Trying to verify if building load VA is larger than building service

[Elecestim123]

Sorry if I worded that terribly.

Basically I'm an estimator. Never had to do service calculations or anything of the like.

I'm currently working on a project, which admittedly has pretty terrible electrical drawings. Half the lights aren't labeled, stuff isn't circuited, things are labeled "TBD" for conduit stubs, primary routing isn't even figured out, etc.

These drawings are "for construction", and are bid for award, so I'm doing my best to fill in all the holes there are (And there are tons).

There are 3 electric traction elevators on the job. No information is provided as to what size amperage the elevators are. Nothing on the one either. No spares shown in the main switchboard or any distribution panels. Basically I need to assume somewhere to feed these elevators from. I just want to make sure by adding these feeds, I'm still within the total service amperage, otherwise I need to pass along to the engineer the service isn't big enough. Just don't want to look stupid saying anything If I'm wrong because I've never had to calculate this.

There's a load summary chart on the ONE-LINE, which shows total VA/amperage for the Main switchboard, and each other switchboard. These load summary seems to be missing a couple panels/transformers for each switchboard, but overall the total VA is calculated is 2,228,060. Total apmerage is 4,267.2

Service size is 4,000A 480/277

Again, that load summary seems to be missing a couple panels/transformers in the calculations, but either way with the load summary they have it's already over the main service size of 4,000A

Now I need to figure in this (3) elevators. Might just assume 100A each.

I'm sure there's some type of derating over whatever that allows total building load to be higher than the total service size (since not everything is a continuous load), but what's the tolerance exactly. I'm assuming total building load is around 4,500 or so realistically, if not a little more, on this 4000A calculated service. Do I need to say something or is everything within tolerance?

Thank you!

 

[acrwc10]

you seem to be asking for a simple answer to a complicated question, there isn't enough information in your question to give a good answer.

 

[Dennis Alwon]

You are saying the service is 4,000 amps but the load is 4,265+ amps and you want to add more to the service? I would tell them they either need an engineer or have someone from your company that can do calculations to figure it out.

If I am correct on what you stated then there is no way I would install those elevators