puwer said:
Acer,
Have you written a risk assessment looking at the use of a top handled saw for the operation you intend?
The PUWER regs are some of your red tape in this case, REG 4 suitability of work equipment does state that employers shall ensure that work equipment is used only for operations for which, and under conditions for which, it is suitable.
In this regulation "suitable" means suitable in any respect which it is resonably foreseeable will affect the health or safety of any person.
If you belive that the top handled saw is the best equipment to use then you will obviously have to put the work in to prove this, personally i think you would struggle even with a very indepth RA and supporting safe system of work, i can already begin to think of the counter arguements against it. Especially when you look at suitable control measures for a highlighted hazard and the risk level.
I'm sure I could make a good case for using a top handled saw over a rear handled one of the same weight (If just weight were the issue, I'm sure the H&S solution would be to run out and spend another £500 on a rear handled version of the 020, even though I have a perfectly good 020T sitting in my workshop!). In fact, I believe that this very specific job would be safer when using a top handled saw - my issue is that I would still be hammered regardless, whatever risk assessment I had done (see nohope's comments previously). For this job, I am forced to use a tool that is less safe by legislation that is supposed to protect my safety!
. The discussion is below, so if anyone is bored with this already, then stop reading now!
The issue with top handled saws is less ability to maintain control in the event of a kickback cf, a rear handled saw, even if the saw is being held with both hands (although I would like to know how many people injure themselves with a top handled saw when holding them properly with two hands cf. one hand only). In the situation I'm thinking of, the kickback risk is low - and lower if I were using a top handled saw compared to a rear handled saw of similar weight. At the level I am cutting at, the only things to kick back from would be stake tops spaced at 18". Kickback would occur if I hit one of those stakes or another part of the hedge with the kickback zone of the bar nose, and this would probably happened if I stumbled during the operation, if I lost concentration and misjudged the position of the bar, or if my control was reduced through, say, fatigue. The first two would be equally likely whatever saw I was using, the last would be more likely with a rear handled saw. In the position I am using the saw, at around chest height, arm fatigue sets in quickly, especially the left arm. A light saw reduces this problem, but a light top handled design is even better, because the design of the top handle allows the right hand to make more of a contribution to supporting the weight of the saw. Try holding a 020T in your right hand at chest height with the top handle, then try it again with an 020 (rear handled version of 020T), holding the saw with the rear handle, right hand only. Which is easier? Not that you'd use it like this, I'm just saying that you can support the weight of the top handled saw with both hands rather than mainly with the left hand, so the saw is more comfortable to use in this situation. Also, you can stand a little closer to the work when using a top handled design, as there is no rear handle in the way. The saw is nearer to the body, reducing arm fatigue and also reducing lower back stress (and, incidentally, improving chances of controlling a kickback). Because of these factors, the risk of kickback through reduced control due to fatigue is lower. So, even if the consequences of a kickback with a top handled saw were more severe, the chance of the kickback happening in the first place would be lower than with a similar rear handled saw.
Then, we can consider the control measures; safety devices fitted to the saw (ie inertia activated chain brake), and positioning of body parts out of the path of a kickback - it would be hard to do this particular job standing in the kickback danger area. If we did have a kickback, it is very likely that the chain would be stopped, providing that the inertia chain brake were functioning properly, and that the chain would not make contact with body parts anyway.
Kickback aside, there are other health hazards involved here, and I've explained about arm fatigue. Pain & discomfort in the arms and hands are precursors to more long term work related upper limb disorders. I can recover from pain by stopping work for a bit and changing my posture, but a condition such as tendonitis or carpal tunnel syndrome is more permanent. Although more long term and less dramatic than a kickback cut or amputation, it is still a risk that needs to be assessed and controlled, and here I believe the top handled saw wins out.
Finally, there is always the possibility of using a manual tool, such as a silky saw. If I did this, I would need to support the stake or top of the hedge to stop it moving, so I am putting my left hand into the danger area straight
away. A cut from a silky can be quite severe - not as severe as a chainsaw cut could be, but, in this situation, a lot more likely. When we assess risk, we often regard it as the chance of something happening X severity of consequences. Using a hand saw here, I'd say the chance of a cut is a lot higher than when using a chainsaw (both hands on the chainsaw, of course!), but the consequences are less severe, assuming no life threatening infection follows. With the chainsaw, lower likelihood X greater severity. So which is riskiest? Myself, I'd say risk is lower with the chainsaw; after each day's chainsaw use, I have, so far remained unscathed, but I have cut myself several times when using a pruning saw (I'm not the only one - there's a whole thread dedicated to this somewhere) But again, this judgement is subjective.
Mind you, perhaps, using the hand tool is the way forward. If I used hand tools, everything would take 10 times as long, and I would eventually go out of business. If I'm out of work, I cannot have an accident at work. Mission accomplished, HSE!!