# An electrical code question **URL:** \ **Category:** In My Humble Opinion\ **Created:** [February 14, 2015, 8:45pm UTC](https://boards.straightdope.com/t/an-electrical-code-question/712666 "2015-02-14T20:45:46Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![carnivorousplant](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/carnivorousplant/32/3563_2.png) [@carnivorousplant](https://boards.straightdope.com/u/carnivorousplant)\ **Post date:** [February 14, 2015, 8:45pm UTC](https://boards.straightdope.com/t/an-electrical-code-question/712666/1 "2015-02-14T20:45:46Z")
Is there an approved way to install a GFCI in a two wire circuit? Our house was built in the 1950s, and we have aquariums. There are pumps, heaters, lights and various other devices running on 110v coonected to power strips. I have caught slight shocks at various times, salt water being quite conductive. Thanks. ---
**Author:** ![TriPolar](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/tripolar/32/3008_2.png) [@TriPolar](https://boards.straightdope.com/u/TriPolar)\ **Post date:** [February 14, 2015, 8:57pm UTC](https://boards.straightdope.com/t/an-electrical-code-question/712666/2 "2015-02-14T20:57:04Z")
Yes, instructions should come with the outlet. The GFCI doesn’t need a third wire ground to work, and it’s a good idea for any outlet without 3 wires. The GFCI outlet is looking for a difference in current between the hot and ground sides and only 2 wires are needed. ---
**Author:** ![carnivorousplant](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/carnivorousplant/32/3563_2.png) [@carnivorousplant](https://boards.straightdope.com/u/carnivorousplant)\ **Post date:** [February 14, 2015, 9:00pm UTC](https://boards.straightdope.com/t/an-electrical-code-question/712666/3 "2015-02-14T21:00:28Z")
Thanks, TriPolar, that is very good news.