Project Nexus Workgroup Primes & Subs 7 th October 2014

Background Action NEX09/03 from 9 th September Workgroup: –To provide an example of how a Class 4 Prime with a Class 3 Sub meter would actually work with regards to reconciliation. The next slide provides an example of a Prime with two Subs.

Prime & Sub Reconciliation – Co-Terminus Reads Prime – any class Sub 1 – any class Sub 2 – any class Read 1 Read 2 Read 3 Read 4 Read 1 Read 4 Read 5 Read 3 Read 2 Co-Terminus reads Sub 1 has been subject to 4 reconciliations over the period, Sub 2, 3 reconciliations and the Prime 1 reconciliation.

Prime & Sub reconciliation Sub reconciliation: -Sub reconciliation is at meter point level. Each time a valid read is received the Sub will be reconciled Prime reconciliation -Prime reconciliation requires reads at the same time for the Prime meter and all its Sub meters (co-terminus reads) -When co-terminus reads are received the Subs can be reconciled and the Prime can be reconciled (the Prime consumption is calculated, all the Sub consumptions are deducted, what is left is the gas consumed by the appliances fed directly by the Prime).