CALCULATIONS TO DETERMINE IF PILES ARE NEEDED

WT. OF TRANSFORMER = 7 KIPS

WT. OF SWITCH = 5 KIPS

WT. OF SLAB = (18 X 20 X .41) + (1.16 X 2 X 20) + (1.16 X 3 X 18) + (21 X 2 X 2 X .41) + (17 X 3 X .41)(145LBS/FT3) = 36.1 KIPS
                                                                                               
36.1 + 5 +7 = 48.1 KIPS = .32 KIPS                                              ALLOWABLE: 1KIP
                      152 FT2          FT2                                                                        FT2