MP Power Ltd has jointly developed a Constant Pressure Sensing Microbore tool - otherwise known as a Resistograph - with UKPN to test the integrity of wooden utility poles, timber built constructions and all types of Trees. 

It has proven to be reliable, trusted and cost effective, we believe our Resistograph and evidence based Residual Strength Calculator (RSV), developed entirely for all UK Networks, it is unique and unrivalled. 

Method: After completing an on-site risk assessment our trained field staff will drill in twelve places on each pole - four times at three different levels: 1.2m, 0-05m, and below ground at a 45 degree angle. 

The resistograph uses a 3mm drill bit that can extend to 400mm enabling it to test the largest of poles, the drill bit rotates clockwise into the pole and retracts anti-clockwise leaving the wood fibres intact and therefore is deemed as a non intrusive/non destructed test.  In addition, it can drill below ground without the need to excavate, further ensuring safety and efficiency. 

The motor force or amplitude required for the drill to penetrate the wood is recorded against the distance travelled, this provides a comprehensive set of data and an 'at a glance' view of the inside of the pole where suspect or rotting wood is clearly depicted, data which informs this output and a residual strength calculation which offers a clear and auditable assessment of the integrity of the pole, defects and likelihood of a failure. 

The graphs are then electronically transferred to our office team who then calculate the RSV and a pass or fail result is given. 

The RSV calculator is unrivalled in its development and assurance, It was developed by Newcastle University using data provided by wood pole suppliers in the UK and specific details of the UK OHL construction methods, enabling it to accurately give each pole an individual RSV, Factor and Safety and a Breaking Load. 

The Resistograh drills have proven that they are crucially an opinion-less and non-subjective device