However, when the number of primary windings of the main transformer is increased to form two parallel primary windings, for example, {HEAD ~ two inverter output cables} for {TAIL ~ each round trip}, that is, a total of four cables are required 
However , when the number of primary windings of the main transformer is increased to form two parallel primary windings , for example , { HEAD ~ two inverter output cables } for { TAIL ~ each round trip } , that is , a total of four cables are required
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH