(8)The date on which the clearing obligation takes effect for counterparties in the first category should take into account the fact that they may not have the necessary pre-existing connections with CCPs for all the classes subject to the clearing obligation. In addition, counterparties in this category constitute the access point to clearing for counterparties that are not clearing members, client clearing and indirect client clearing being expected to increase substantially as a consequence of the entry into force of the clearing obligation. Finally, this first category of counterparties account for a significant portion of the volume of credit OTC derivatives already cleared, and the volume of transactions to be cleared will significantly increase after the date on which the clearing obligation set out in this Regulation will take effect. Therefore, a reasonable timeframe for counterparties in the first category to prepare for clearing additional classes, to deal with the increase of client clearing and indirect client clearing and to adapt to increasing volumes of transactions to be cleared should be set at 6 months. Furthermore, the date on which the clearing obligation takes effect for counterparties in the first category should also take into account whether more than one CCP already clear the same class of OTC derivatives by the time this Regulation enters into force. In particular, an important number of counterparties seeking to establish clearing arrangements with the same CCP at the same time would mean that more time is required than when counterparties have the choice of several CCPs to establish their clearing arrangements with. Therefore, an additional period of 3 months should be granted to ensure an orderly implementation of the clearing obligation.