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Busta01
Posts: 19
Registered: ‎03-16-2011
Message 1 of 8 (1,676 Views)

Panel Schedules

1676 Views, 7 Replies
07-15-2011 02:52 AM

Hi all.

 

Can any one explain to me why the panel schedule for a single phase panel shows two phase columns, "A" & "B"...

Surely for a single phase system there should only be one phase column.

Design Technician
CKR Consulting Engineers
Nala Consulting
Sandton
South Africa
Contributor
sparkie001
Posts: 23
Registered: ‎02-07-2007
Message 2 of 8 (1,654 Views)

Re: Panel Schedules

07-15-2011 08:43 PM in reply to: Busta01

No easy answer - a matter of historical predicence.

 In the US, with two hots 'A' and 'B' and a Neutral 'N' is considered "single-phase":

1 - Some say it's to differentiate it from old 2-phase systems where the phase angles were 90 degrees apart

2 - Because you only get one sine waveform when you put an oscilloscope across hot-hot or hot-neutral.

3 - Because you can only connect single-phase loads to it.

 

If you use a search engine you'll get another 100 answers.  <G>

Distinguished Contributor
jboone
Posts: 167
Registered: ‎08-31-2006
Message 3 of 8 (1,625 Views)

Re: Panel Schedules

07-19-2011 06:23 AM in reply to: sparkie001

In the US single phase means either 120v 1POLE -OR- 208v 2 POLE.  It is very confusing I know and don't personaly like using those terms.  It should be more specific, and most engineers know that.

Programs should be more specific, but I think the programming going on in in electrical is FAR from being very engineer friendly.

Contributor
Busta01
Posts: 19
Registered: ‎03-16-2011
Message 4 of 8 (1,603 Views)

Re: Panel Schedules

07-20-2011 01:29 AM in reply to: jboone

Thanks a lot.

 

Im in South Africa and we very seldom, if ever, use a 2-pole panel. We mainly use a single phase or three phase panels. The distribution systems we use are either 230v single phase or 400v / 230v three phase. So we either have one phase column or three phase columns on the schedules.

 

Im also a draughtsman, and im just trying to set a set of standards for the company so when we introduce the program fully into our office, its easier to use by the other draughtsman.

 

Thanks a loyt for the help, its made some things very clear to me.

Design Technician
CKR Consulting Engineers
Nala Consulting
Sandton
South Africa
Valued Mentor
julianjameson8403
Posts: 455
Registered: ‎06-16-2010
Message 5 of 8 (1,601 Views)

Re: Panel Schedules

07-20-2011 01:46 AM in reply to: Busta01

The explanations by the US guys have also helped me understand the response from the UK Autodesk office. Their response was that "In the US there was no requirement for only a single column schedule so that is why they haven't done it."

 

Surely it is a simple task to add another tick box in the panel schedule options to ignore/hide the last two columns. Also noticed that when trying to do a "Rest of the World" single phase panel schedule, the loads and phase start to get confused by circuiting "By Phase".

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Contributor
Busta01
Posts: 19
Registered: ‎03-16-2011
Message 6 of 8 (1,404 Views)

Re: Panel Schedules

10-19-2011 01:18 AM in reply to: julianjameson8403

It shouldn't have been an issue to place a simple tick box.

 

There is how ever an option to hide the phase columns, which in fact would make sense, because even if you have one phase or three phase the total load should be the same? correct me if im wrong, I dont know much about Loads on boards.

Design Technician
CKR Consulting Engineers
Nala Consulting
Sandton
South Africa
Active Contributor
jmlarias
Posts: 29
Registered: ‎11-09-2011
Message 7 of 8 (237 Views)

Re: Panel Schedules

03-10-2014 01:47 PM in reply to: Busta01
Hello, This is an old post but I'd like to know if you found a workaround for the problem of the single phase - single pole system. I am in France and here we never use two poles single phase systems. Sorry for resuscitate this old topic. Jesus
Contributor
Busta01
Posts: 19
Registered: ‎03-16-2011
Message 8 of 8 (221 Views)

Re: Panel Schedules

03-10-2014 11:27 PM in reply to: jmlarias

Hi.

 

Don't stress about the resurection of this topic.

 

Unfortunately I haven't found any workaround yet. I also haven't worked properly in Revit for a while now.

I have a feeling this will have to be a wishlist item for future Revit packages.

 

Paddy.

 

Design Technician
CKR Consulting Engineers
Nala Consulting
Sandton
South Africa

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