a load center 10 of the type commonly employed within trailer parks and marinas is shown in fig1 and consists of a plastic bottom 11 which carries an insulative support 12 on to which a circuit breaker or electric switch ( not shown ) is assembled . the support 12 is attached to the load center bottom 11 by means of recessed screws 13 and includes a pair of circuit breaker or electric switch stabs 14 insulated from each other by an integrally formed dielectric shield 18 . a line terminal lug 16 hereto &# 34 ; load center line terminal lug &# 34 ; which contains the line terminal screw 17 hereinafter &# 34 ; load center line terminal screw &# 34 ; slips onto the line terminal strap 15 which , in turn , is fastened to the support 12 by means of rivets 9 . when a two - phase power distribution system is connected to the load center , one - phase line conductor 24 is attached to one load center line terminal lug 16 and a separate phase line conductor 25 is attached to the other load center line terminal lug 16 as indicated . as described in aforementioned u . s . pat . no . 3 , 801 , 875 , a circuit breaker is attached to the circuit breaker stabs 14 and the wire conductors leading to an external load ( not shown ) are connected to the load terminal screws on the circuit breaker . the circuit neutral connection is made with the external load by means of a neutral bar 19 which is attached to the bottom 11 by means of screws 13 as shown . the circuit neutral conductor 52 connects with the neutral bar by means of a neutral lug 22 and neutral lug screw 23 . the neutral lug is first attached to the neutral strap 21 which is then inserted within an electrically conductive sleeve 39 to which the neutral connector screws 20 are threadingly attached . neutral connection with the external loads is made by connecting a corresponding plurality of wires ( not shown ) with each of the neutral connector screws 20 . the load center 10 when employed as the central load center is individually wired with a distribution transformer ( not shown ) by means of the two - phase line conductors 24 , 25 and the circuit neutral conductor 52 . when a plurality of such load centers are employed within a radial - feed two - phase power distribution system as described earlier , each of the satellite load centers must be electrically connected with the distribution transformer or central circuit breaker by means of a separate pair of line conductors and a separate neutral conductor . when connecting the satellite load centers by means of a loop - feed arrangement whereby each satellite load center is connected with the ( not shown ) instead of with the central load center , the loop - feed line terminal lug 49 arrangement depicted in fig2 a is used . the loop - feed line terminal lug arrangement hereafter &# 34 ; loop - feed lug &# 34 ; includes an upper line terminal lug 33 and a lower line terminal lug 34 . the upper line terminal lug includes terminal lug 16a and terminal screw 32 which are attached to a z - shaped line strap 27 by means of a screw 29 and a slot 28 through the offset end 30 . the opposite offset end 31 of the z - shaped line strap 27 is connected with the load center line terminal lug 16 by inserting the offset end 31 within the load center line terminal lug opening 26 . the lower line terminal lug 34 includes a terminal lug 16b and terminal screw 38 which are attached to a planar line strap 35 by means of screw 36 and slot 37 . the lower line terminal lug 34 is connected with both the load center line terminal lug 16 and the offset end 31 of the z - shaped line strap 27 by inserting the planar strap 35 within the load center line terminal lug opening 26 and tightening the load center line terminal screw 17 to bear down on both the offset end 31 of the z - shaped line strap 27 and the planar line strap 35 . the provision of upper and lower line terminal lugs 33 , 34 insure that the incoming two - phase line conductors 24 , 25 and outgoing two - phase line conductors 24 &# 39 ;, 25 &# 39 ;, ( fig3 ) are readily identified in order to prevent inadvertent harm which could occur by erroneously disconnecting the outgoing two - phase line conductors 24 &# 39 ;, 25 &# 39 ; instead of the incoming two - phase line conductor 24 , 25 when service is performed or connections are made with loads connected to the load center . the provision of the upper terminal lug 33 also provides clearance for the outgoing conductors 24 &# 39 ;, 25 &# 39 ; within the close tolerances of the load center . a loop - feed neutral bar 51 as shown in fig2 b includes a pair of offset neutral lugs 40 , 41 which are attached to a neutral strap 21 by means of screws 46 , 47 and slots 53 , 54 . one end of the neutral strap 21 is inserted within the bottom of the extended opening 56 through the tubular sleeve 39 to which the neutral connector screws 20 are attached . the loop - feed neutral bar 51 is attached to the bottom 11 of the load center 10 ( fig1 ) by inserting screws 57 through slots 48 and 55 formed at opposite ends of the neutral strap 21 . a loop - feed connected load center 50 is depicted in fig3 with a pair of loop - feed line terminal lugs 49 connected to the load center line terminal lugs 16 and attached to the circuit breaker support 12 on the bottom 11 of the load center . also shown are the incoming two - phase line conductors 24 , 25 connected with the lower line terminal lugs 34 and the outgoing conductors 24 &# 39 ;, 25 &# 39 ; connected with the upper line terminal lugs 33 which connect with the other load center . although not shown , the other load center is identical to the loop - feed connected load center 50 , depicted herein . the loop - feed neutral bar 51 is arranged on the bottom 11 as described earlier with the incoming neutral conductor 52 connected with one offset neutral lug 41 and with the outgoing neutral conductor 52 &# 39 ; connected with the other offset neutral lug 40 as indicated . it is thus been shown that circuit breaker and electric switch load centers can be adapted for loopfeed connection at either the point of manufacture or at the installation site by means of loop - feed line terminal lugs and loop - feed neutral bar lugs in accordance with the teachings of the instant invention .