James231
Member
- Location
- San Francisco, CA, USA
Hi. We are working on a kitchen remodel in a brand new building in San Francisco. They want to upgrade all appliances and believe they need 175A service. The unit is only 550 sq.ft., but they are installing all high-end appliances, including induction cooktop, Miele ovens, 2 undercounter SubZero fridge/freezer drawers, etc. The unit was originally set up with 100A service on three wires (supposedly single phase).
The building is 208Y 120V 3 phase 4 wire supplied by PG&E to the each of 5 main panels rated at with 800A 120/240V rating. Each main panel services 5 separate units.
The conduit between the main panel and the unit subpanel is 1?" EMT conduit with about five 90? elbows and two 135? elbows for about a total run of 75'-100'.
The conductor is #2 AWG copper stranded wire with THHN sheath.
The appliances the client has includes the following:
Fridge/Freezer combo (Sub-Zero ID30C): 115V/3.5A/60Hz/420W (15A circuit)
Fridge (U-Line U-3018RF): 115V/2.4A/60Hz/290W (15A circuit)
Dishwasher (Miele G 4580 SCVi): 120V/12.5A/60Hz/1,500W (15A circuit)
Hood (Zephyr arc duo): 120V/7A/60Hz/840W ... draws 7A with blower & light (15A circuit)
Oven (Miele H6800BM): 208-240V/22A/60Hz/5,300W (25A circuit)
Cooktop (Bosch NITP066UC): 208-240V/30A/50-60Hz/7,200W (30A circuit)
Drier (GE DCVH480EKWW): 240V/24A/60Hz/2,200W (25A circuit)
Washer (GE WCVH4800KWW): 120V/10A/60Hz/1,200W (15A circuit)
Towel Warmer (Virtu VTW-128A-BN): 120V/0.67A/60Hz/80W (part of bathroom 15A GFCI circuit)
Kitchen GFCI: (20A circuit)
Bathroom GFCI: (15A circuit)
Bedroom plugs: (15A circuit)
Living room plugs: (15A circuit)
Lighting: (15A circuit)
Consumer Electronics (Apple Magsafe): 120V/1.5A/85W
(Apple iPad charger): 120V/0.45A/10W
(Grandstream CCTV): 0.4A/50W
(Apple Time Capsule): 120V/0.25A/30W
(Apple Cinema Display): 120V/0.75A/90W
(Medella Pump In Style breast pump): 120V/0.15A/18W
(Revlon hair dryer): 120V/16A/1,875W
Ceiling LED Lights (average guestimate at 12 total): 24W*12 ? 288W = 2.4A
======================================================================
Max theoretical demand ? 43A @ 120V (plus 16A hairdrier) + 76A @ 240V
or, max of 21,475W
Am I on the right track here? What is the total ampacity of the #2 AWG conductor? How much will the client need to cut back (if any) on the appliances, if we don't upgrade the service wire? Unfortunately, the conduit runs through a medical office, and it will cost a lot in access fees and be a huge hassle for us to get to the conduit pull boxes. So, we hope to stick with the existing wire, if possible. Thanks!
The building is 208Y 120V 3 phase 4 wire supplied by PG&E to the each of 5 main panels rated at with 800A 120/240V rating. Each main panel services 5 separate units.
The conduit between the main panel and the unit subpanel is 1?" EMT conduit with about five 90? elbows and two 135? elbows for about a total run of 75'-100'.
The conductor is #2 AWG copper stranded wire with THHN sheath.
The appliances the client has includes the following:
Fridge/Freezer combo (Sub-Zero ID30C): 115V/3.5A/60Hz/420W (15A circuit)
Fridge (U-Line U-3018RF): 115V/2.4A/60Hz/290W (15A circuit)
Dishwasher (Miele G 4580 SCVi): 120V/12.5A/60Hz/1,500W (15A circuit)
Hood (Zephyr arc duo): 120V/7A/60Hz/840W ... draws 7A with blower & light (15A circuit)
Oven (Miele H6800BM): 208-240V/22A/60Hz/5,300W (25A circuit)
Cooktop (Bosch NITP066UC): 208-240V/30A/50-60Hz/7,200W (30A circuit)
Drier (GE DCVH480EKWW): 240V/24A/60Hz/2,200W (25A circuit)
Washer (GE WCVH4800KWW): 120V/10A/60Hz/1,200W (15A circuit)
Towel Warmer (Virtu VTW-128A-BN): 120V/0.67A/60Hz/80W (part of bathroom 15A GFCI circuit)
Kitchen GFCI: (20A circuit)
Bathroom GFCI: (15A circuit)
Bedroom plugs: (15A circuit)
Living room plugs: (15A circuit)
Lighting: (15A circuit)
Consumer Electronics (Apple Magsafe): 120V/1.5A/85W
(Apple iPad charger): 120V/0.45A/10W
(Grandstream CCTV): 0.4A/50W
(Apple Time Capsule): 120V/0.25A/30W
(Apple Cinema Display): 120V/0.75A/90W
(Medella Pump In Style breast pump): 120V/0.15A/18W
(Revlon hair dryer): 120V/16A/1,875W
Ceiling LED Lights (average guestimate at 12 total): 24W*12 ? 288W = 2.4A
======================================================================
Max theoretical demand ? 43A @ 120V (plus 16A hairdrier) + 76A @ 240V
or, max of 21,475W
Am I on the right track here? What is the total ampacity of the #2 AWG conductor? How much will the client need to cut back (if any) on the appliances, if we don't upgrade the service wire? Unfortunately, the conduit runs through a medical office, and it will cost a lot in access fees and be a huge hassle for us to get to the conduit pull boxes. So, we hope to stick with the existing wire, if possible. Thanks!