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RE: Trees and vegetation near electricity lines

Subject: RE: Trees and vegetation near electricity lines
From: WILLIAMS, Tim
Date: Feb 24 2012 13:33:18
______________________________________________________________________
      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.
______________________________________________________________________

I believe the letter of the law would only allow automatic exemption for the 
minimum clearance and not the extra growth, however I think it also comes 
down to some common sense and what is reasonable. If there is already a 
historic element ie the tree was previously pruned to give e.g 4m clearance 
then it would be appropriate to allow the regrowth to be cut back to the same 
point. On a maiden tree there is still an element of what is appropriate ie 
will pruning change the overall character of the tree if so then an 
application maybe in order if not and overall amenity value not significantly 
detracted from then perhaps no application would be required.

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: TGregory@xxxxxxxxxxx.gov.uk [mailto:TGregory@xxxxxxxxxxx.gov.uk] 
Sent: 24 February 2012 13:11
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.
______________________________________________________________________

Thanks for this Gents,

Regarding the additional clearance over the minimum statutory clearance (x 
years growth for example), at what point would Tree Officers consider work 
not to be exempt and therefore require an application for tree works. I'm 
refering now to trees which are protected either by a TPO or located within a 
conservation area.

See Mynors 23.7.2
        'In relation to trees on the operations land of a statutory land
of a statutory  undertaker, the 1969 Model Order provides that consent
is not required for the         cutting down, etc., of a protected tree:
where the cutting down, topping or      lopping is for the purpose of
securing safety in the operation of the         undertaking.'

By maintaining the minimal statutory clearances, would that be considered to 
be what is allowed under this exemption? Or could they maintain that minimum 
statutory clearance plus 3 years growth for example? Or does that given them 
the freedom to do more or less what ever they like?

Thanks again in advance,

Thomas Gregory
Tree Officer


-----Original Message-----
From: WILLIAMS, Tim [mailto:Tim.Williams@xxxxxxxxxxxxxxxxxxxxxxx.gov.uk]
Sent: 24 February 2012 12:37
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.
______________________________________________________________________

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







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