The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by gfretwell
Yesterday at 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
ghost307 7
HotLine1 7
renosteinke 6
Potseal 4
Who's Online
0 registered (), 265 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#14690 - 09/29/02 05:29 AM load calculating (elevators)
north Offline

Registered: 09/29/02
Posts: 11
Loc: lindenhurst,n.y.,u.s.a
Is an elevator a continuos or intermitten load

Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#14691 - 09/29/02 07:13 AM Re: load calculating (elevators)
George Corron Offline

Registered: 05/16/01
Posts: 728
Loc: Lorton, Va USA
I've had to do this and I believe they consider them intermittent.

It is regulated by ANSI 17.1.

Like any submittal, you have to ask the elevator contractor for his load ratings and include them in your own as an appliance.

If the contractor has not been selected yet, you can usually find one who will quote you load data. How tall, etc. is all they require. If the bldg is short enough you may have to 'guess' if they want to go hydraulic and you may find you'll have to adjust your calc after the elevator contractor is selected.

Most property owners use the same elevator company over and over.

Back to your question, the definition of intermittent is expected to last for 5 minutes or less, and most elevators never run for a continuous 5 minute period without stopping at a floor.

They design the equipment for continuous use however.

#14692 - 09/29/02 07:16 AM Re: load calculating (elevators)
Joe Tedesco Offline

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
See NEC Article 620 and the Annex D Example D9 Feeder Ampacity Determination for Generator Field Control, and Example D10 Feeder Ampacity Determination for Adjustable Speed Drive Control

See 620.13 and 620.61 in the 2002 NEC.

NEC Article 100 defines a continuous load as one that operates for 3 hours or more.

Duty, Continuous. Operation at a substantially constant load for an indefinitely long time.
Duty, Intermittent. Operation for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load, and rest.
Duty, Periodic. Intermittent operation in which the load conditions are regularly recurrent.
Duty, Short-Time. Operation at a substantially constant load for a short and definite, specified time.
Duty, Varying. Operation at loads, and for intervals of time, both of which may be subject to wide variation.
Joe Tedesco, NEC Consultant


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals