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Circuit breaker panel capacity
Here is a general question, I am planning a project and will eventually get
all proper permits but I want some advice to determine if this step is necessary I am planning to install a steam room in a new bathroom and it requires a 35A, 220V dedicated breaker. My house has a 100A service panel with one 50A to the range, one 35A to the drier and about a dozen 20A wall plug circuits. The question is: Is it likly that I will need to simultaniously upgrade the service panel to 150A when adding this circuit? What is the rule about the maximum capacity of a service panel? I know it depends on where I live (CA) etc. I am just looking for direction before I go in for permits and get rejected for omitting something important. |
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AutoTracer wrote:
Here is a general question, I am planning a project and will eventually get all proper permits but I want some advice to determine if this step is necessary I am planning to install a steam room in a new bathroom and it requires a 35A, 220V dedicated breaker. My house has a 100A service panel with one 50A to the range, one 35A to the drier and about a dozen 20A wall plug circuits. The question is: Is it likly that I will need to simultaniously upgrade the service panel to 150A when adding this circuit? What is the rule about the maximum capacity of a service panel? I know it depends on where I live (CA) etc. I am just looking for direction before I go in for permits and get rejected for omitting something important. The service load needs to be calculated per NEC 220-31. Add up the numbers and see what you get. 220-31. Optional Calculation for Additional Loads in Existing Dwelling Unit For an existing dwelling unit presently being served by an existing 120/240-volt or 208Y/120- volt, 3-wire service, it shall be permissible to compute load calculations as follows: Load (kVa) Percent of Load First 8 kVA of load at 100 Remainder of load at 40 Load calculations shall include lighting at 3 volt-amperes/ft2 (0.093 m2); 1500 volt-amperes for each 2-wire, small-appliance branch circuit and each laundry branch circuit as specified in Section 220-16; range or wall-mounted oven and counter-mounted cooking unit; and other appliances that are permanently connected or fastened in place, at nameplate rating. If air-conditioning equipment or electric space-heating equipment is to be installed, the following formula shall be applied to determine if the existing service is of sufficient size. Air-conditioning equipment* 100% Central electric space heating* 100% Less than four separately controlled space-heating units* 100% First 8 kVA of all other loads 100% Remainder of all other loads 40% *Use larger connected load of air conditioning and space heating, but not both. Other loads shall include the following: 1. 1500 volt-amperes for each 20-ampere appliance circuit 2. Lighting and portable appliances at 3 volt-amperes/ft2 (0.093 m2) 3. Household range or wall-mounted oven and counter-mounted cooking unit 4. All other appliances fastened in place, including four or more separately controlled spaceheating units, at nameplate rating |
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