How exactly are these boxes generally mounted ?
I've yet to order the box....but wanted some info.
I am definitely not a pro plumber, but I am a pro crastinator
Yes, but the holes for those is a straight shot....unless they expect use to use a right angle driver to drive the screw in...
Yes, it's for a portable generator.
I wanted something fairly weather resistent - in use.
I originally used a regular connector and ordered the Midwest inlet
I received the inlet, and it was a beast in size.
So I switched systems and went with the Hubbell Safety Shroud system and the box posted in the original post is the box I plan to use.
It is illegal to use a portable generator in the manner in which you are planning. There are several safety issues that arise with the use of portable generators when connected to the premises wiring of a building.
Article 702 of the NEC addresses the use of optional standby systems and this is the use you are planning. Article 590 addresses temporary power systems which a portable generator fits into.
To connect a portable generator to a building of any kind it must be connected as a SDS where the grounded (neutral) is also switched. Article 225 addresses outside feeders and branch circuits and mandates that a disconnect suitable as service equipment be use at the building and a cord and plug is not suitable as service equipment.
Go back and read the “sticky” titled “posting here” and I will allow a couple of days for any remarks before closing this thread.
Who ever said this is going to be tied to the panel ?
This will be feeding a transfer switch.
ARTICLE 225 Outside Branch Circuits and Feeders
II. Buildings or Other Structures Supplied by a Feeder(s) or Branch Circuit(s)
225.31 Disconnecting Means.
Means shall be provided for disconnecting all ungrounded conductors that supply or pass through the building or structure.
225.36 Suitable for Service Equipment.
The disconnecting means specified in 225.31 shall be suitable for use as service equipment.
ARTICLE 702 Optional Standby Systems
702.5 Transfer Equipment.
Transfer equipment shall be suitable for the intended use and designed and installed so as to prevent the inadvertent interconnection of normal and alternate sources of supply in any operation of the transfer equipment. Transfer equipment and electric power production systems installed to permit operation in parallel with the normal source shall meet the requirements of Article 705 .
Transfer equipment, located on the load side of branch circuit protection, shall be permitted to contain supplemental overcurrent protection having an interrupting rating sufficient for the available fault current that the generator can deliver. The supplementary overcurrent protection devices shall be part of a listed transfer equipment.
Transfer equipment shall be required for all standby systems subject to the provisions of this article and for which an electric utility supply is either the normal or standby source.
702.12 Outdoor Generator Sets.
Where an outdoor housed generator set is equipped with a readily accessible disconnecting means located within sight of the building or structure supplied, an additional disconnecting means shall not be required where ungrounded conductors serve or pass through the building or structure. The disconnecting means shall meet the requirements of 225.36.
As one can see there is far more to this than just making it work. Those plugs and portable generators have their place but to be used in conjunction with the wiring of our homes is not the place.
EDITED TO ADD;
Unless the transfer switch is suitable as service equipment then landing the cord and plug to the transfer switch is illegal. If the transfer switch is suitable for service equipment then it cost as much as the generator.
The use of panel door transfers is a game of Russian Roulette. Over the life of my electrical experience I have ran into many breakers that would either not open at all or only open one side of the breaker. In such a case the service drop would be back feeding the transformer on the pole or pad putting the life of the utility linesman in grave danger.
There is a reason for the codes and that reason is the practical safeguarding of persons and property from hazards arising from the use of electricity.
Last edited by jwelectric; 05-14-2013 at 11:55 AM. Reason: to add
You lost me at Hello JW....
Sorry, but in laymans terms....what exactly is wrong with the common transfer panels from Reliance, Generac, etc - that I presume we are discussing about ?
If you are having a problem reading post #11 then you should not be messing with a portable generator and the wiring of a home.
Separately Derived System. A premises wiring system whose power is derived from a source of electric energy or equipment other than a service. Such systems have no direct connection from circuit conductors of one system to circuit conductors of another system, other than connections through the earth, metal enclosures, metallic raceways, or equipment grounding conductors
In a SDS the neutral is switched along with the hot conductors. In the link to the UL White Book portable generators are to be connected to the wiring system of a building as a SDS or the transfer MUST also switch the neutral.
Those small six to twelve circuit panels from Reliance do not switch the neutral therefore are not legal for the installation with portable generators.
When the cord from the generator lands at the building Article 225 says that the conductors MUST land in a disconnect that is suitable as service equipment. The cord and plug is not service rated nor are the small panels from the generator companies.
I have a GE 30 amp breaker that has a UL listing. I have a roll of #14 NM-B cable that has a UL listing. Can you tell me why I can’t install a circuit using the 30 amp breaker and the #14 conductors? The same rules apply to portable generators. Just because something has a UL listing in no way means that it can be installed in any other manner than what the codes and the listing of the equipment allows. Read the link in post #11.
So you are saying that a licensed electrician doing residential work would not install a transfer panel as Chef and you described, on a home for a portable generator. I'm not asking what a homeowner would do, because many homeowners should not be allowed to change a lightbulb, let alone install a system like this.
Several years ago I was sent to one of our customers in Michigan to troubleshoot a problem on their multimillion dollar machine system built by my company. When I got there,
the first thing they did was turn off the main panel that fed power to my machine because I removed the cover from our control panel so I could access the relay logic and inverter drives. They told me that MIOSHA fined them recently for running a machine with a panel open. I told them that they deserved that fine, but I also told them that in order for me to troubleshoot their problem, I needed the power on. They allowed me to proceed when I started packing up my tools to leave. Sometimes, just sometimes the rules are a bit TOO much, but they are necessary.
I am definitely not a pro plumber, but I am a pro crastinator
What Bob says is true, and I agree.
The problem that I see with the switch over panels, is that they are Normally for permanent Installs and Not Temporary. Do you have a web link for the one you will be using ?
The Gen you plan to use is made for Temporary use, that is why it has a Twist Lock and is not direct wired.
Make sure you have a Disconnect that disconnects all conductors from the main Line feed, It needs to do that.
Or Run Extension cords for what you want to power.
What is safer ? Depends, on JW's Approval.
Be careful playing with electricity.
Last edited by DonL; 05-15-2013 at 08:19 AM.
Theory only works perfect in a vacuum.
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