Logically Controlled Outlets; Check my circuit

This is NOT a design you should build yet, I am seeking proof reading from the community.

Here is a circuit diagram and a parts list for a five outlet controller. From outlet 1 I will be running a light (AC110v 400 watts). Outlets 2 through 5, I will be running small water pumps (AC110V 2 watts). The sixth outlet is for an Arduino Due board, and does not require switching. An AC/DC converter step down power supply is added to supply power to the optically isolated relay board (for safety and EMI). All parts will be in waterproof plastic housings. The outlets, converter, and relay will all be in separate enclosures with connecting wires running through plastic conduit. (The load is connected to the COMM input on the relay and the NO pin is connected to the HOT on the outlet). The Arduino(not shown), will also be in it’s own waterproof plastic enclosure connected by plastic conduit to the relay. Considering adding shielding, but not sure if it is necessary. So,
I = W/(0.8 * V). Looking at around 4.5 amps for the light and negligible amperage for each pump(around 0.09A total). With the Arduino being able to sink 400mA total form it’s outlet, I think am pretty safe for over current–I am at less than 5 amps. I included the breaker on the plug just in case anyone decided to plug in their hairdrier, microwave, dishwasher, and curling iron into the device. (Side note: All the outlets are single plug GFCI, I couldn’t find a good pic for the diagram, but the link below shows what I am using.) Circuit diagram is attached. Thanks for the comments in advance!

Questions:

  1. How does it look? comments/questions
  2. Is my grounding correct? The converter does not have a ground pin and I believe the documentation says it is isolated.
  3. Is my wiring/math correct? Looking for more eyes on it.
  4. Am I forgetting anything?

parts/datasheets:

AC/DC converter: http://www.digikey.com/product-search/en?pv1525=62&pv1120=72&FV=fff40009%2Cfff80229%2Cfffc03b1&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

Relay: http://www.ebay.com/itm/like/271738487715?lpid=82&chn=ps

Outlet: http://www.globalindustrial.com/g/electrical/plugs-receptacles/Grn-Fault-Protection/Leviton-SmartLOck-Com-GFCI-Devices

Breaker extension cord: http://www.growmaxx.com/Item/780035

I would add circuit breakers or fusing.

Ok, There is a breaker on the plug I am wiring off of, 15amp. The system as a whole is protected from over current, but the individual loads are not protected within the system. Protect each outlet individually at the levels I intend to use as well?--(the outlets are all GFCI and in parallel, so I at least have ground fault on each outlet--not the same as over current though). Protect the AC/DC converter as well? Where else would you recommend I add fusing/breakers?

IMO, I would fuse an outlet to the contact rating of the relay.