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one thing to remember... If you leave a 240v appliance in the device then unplug one of the 110v plugs... the end is live at 110v! Makes for an interesting wake up!
Can you elaborate? What happens?
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[FONT=Verdana, sans-serif, Helvetica]II A. The NEC has absolutely no direct jurisdiction over portable
chargers or on-board chargers. Please read carefully and understand
Article 90-2 Scope. Utilization equipment (appliances - including
portable chargers, toasters, TV's, and EVs) are normally regulated by
product standards developed by UL, ANSI, and other standards
development organizations. UL standards do, of course, consider the
NEC requirements in developing product standards.
> B. SPECIFIC REQUEST: We are requesting that hobbyists EV operators
>and electric vehicle OEMs be allowed to continue to use NEMA 14-50
>connectors with GFCI for Level II charging at 240 volts for both private
>and public power supply stations. While the current version of Article
>625 does permit the use of portable cord-and-plug-connected electric
>vehicle supply equipment at 125 volts, these low power charging systems
>drastically extend the time required for recharging an EV, and curtail
>it use. Many existing EVs are only equipped for charging from 240
>volts.
II B. The NEMA 14-50 R/P configuration even when used with a
conventional GFCl circuit breaker has several inherent design features
and corresponding conditions of use that make it unsuitable for use
with EV's. For private use as a general purpose power outlet, the
requirements of Article 410 would apply. For public charging this
configuration is inappropriate. The RV industry, in my opinion, erred
in selecting this configuration for RV parks.
First of all, the NEMAl4-50 R/P configuration was originally developed
for electric ranges installed in "dry" locations. As such, when a
consumer purchases a new range from an appliance store, the
delivery/installers are instructed to turn off the range circuit
at the service panel, remove the plug and old range, plug in the new
range and push it against the wall and turn the circuit breaker in the
service panel back on. Typically, the range stays there until the
owner moves or it is replaced with a new one. In which case the
circuit breaker should be turned off before removing the range. Under
these conditions of use, the NEMA 14- 50 R/P is acceptable if this
procedure is followed.
Second, the "conditions of use" for this product require that " the
circuit breaker or disconnecting means be turned off before inserting
or removing plug". Thus the requirements of 551 - 77(b).
Third, failure to read (if the label is legible or present) and follow
the directions could result in "direct" contact with "live" parts.
Thus the requirements of Article 551-77(f). In my opinion, relying on
labels to avoid or mitigate serious shock hazards is poor safety
policy at best.
Fourth, the configuration has no inherent protection against
liquids(water) and for general use( Article 410 such as a private
garage) or special use (Article 551 RV parks, for example) the
receptacle must be in a weatherproof enclosure (ref. Article 410-57
and Art 551-78).
Fifth, this configuration was not designed for frequent use and must
only be capable of 250 mating/de-mating cycles.
Sixth, if the instructions above are not followed this configuration
has a serious design flaw, referred to as an intermittent neutral,
that has resulted in extensive electrical equipment damage in RV's and
potentially hazardous conditions. If the plug is tipped(which is
typical in right angle configurations) during removable the neutral
terminal can open prior to the phase and ground terminals opening. The
effect is to possibly expose low(120) voltage equipment, such as TV's
microwaves, GFCl receptacles, etc., to high(240) voltage resulting in
damage to the equipment which could in turn result in a potentially hazardous condition.[/FONT]
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