# Still Confused about alternate CT's **URL:** \ **Category:** Getting Started\ **Tags:** ct, emonpi\ **Created:** [5 September 2017 15:56 UTC](https://community.openenergymonitor.org/t/still-confused-about-alternate-cts/5016 "2017-09-05T15:56:15Z")\ **Posts on this page:** 1\ **Showing post:** 12
**Author:** ![Robert.Wall](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/robert.wall/32/38246_2.png) [@Robert.Wall](https://community.openenergymonitor.org/u/Robert.Wall)\ **Post date:** [27 October 2017 15:04 UTC](https://community.openenergymonitor.org/t/still-confused-about-alternate-cts/5016/12 "2017-10-27T15:04:19Z")
Bill Thomson has reminded me that he posted a full explanation some time ago. For those who weren’t around at the time, didn’t search or didn’t remember it, here’s a link > [@US 200 Amp Service explained or Do I need a 200 Amp CT?](https://community.openenergymonitor.org/t/us-200-amp-service/4219): > > A common question is “I have 200 Amp service, do I need a 200 Amp CT?” The answer is most likely no. Unless you have a very large house, a 100 Amp CT would be a better choice. (Large houses, typically have 320 or 400 Amp service and may actually need a 200 Amp CT, but this article addresses 200 Amp service installations) So what does the term 200 Amp service refer to? Simply put, it means the weakest link in your Service Entrance Wire, Meter Base, Meter, Main Breaker, Load Center (circuit b… --- _[View the full topic](https://community.openenergymonitor.org/t/still-confused-about-alternate-cts/5016)._