Electrical Level Three -Mod one
NEC Article 210.19
Branch circuit conductors are required to be sized with an ampacity rating that is no less than the Max. load to be carried
Per NEC Article 240.4
Branch circuit overcurrent protection is required to have a rating or setting not exceeding the rating in this code for Conductors,
NEC Article 210.3
Branch circuits are rated by the maximum rating or setting of thr overcurrent devices
NEC Section 210.14
Provides 2 options for calculating branch circuit loads for show window lighting; either using the computed receptacle old of 180VA per receptacle, or computing the load at 200VA per linear foot of show window
NEC Article 210.2
Provides a listing of other code articles for specific-purpose branch circuits.
NEC Sections 210.11(C) and 210.52(F)
Require the installation of at least one receptacle to supply laundry equipment
NEC Sections 210.11(C)(1) and 210.52(B)
Requires at least 2 20A small appliance branch circuits to be installed to supply receptacles installed in kitchen, pantry, breakfast rooms, and dining rooms
NEC Section 210.62
Requires that at least one 125 V single phase, 15A or 20A receptacle outlet be installed directly above a show window for 12 linear feet of window, or major fraction thereof
NEC Section 220.52(A)
Requires that the feeder load be computed at 1,500VA for each required small appliance branch circuit
NEC Sections 220.52(B)
Requires that the feeder load be computed at 1,Load1= Length x Load Amp500VA for each laundry circuit
NEC Chapter 9 Table
Resistance table for Solid Conductors
180VA
Per NEC Section 220.14(I), each outlet is assigned a load of _______.
Noncontinuous Load
Ampacity is 125% of the continuous load before the application of any adjustment or correction factor per NEC Section 210.19(A)
NEC Article 430
Applies to branch circuit supplying only motor load
NEC Article 440
Applies to branch circuits supplying only air conditioning equipment, refrigerating equipment, or both
Continuous load
Are loads that are calculated at 125% of the maximum current rating of the load
125%
Branch Circuits may supply noncontinuous loads, continuous loads, or both. Per NEC Section 210.20(A), the branch circuit rating shall not be less than the noncontinuous load plus ______ of the continuous load
NEC Article 210
Covers branch circuits ( except for branch circuits that supplies only motor loads).
NEC Article 240.3
For Equipment, and
NEC Article 210.21
For Outlet devices including lampholders and receptacles
VD Derating for 3-Phase Circuits
Formula1 VD =(1.732 x L x R x I)/1000 Formula2 VD =(1.732 x L x K x I)/ CM
Continuous load
Is a load whose max current is expected to continue for 3 hours or more
Utilization Equipment
Is defined by NEC as an equipment that utilizes electrical energy.
Single-Phase Branch Circuit Max Load
Is determined by multiplying the rating or setting of the overcurrent protection device (circuit breaker or fuse) by the circuit voltage MaxLoad =Amperage x Voltage
Load Center Length (L)
Load1= Length1 x Load Amp1 Load2= Length2 x Load Amp2 Load3= Length3 x Load Amp3 Total Load = Load1 + Load2 + Load3 Total Load Amp = Load Amp1 + Load Amp2 + Load Amp3 Load Center Length(L)= Total Load / Total Load Amp
Three-Phase Branch Circuit Max Load
Max Load =Amperage x Voltage x 1.732 (Square Root of 3)
3VA/sq ft
The unit lighting load for a barber shop, and a store also
1/4 VA/sq ft
The unit lightng load for a warehouse
NEC Table 310.15(B)
To check on THWN and THHN conductors @ 75 deg C
NEC Chapter 9 Table 8
To look up resistance for # 8 Conductor
Voltage Drop
VD = (2 x L x K x I) /CM
None (0)
What is the number of small appliance branch circuit may serve more than one kitchen?
