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Zs, to test or calculate?

A large contractor working on our site have told me yesterday that it is their policy not to live test final circuits where they cannot use a plug? In order to reduce risk, they will now only calculate Zs, on circuits where they would have to open an enclosure, such as FCU's and light fittings.
The control measures we insist are in place, are IP2X equipment, GS38 leads, two man rule with second man having resus training, among others. So I feel the risk has been reduced to as low as reasonably practicable. An d my instinct tells me that a measured Zs reading must be more accurate than a calculated one, since it will include all parallel paths under test.
The contractor is happy to live test distribution circuits, so it seems they want to pick and choose.
They also state that this is how things are now, and have worked at many different sites, Cross Rail, Heathrow, various MOD sites etc, and that they al accept this as common practice.

I like some opinions to find out what's going on out there on other sites. 
Parents
  • The point I made about 2 people is that they are in communication at all times. That is the safety link which appears to be important for proper safety. Safety problems often happen due to lack of communication, a point which is very difficult for H&S people to understand. I am amazed at some of the rules which occur, and the stupidity expected of everyone on site as a complete inability to see dangers themselves. Why would anyone not directly involved in the testing fiddle with anything, particularly open accessory boxes. Very few people are that stupid, and if the painter is about to paint the wall and sees something like this wouldn't he be at least rather careful because putting it back is likely to spoil his work?


    The comment about the 21st century from GK shows a curious view of History Graham. The world in general is probably much safer than it has ever been, and safety awareness is much higher. However the 21st century people have a different problem and that is not having any exposure to dangers growing up now do not understand it, and therefore do the more serious stupid things. All possibilities of accident are given the same value, which is very bad indeed. I have seen a carpenter stopped from using a nail gun, who then seriously damaged his hand by trying to use a hammer. I have suffered the "no ladders" thing on housing sites where a 3 step ladder is ideal for lights. I have been taught to use a pair of steps for two hours when I use one all the time and have done for many years. I have several scaffolding certificates, more days of training. Did I learn anything new, probably not. I have been known to fall out of a tree as a child. I now know how to avoid doing so, or from anything else for that matter. Modern children are simply not allowed to climb trees, so they have no sense of dealing with danger.
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  • The point I made about 2 people is that they are in communication at all times. That is the safety link which appears to be important for proper safety. Safety problems often happen due to lack of communication, a point which is very difficult for H&S people to understand. I am amazed at some of the rules which occur, and the stupidity expected of everyone on site as a complete inability to see dangers themselves. Why would anyone not directly involved in the testing fiddle with anything, particularly open accessory boxes. Very few people are that stupid, and if the painter is about to paint the wall and sees something like this wouldn't he be at least rather careful because putting it back is likely to spoil his work?


    The comment about the 21st century from GK shows a curious view of History Graham. The world in general is probably much safer than it has ever been, and safety awareness is much higher. However the 21st century people have a different problem and that is not having any exposure to dangers growing up now do not understand it, and therefore do the more serious stupid things. All possibilities of accident are given the same value, which is very bad indeed. I have seen a carpenter stopped from using a nail gun, who then seriously damaged his hand by trying to use a hammer. I have suffered the "no ladders" thing on housing sites where a 3 step ladder is ideal for lights. I have been taught to use a pair of steps for two hours when I use one all the time and have done for many years. I have several scaffolding certificates, more days of training. Did I learn anything new, probably not. I have been known to fall out of a tree as a child. I now know how to avoid doing so, or from anything else for that matter. Modern children are simply not allowed to climb trees, so they have no sense of dealing with danger.
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