 19 April Chorley.

          A Practitioner's Guide to Visual Tree Risk Assessment

         29 Feb Warwickshire, 14 March Surrey, 18 April Chorley,

                     25 April Exeter, 2 May Cambridge.

______________________________________________________________________



Morning all,





I've been looking up the safe/required clearance from overhead electricity 
lines and I can't find anything that actually states what those distances 
are. I thought it was 1m from low voltage and 3m on high voltage lines but 
this is just from what I've been told in the past and I've never actually 
seen it written down anywhere. Does anyone know where these specifications 
are written, either in legislation or guidance from the National Grid?





Thanks in advance,





Thomas Gregory



Tree Officer







This email and any files transmitted with it are intended solely for the 
addressed individual. The information in this email may be confidential; if 
you have received it in error, please accept our apologies and notify the 
sender as soon as possible, and delete it from your system without 
distributing or copying any information contained within it. Under UK Data 
Protection and Freedom of Information legislation, the contents of this email 
might have to be disclosed in response to a request. We check emails and 
attachments for viruses before they are sent, but you are advised to carry 
out your own virus checks. Winchester City Council cannot accept any 
responsibility for loss or damage caused by viruses.







--

The UK Tree Care mailing list

To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info



If you believe that you have received this message in error, please contact 
postmaster@xxxxxxxx.gov.uk<mailto:postmaster@xxxxxxxx.gov.uk> and include a 
copy of this email.



Communications using this email system may be monitored.







--

The UK Tree Care mailing list

To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info
************************************************************************
Disclaimer:

If you are not the intended recipient of this email (and any attachment), 
please inform the sender by return email and destroy all copies. Unauthorised 
access, use, disclosure, storage or copying is not permitted.
The views expressed by the author do not necessarily reflect the views or 
policies of Cheshire West and Chester Borough Council. The Council cannot 
guarantee that this message or any attachment is virus free or has not been 
intercepted and amended. You should perform your own virus checks.
Cheshire West and Chester Borough Council may monitor emails and as a public 
sector organisation; the Council may disclose this email (or any response to 
it) under the Freedom of Information Act 2000.
Contracts cannot be concluded with the Council nor service effected by email, 
unless otherwise expressly agreed. The contents of this e-mail may be subject 
to privilege.
************************************************************************



-- 
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

Current thread