supply of q-series neutral line relay style qn1k 1000 ohm, 24v dc, 6f/6b complete with p lug board (base plate), connectors and retaining clips etc. and conforming to brs:930 & rdso letter no sts /e/relays/uea/pi dated 30.05.97 annexure i and irs:s-34/68 amd.6 & s-23/88 amd.1 or latest. the interloc king code for this unit shall be bdekx. [ warranty period: 30 months after the date of delivery ] ] , supply of q-series neutral line relay style qn1 50 v dc, 12f/4b or 8f/8b, complete with pl ug board (base plate), connectors and retaining clips etc. and conforming to brs- 930 and specification no. irs:s-34 & s-23 (as applicable) or latest. the interlocking code for this unit shall be abdef or abcef. [ w arranty period: 30 months after the date of delivery ] ]