MikeD wrote:baustin: I notice from your link that GE's DuraStation is ETL listed, but not UL listed, whereas GE's Watt-Station is both UL listed and ETL listed, as are most commercial EVSEs that I am aware of. From a safety standpoint I wonder why.
I looked at the "Residential DuraStation: Installation Guide" using Home Depot's link and found that it documents its EVSE's controlling 240v circuit breaker can be 40a, 30a, 20a, or 15a depending on whether an internal jumper is set for, respectively, 30a, 24a, 16a, or 12a maximum current draw from the EV. This is the only commercial EVSE that I know of that allows different current output settings AND allows a reduced circuit breaker rating. All the others (Siemens VersiCharge and Ecotality's Blink) ALWAYS require a 40a breaker regardless of a selected reduced output current, undoubtedly as a desirable extra measure of safety (to reduce the possibility of a breaker less than 40a inadvertently being used when the selected current draw x 125% is greater than that).
The following from Siemens explains its EVSE's current reduction capability rationale: "Amperage Adjustment - Installing electrical vehicle chargers into older homes can be a challenge. With the Siemens VersiCharge, the EVSE power output can be adjusted to match facility capability. Increments range from a maximum power setting of 7.2 kW down to 1.8 kW.".
It seems it may be too easy to open the DuraStation and expose electrically live parts, jumpers, etc as the Guide simply reads "Step 5 - Open the front cover of the enclosure." and "Step 9 - Replace cover.".
One further observation is this Installation Guide does not specify the EVSE circuit be a dedicated one, which I suspect is an (unfortunate) oversight. Contrast this rather skimpy 6 page document with the generously detailed 33 page "Installation and Operations Manual" for the VersiCharge.
The manual is a bit sparse. It seems that it was written for experienced installers, and lacks much of the detail and explanation found in other EVSE manuals. It also fails to mention that Torx Security Screws (two T25 bits included) are used on the cover.
I have included a link to some pictures, including the labels on the case. It says that it is built to UL standards. I'm guessing they are awaiting UL certification, or feel that it is not necessary for this device. It may have something to do with it being shipped with no cord attached.
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