A look up table, is what it say, a list of data that is used in programing of micro controllers, it is a table that the program use to look up data that it need to do the job, it is a list of data and each data item is associated with a index, in other words where in the table it is, look at the examples at this link.
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A look-up table is a table of constants stored in program memory -Look-up tables can be used to speed up arithmetic operations -The look-up table may be accessed using the DPTR or PC as a pointer to the start of the table. The A register is used as an index to the table.
Look up or Google this: National Electrical Code Table 310.16 This is the table you are looking for. You can find a link by following the related question below.
look it up thats what i did?
a table like your dinner table where you tell only the truth
Look up Ohm's law. Should help