Rank: New forum user 
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In getting the calculation for crane lifting- I would like to refer to this formula- Lifting Capacity= Total Load/ Crane Capacity x 100%
Need Clarity in the determining the Crane capacity- is it the appropriate to use crane rated capacity or the capacity from load chart corresponding to the boom length and radius of intended load?
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Rank: Super forum user 
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I would imagine it would be the former, capacity from load chart corresponding to the boom length and radius of intended load. As the calucation would need to be based on an accurate figure from the load chart and corresponding to the required boom lenght, and Radius. Simply working out the maximum calculation as far as the crane can be, serves no use or purpose at all for working out the required capacity as this "Maximum" figure may effect other calculations, for that particular lift, such as the Point load on the Out Riggers, etc.. Take a peek at this pdf on page 14, for an idea on how different load calculations can vary between boom lenght and Out rigger point loads https://www.terex.com/cranes/en/cs/groups/webcontent/@web/@cra/documents/web_content/ucm02_047834.pdf
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 1 user thanked gerrysharpe for this useful post.
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Rank: New forum user
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Thanks for your valuable contribution @Gerry,
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1 user thanked Rufai Abiodun for this useful post.
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Rank: Forum user
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I have previously completed and sucessfully passed the Appointed Person (AP) course. In my opinion, if you are asking such a question, you are not a trained and competent AP, therefore be careful if you have been asked to complete a lift plan or have been asked to proof other persons lift plans (it may bite you in the a**e).
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Rank: New forum user
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Originally Posted by: Phil John  I have previously completed and sucessfully passed the Appointed Person (AP) course. In my opinion, if you are asking such a question, you are not a trained and competent AP, therefore be careful if you have been asked to complete a lift plan or have been asked to proof other persons lift plans (it may bite you in the a**e).
???
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Rank: Forum user
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I agree with both responders.
The question you are asking demonstrates that you do not have the knowledge you need in this area to be planning the lift. In the UK, there should be an appointed person and lift supervisor involved in the lift operation. They may be the same person and they will have the knowledge you need to plan the lift.
Use your experts, its what they are there for.
As safety professionals, we cannot possibly know everything. The trick is recognising what you do not know and when to get the appropriate expertise in. Lifting operations, when poorly planned can go horribly wrong.
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Rank: Forum user 
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Rufai, You need to have a lift plan undertaken, You as a rule should not exceed 80% of the lifting capacity of the mobile crane. A complete lift plan will also take you ground point loading into consideration.
As others have stated, in the uk it is an Appoiinted person (level 6 qualification)who would undetake this task. If you have one that you want looking over I dont mind taking a Look, what I would normally do is calculate the load weight plus a margin of safety, the max radius & height of lift then spec a crane to complete depending what is available in the geographical area. Again, just to reiterate, it is a complete seperate trade. Kind regards
Angelo
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Rank: New forum user
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Yes use the lifting chart, do not use the cranes rated capacity!!!
Obv there are quite a few safety factors to be taken into account here but just one example is the safe working load at a given angle or length...
I think you need to email someone such as inspections@myloler.com for safety factors before just jumping to any conclusions!
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