topic Re: Panel Scheduling - Phase Problems in Revit MEP Forum

Panel Scheduling - Phase Problems

anthony_iskandar — Sat, 07 Aug 2021 02:12:05 GMT

I am new in MEP discipline, my TARGET is to make this schedule:

the EFB3 Panelboard (3 Poles 4 Wires) is connected to:

EFB3-1 : A mechanical equipment (3 phase)

EFB3-2 : Three jet fans @ 500VA

EFB3-3 : Three jet fans @ 500VA

EFB3-4 : Three jet fans @ 500VA

Note: I am confused about jet fans phase, but currently is set to 3 phase

And my panel schedule result is like this:

Is my result alright?

Or I miss something? Why I can't get 1500VA for EFB-2, EFB-3, EFB-4 in each cell, like my TARGET?

Can a 1 phase equipment connected to 3 phase panelboard? I googled it says can, but when I change the jet fans to 1 phase, it says "The family no longer matches the properties for the Circuit. Disconnect the family from the Circuit?"

Re: Panel Scheduling - Phase Problems

ricaun — Sat, 07 Aug 2021 14:08:03 GMT

Probably you are setting the wrong voltage or something...

By the look, your main system is 120/208 Wye (Check if has 4 Wires on the Electrical Setting).

To create 1 phase you need to set your Voltage to 120 V and then connect to the main panel.

If you change the family when the circuit is connected Revit probably disconnect by default. Recreate the Power circuit and connect it to the main panel.

If you are using Electrical Equipment, after you create a Power circuit you should select a Distribution System of the panel. This should fix some not-found panel problems.

See yaa!

Re: Panel Scheduling - Phase Problems

anthony_iskandar — Tue, 10 Aug 2021 03:09:56 GMT

Okay, so I changed the exhaust fans phase to 1 phase by also change the exhaust fans voltage to 120V and it worked, and the result is okay, but why the Total Load isn't equal to 8167VA? How to change the Amperes? When I change the 20A to 6.8A or 30.4A, it says "Total connected load for Circuit EFB3-1 is exceeding 80% of the defined rating (7 A)." or "Total connected load for Circuit EFB3-1 is exceeding 80% of the defined rating (30 A)."

Thank you so much before.

Re: Panel Scheduling - Phase Problems

ricaun — Tue, 10 Aug 2021 13:33:18 GMT

The Rating parameter is used to set the protection of the circuit and control the Wire Size.

By the Revit rule, the Rating value needs to be 1.25 times the circuit Current or can not exceed 80% of the Rating value.

About the Total Load, looks like your Exhaust Fan circuit has some Demand Factor or something.

Check the Load Classification, could be that.

Re: Panel Scheduling - Phase Problems

anthony_iskandar — Tue, 10 Aug 2021 13:35:51 GMT

But as you can see in my TARGET table (first post), the Amperes didn't match with mine, is this okay?

Re: Panel Scheduling - Phase Problems

ricaun — Tue, 10 Aug 2021 14:07:05 GMT

I tested and works fine.

Your first circuit is an Electrical Equipament?

Re: Panel Scheduling - Phase Problems

anthony_iskandar — Tue, 10 Aug 2021 14:13:50 GMT

You mean you changed the Amperes? How?
Yes, I use "lighting and appliance panelboard", I don't know should I use this kind of panel board, or switchboard, or single phase circuit (but duplicate to 3 phase)?

Please type your reply above this line -##

Re: Panel Scheduling - Phase Problems

ricaun — Tue, 10 Aug 2021 14:33:46 GMT

Here is my sample project (Revit 2021).

I change the template panel to Apparent Current. I suppose this is what you want...

Re: Panel Scheduling - Phase Problems

anthony_iskandar — Tue, 10 Aug 2021 14:38:50 GMT

Ah, I didn't see your attachment before this, yes actually my first circuit is electrical equipment 3 phase.
I'll try it tomorrow, big thanks!

Re: Panel Scheduling - Phase Problems

anthony_iskandar — Wed, 11 Aug 2021 00:36:07 GMT

Based on this picture, CKT 1 should be the 30.4A electrical equipment (3 phase, R, S, T), then CKT 2, 3, and 4 are the 6.8A exhaust fans with CKT 2 on S, CKT 3 on T, CKT 4 on R. Is it possible to manage these details in Revit?

Re: Panel Scheduling - Phase Problems

ricaun — Wed, 11 Aug 2021 13:51:50 GMT

Of course is different... Your diagram voltage is 220/380V.

Electric 101:

Power = Voltage x Current.

On Diagram you are using 220/380V.

CKT 1:
Power: 20000VA
Voltage: 220V
Current = 20000 / 220 / 3 ~= 30.3A

On Revit you are using 120/208V.

CKT 1:
Power: 20000VA
Voltage: 120V
Current = 20000 / 120 / 3 ~= 50.5A

Configure your Revit Voltage right and should work fine!