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| Subject - Maximum CB for Main & Sub-Panels | |
| bobbear | For a new 400A residential service feeding 2-200A main panelboards. In addition to the direct loads for these panelboards CB's there will be 2-100A sub-panels from each main panelboard to reduce the quantity of long homeruns. Please direct me to any code reference which may limit the maximum quantity of CB's for this layout and limit the quantity of available spare spaces. The current plan is to use a 42 space main panelboard and 24 space 100A main lug sub-panels. Natural gas is to be used for heat, H/W, dryer, pool heater. All other loads are electric. |
| cs409 | before we get started on this,,,,just for fun/and for requirements LOL.....what size is the house(sq ft), , how many bedrooms, and while we are at it....garage size,,,attached or detached? etc etc....u mentioned pool? would help to know the figures on the pump etc... bottom line, we will want to do a dewling load calculation ok............best to u and welcome to the forum....casey,,,,ps...need to know how far the run/s will be from main to sub panels ok.... |
| Ryan_J | 408.15 |
| bobbear | The house has 4662 sq ft of main living space with 3 bedrooms and 3 1/2 baths. There is also a sunroom with a hot tub and indoor pool for an additional 1176 sq ft. Seperate HVAC for both areas. Dehumidification for the sunroon is a part of the HVAC package. The garage space is 3744 sq ft. This is to be only partially heated to 40F with H/W baseboard. Provision for 4 tons of cooling to be added in the future with a seperate HVAC system. This is a high ranch style house. The garage and sunroom spaces occupy most of the lower level. The hot tub has a 1 1/2 hp pump and H/W coil for heat. The pool will have a 1hp filter pump, 5hp current generating pump and a H/W coil for heat. 2-3 ton A/C units with a 120K BTU gas furnace each for the main space and 1-3 ton unit with a hot water coil for the sunroom. A 200K BTU gas H/W boiler. One gas clothes dryer. One regular electric stove. One regular gas stove. Two dish washers. Two microwave ovens. A 1 1/2 hp sewage ejector. A 1 hp sump pump. A 40A 240V circuit for an arc welder. A 30A 240V circuit for an air compressor. The special portions of the lighting have 3.4 KW for the sunroom and 4.7KW for outdoor lighting. The balance of the lighting load is standard and was lumped into the 3W/sq ft. There will be a 15KVA generator with manual transfer only (go figure) connecting to all loads for emergency. The sub-panels are about 80 ft away as the cable wiggles. Receptacles will be 6ft OC including the garage area. The kitchen will be 2 ft OC on the countertops. The sunroom is receptacle challenged due to all the water but still has 4-20A receptacle circuits. Many of the sunrooms receptacles are up high for holiday lighting visible from the exterior. The exterior has 4-20A circuits for holiday lighting in addition to the other lighting loads. All this eats up a lot of panelboard spaces. |
| JimmyDee | quote: |
| JimmyDee | What it looks like he wants to do here is provide a 400 amp service. 2 set of 4/0 from the meter box feeding 2, 200 amp Sq D panels. Also want to add 2 remote 100 amp panels in the far reaches of this $2 million house. Question, to comply with all the service disconnect breakers being in one box/panel (exception allows separate panels if fed separately from meter) could he feed (One from each panel) the 2-100 amp disconnects that will feed the remote 100 amp panels from the 200 amp panel, buss after the main disconnect. Sorry if wordy. Jim |