Well, there are a few reasons why you do both, clip and tie or two apposing binas. Yes, it is a work cover thingy and also an insurance requirement.
Two points of attachment are better than one. If the bina comes undone, and yes, this has happened many times, then there is the potential for the climber falling and injury will occur. Two points of attachemnt of course means that if one fails, there is a back up.
13yrs ago, gyms only cliped into the rope using one bina,however over the years it has become necessary for gyms to have two attachments. Through out Australia, there are the two systems, and both are fine. In Melbourne it is the practise to use clip and tie, thats the choice of the gyms, in NSW it seems to be two binas and again thats the choice of the gyms. Either are ok to use.
Insurance companies want two connections, its betterr to be safe than sorry, prevention is better than cure. etc
NSW Work cover put out a document regarding two attachment points after a nasty accident and this document has been refered to many times. Work cover became involved with the incident.
Really, the gyms are doing what they are now required to do.
In the states, UK and other places, there is only the tie in method, and everyone seems to get it right.
Work cover protect not only the workers but the participants as well. If there is an incident within a complex,Climbing centre, swimminng pool or the like, there is to be a report sent to Work cover and aslo the insurance company. More work for operators, but that is the requirement.
Hope that sheds some light on the reasons why gyms do what they do.
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