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In the shed you have described there is no grounding and a potential comparison bar, so you should not reset the shed or bring a grounding shed from a reset structure. You must install a grounding electrode and potential equalizer. Shed pillars cannot be used as a grounding electrode because you do not know what goes underground and the electricity law is very clear on the subject. You must only check the grounding resistance to the ground at the above electrode before connecting it to the hollow bar and columns. You should check resistance between the potential comparison bar for each thorn. And another thing, measuring LT with a temporary feed will give you a measurement of the LT fault loop on a temporary feed and not the LT you need. Remember that LT is not a grounding measurement, it is a fault loop measurement. The best example is the reset TN-S, where the current does not flow through the ground in any condition, even in the fault. Successfully.

In the shed you have described there is no grounding and a potential comparison bar, so you should not reset the shed or bring a grounding shed from a reset structure. You must install a grounding electrode and potential equalizer. Shed pillars cannot be used as a grounding electrode because you do not know what goes underground and the electricity law is very clear on the subject. You must only check the grounding resistance to the ground at the above electrode before connecting it to the hollow bar and columns. You should check resistance between the potential comparison bar for each thorn. And another thing, measuring LT with a temporary feed will give you a measurement of the LT fault loop on a temporary feed and not the LT you need. Remember that LT is not a grounding measurement, it is a fault loop measurement. The best example is the reset TN-S, where the current does not flow through the ground in any condition, even in the fault. Successfully.