are more fewer bpss then each input signal would feed more fewer bpss in the depicted example the a1 pair goes to bps slots 0 and 1 the a2 pair goes to bps slots 2 and 3 and the a3 pair goes to bps slots 4 and 5 similarly the b1 pair goes to bps slots 0 and 1 the b2 pair goes to bps slots 2 and 3 and the b3 pair goes to bps slots 4 and 5 note that this is for illustration purposes only as different pairs of as and bs could feed different bps slots each pdca contains wiring to convert the three phase input into three single phase outputs where the legs l1 l2 l3 of the three phase input are wired to the outputs a1 a2 a3 b1 b2 and b3 as follows a1 a2 a3 3 phase delta l1 l2 l2 l3 l3 l1 3 phase wye l1 n l2 n l3 n b1 b2 b3 3 phase delta l1 l2 l2 l3 l3 l1 3 phase wye l1 n l2 n l3 n fig4 a depicts the wiring and slot load scheme for three phase delta power input fig4 b depicts the wiring block for the three phase delta power input pair 1 corresponds to a1 or b1 pair 2 corresponds to a2 or b2 and pair three corresponds to a3 or b3 thus the pdca wires bps slots 0 and 1 to a single phase pair that is formed from l1 and l2 bps slots 2 and 3 of the bps are single phase pair formed from l2 and l3 and bps slots 4 and 5 are single phase pair formed from l1 and l3 fig5 a depicts the wiring and slot load scheme for three phase wye power input.