×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Preparing a panel schedule

Preparing a panel schedule

Preparing a panel schedule

(OP)
i have to prepare a panel schedule for a 120/208V schedule . i do not have much electrical backround yet. i have list of loads and a template but i just want tips or advice on how to go about approching the problem. maybe a link of a useful site?

RE: Preparing a panel schedule

Or a EE to help? You're probably overthinking it. Your load list needs to distinguish between single phase 120 V loads, single-phase 208 V loads and three-phase 208 V loads. The continuous current (three hours or more) cannot exceed 80% of the breaker rating. So a 20 A breaker can carry only 16 A on a continuous basis. The single phase loads should be distributed to balance out the load between the three phases as much as possible.

But seriously, I think you will need some help from a EE or good electrician to do this the first time.

RE: Preparing a panel schedule

Spagedy,

good explanation from dpc but even a better suggestion to get and EE to help you.
I always appreciate other disciplines showing interest in electrical but to do this right you need someone who knows what they are doing to get things right.

In regards to your question however, DPC explained it well and I would just add to it that all loads have to be reflected in the panel schedule as to what they feed (i.e. circuit 1 is it a 20A, 1pole of 15A 1pole or something else, what load does it feed and in what room). Very imporatant and to reitarete DPCs point the loads have to be balanced to the greatest extent possible. When calculating the final connected load you have to apply the sqrt(3) meaning divide the totatl kW by (208V*sqrt(3) or 360).

RE: Preparing a panel schedule

I like that spreadsheet, but it appears that I must use Excel proper to get the calcs to function? Right now I have OpenOffice and I try to keep MS products away as much as possible, but I am not principled in that. I just wish there was another way.

RE: Preparing a panel schedule

There are a million other ways. It's just a table.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources