ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Increasing demand factors in residential
by gfretwell - 03/28/24 12:43 AM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
Do we need grounding?
by NORCAL - 03/19/24 05:11 PM
240V only in a home and NEC?
by dsk - 03/19/24 06:33 AM
Cordless Tools: The Obvious Question
by renosteinke - 03/14/24 08:05 PM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
1 members (gfretwell), 32 guests, and 14 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#57849 10/22/05 02:31 PM
Joined: Sep 2005
Posts: 33
N
Member
Hi everone. I have a question i need to know if im on the right track on or not.

ok here we go

one cooktop and two ovens are connected to one brach circuit in a kitchen ofa one family dwelling. The cooktops name plate rating is 4kw@240volt , while each oven has a nameplate of 5.5kw@240volt. The min load calculation for this brach circuit is _____watts.


I think the answer that I found in the (1993) code book is table 220-19.
answer is 14kw
according to the table 3 appliances = 14kw
any help would be grateful thanks..

#57850 10/22/05 03:53 PM
Joined: Apr 2002
Posts: 558
C
Member
a single cooktop and not more than 2 ovens connected to a single branch circuit is considered a single range not 3 ranges. Look at the notes under the table but I believe you add 5% for each kw over the 12kw rating.

Curt


Curt Swartz
#57851 10/22/05 04:43 PM
Joined: Sep 2005
Posts: 33
N
Member
Just got done reading the note #1
ok lets see
4kw(rating of above)+5.5kw(rating of above)+5.5kw(rating as above)=15kw-12kw(per note 1)=3kw+5%=3.15kw+12kw=15.15kw
15.5kw min is this right?

#57852 10/22/05 07:01 PM
Joined: Sep 2005
Posts: 106
J
Member
Note 4 Branch-Circuit Load. It shall be permissible to calculate the branch-circuit load for one range in accordance with Table 220.55. The branch-circuit load for one wall-mounted oven or one counter-mounted cooking unit shall be the nameplate rating of the appliance. The branch-circuit load for a counter-mounted cooking unit and not more than two wall-mounted ovens, all supplied from a single branch circuit and located in the same room, shall be calculated by adding the nameplate rating of the individual appliances and treating this total as equivalent to one range.

5.5+5.5+4= 15
15 ā€“ 12 = 3
3 X 5% = 15%
Demand in column ā€œCā€ is 8, 8 X 115% = 9.2
The demand for these three cooking appliances will be 9,200va


Mike

Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5