garygid wrote:I think that there is NOT any "clear statement" in the J1772 standard that Level 2 EVSE's be hardwired.
Table 1 says "Per NEC 625"
Figure 4 (described as "The primary method ...", not the ONLY method) labels the two hot wires simply as the "Electric Supply", without any requirement for plugin or hardwired.
Yes, Gary, it is described as the 'primary method'. Sigh. it's not saying the Primary Method refers to how the EVSE is connected to the AC supply - it's saying:
4.3 AC Level 2 Charging
The primary method of EV/PHEV charging that extends AC power from the electric supply to an on-board charger from a dedicated EVSE as shown in Figure 4.
3.1 AC Level 1 Charging
A method that allows an EV/PHEV to be connected to the most common grounded electrical receptacles (NEMA 5-15R and NEMA 5-20R. THe vehicle shall be fitted with an on-board charger capable of accepting energy from the existing single phase alternating current (AC) supply network. The maximum power supplied for AC Level 1 charging shall conform to the values in Table 1. A cord and plug EVSE with a NEMA 5-15P plug may be used with a NEMA 5-1=20R receptacle. A cord and plug EVSE with a NEMA 5-20P plug is not compatible with a NEMA 5-15R receptacle.
3.2 AC Level 2 Charging
A methos that uses dedicated AC EV/PHEV supply equipment in either private or public locations. The vehicle shall be fitted with an on-board charger capable of accepting energy from a single phase alternating current (AC) electric vehicle supply equipment. The maximum power supplied for AC level 2 charging shall conform to the values in Table 1.
Notice that the definition of L1 DID include 1. that fact that it COULD be connected with a plug, and 2. the exact combination of plugs that can be used. Now notice what is NOT included in the L2 definition - no mention of plug what so ever.
This is also reflected throughout the balance of the document. All the diagrams for a L1 EVSE show a plug and define that plug like this: NEMA 5-15 or 5-20 Plug -- while the diagrams for L2 devices say 'electric supply'.
They don't specify a plug for L2 devices because they have already stated in the beginning of the document that OTHER standards also apply - and one of those standards is the NEC - and the NEC in place when the standard was being worked SPECIFICALLY REQUIRED hard-wiring the EVSE to the mains supply.
IF a plug was allowed, they are required to tell us what plug to use because their definition of the scope of the standard is (page 4):
This SAE Recommended Practice covers the general physical, electrical, functional and performance requirements to facilitate conductive charging of EV/PHEV vehicles in North America. This document defines a common EV/PHEV and supply equipment vehicle conductive charging method including operational requirements and the functional dimensional requirements for the vehicle inlet and mating connector.
The DID define the range of connectors allowed for connecting a L1 device to mains, but did NOT define the range of connectors allowed for a L2 device because their spec is limited by the NEC and the NEC in place at the time forbids connectors for L2.
garygid wrote:Perhaps, because a plug is not shown explicitly in Figure 4, some interpret that as "plugin forbidden"?
So, nothing I can find in J1772 specificly requires "hard-wired" (or specifically prohibits plugin) for Level 2 EVSE.
So, what part of J1772 is AndyH referring to?
Some states have not yet adopted the 2008 NEC, and an earlier version of NEC 625 apparently did not provide for plugin Level 2 EVSEs. Perhaps that is where the confusion arises?
I've already quoted you page and section and copied the blasted definition of a L1 and L2 device per J1772 that clearly shows the difference. No organization is going to say in paragraph 3.12: Gary - what this means is that we don't want you to connect a potentially 90A device to your 40A dryer plug in a garage where you might store gasoline or have a gas-fueled water heater. So sorry."
While the CURRENT NEC - the 2008 with changes voted later - might allow a plug - that very very clearly was not the case when the DoE sent eTEC to tell the entire country how to do it. If it was already legal to connect the EVSE with a plug, why is Nissan spending so much money to streamline the permitting and inspection process for hard-wired EVSE? Why do the EVSE manufacturers state specifically that the devices must be hard-wired? Why are EV advocacy organizations suggesting that 100% hardwired might be too restrictive? I listened to the last J1772 meeting - JUNE 2010 - and there were a lot of organizations represented - including auto companies and EVSE manufacturers - and they seem to be under the impression that the devices need to be hard wired.
So no. It might be allowed NOW per the 2008 NEC as amended - and that's GREAT! But it was not allowed when all these specs and briefings and plans and other now-overcome-by-events documents were created.