DS-121 - Single Phase Panel Schedule - May 2024

Sep 26, 2026

Uploaded by Rizky

DS-121 single phase panel schedule for May 2024, detailing building and safety department requirements and bus/breaker configuration for 120/240 and 120/208 systems. Includes codes for load types (lighting, general use receptacles, HVAC, kitchen equipment, miscellaneous, and motors) and guidance on main breaker and fed form lugs for 4-wire and 3-wire arrangements. Provides circuit entries and a panel load calculation method covering connected load definitions and demand load adjustments using specified factors, with notes on converting KVA to amps.

LanguageEnglish

CategoryGeneral

FormatPDF

Pages4

Reading Time2 min

AccessFree to download

Bus Rating and Wiring Configuration

Main Breaker and Fed Form Lugs

Load Codes and Circuit Schedule

Circuit Description and Load Categories

Panel Load Calculation

Connected Load Definitions

Demand Load Calculation Factors

SINGLE PHASE PANEL SCHEDULE Building and Safety Department 1 Town Square, Murrieta, CA 92562 [951-461-6062 www. murrietaca.gov](951-461-6062 www. murrietaca.gov) DS-121 May2024 Bus Rating Single Phase Location Main Breaker ( ) A 4-wire 120/240 Fed form Main lugs Only ( ) A 3-wire 120/208 A/C 10K 14K 18K 22K 25K Fed-thru lugs Iso, GND 42K 65K 100K 150K 200K Double lugs | Circuit Description | | Code | Load (VA) | Breaker | Pole | Bus | Pole | Breaker | Load (VA) | Code | Circuit Description | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | | | | | | A | | | | | | | | 3 | | | | | | B | | | | | | 2 | | 5 | | | | | | A | | | | | | 4 | | 7 | | | | | | B | | | | | | 6 | | 9 | | | | | | A | | | | | | 8 | | 11 | | | | | | B | | | | | | 10 | | 13 | | | | | | A | | | | | | 12 | | 15 | | | | | | B | | | | | | 14 | | 17 | | | | | | A | | | | | | 16 | | 19 | | | | | | B | | | | | | 18 | | 21 | | | | | | A | | | | | | 20 | | 23 | | | | | | B | | | | | | 22 | | 25 | | | | | | A | | | | | | 24 | | 27 | | | | | | B | | | | | | 26 | | 29 | | | | | | A | | | | | | 28 | | 31 | | | | | | B | | | | | | 30 | | 33 | | | | | | A | | | | | | 32 | | 35 | | | | | | B | | | | | | 34 | | 37 | | | | | | A | | | | | | 36 | | 39 | | | | | | B | | | | | | 38 | | 41 | | | | | | A | | | | | | 40 | | | | | | | | B | | | | | | 42 | Code Description L=Lighting R=General Use Receptacles M=Total Motor Load LM=Largest Single Motor S=Dedicated Receptacles H=HVAC K=Kitchen Equipment Z=Miscellaneous or Appliances PANEL LOAD CALCULATION | Date | Manufacturer’s Serial Number: | Panel | | --- | --- | --- | | 120/240 Single Phase 120/208 Three Phase
277/480 | Connected load | Demand load | | --- | --- | --- | | | Connected amps | Demand amps | | Load | Connected Load | Demand Factor | Demand Load | | --- | --- | --- | --- | | Lighting | | X 125% | = | | Gen use receptacles <10 KVA | | X100% | = | | Gen use receptacles >10 KVA | | X 50% | = | | Motors & compressors | | X100% | = | | (Largest) | ( ) | X 25% | = | | Computer receptacles | | X100% | = | | Mechanical & HVAC | | X100% | = | | Kitchen equipment | | X % | = | | Miscellaneous | | | = | | Miscellaneous | | X % | = | Definitions Connected Load 1. The nameplate rating of all appliances that are fastened in place, permanently located to be connected on a specific circuit. (Water heaters, space heaters, ranges, refrigerators, etc.) 2. 180 VA for each general use receptacle 3. Maximum VA of lighting fixtures 4. Full load amps/KVA of all motors from Table 430-247, 248, 249 and 250 of the National Electric Code Demand calculated load The connected load after any code required adjustment factor has been applied. Load calculations shall be submitted/express in KVA and converted to amps when sizing feeders and equipment. THREE PHASE PANEL SCHEDULE | Circuit Description | | WATTAGE | | | CODE | POLE | BRK | BKR | POLE | CODE | WATTAGE | | | Circuit Description | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | CIR | | A | B | C | | | | | | | A | B | C | | CIR | | | | | | | | | | | | | | | | | | | 1 | | | | | | | | | | | | | | | | | 3 | | | | | | | | | | | | | | | 2 | | 5 | | | | | | | | | | | | | | | 4 | | 7 | | | | | | | | | | | | | | | 6 | | 9 | | | | | | | | | | | | | | | 8 | | 11 | | | | | | | | | | | | | | | 10 | | 13 | | | | | | | | | | | | | | | 12 | | 15 | | | | | | | | | | | | | | | 14 | | 17 | | | | | | | | | | | | | | | 16 | | 19 | | | | | | | | | | | | | | | 18 | | 21 | | |

FAQs

What bus ratings and wiring forms are specified for the single phase schedule?

The schedule specifies 120/240 for a main breaker with 4-wire configuration and 120/208 for a fed form with 3-wire configuration, including guidance for A/C feed-thru lugs and double lugs.

Which load categories and codes are used in the DS-121 schedule?

Load codes map categories such as L=Lighting, R=General Use Receptacles, M=Total Motor Load, LM=Largest Single Motor, S=Dedicated Receptacles, H=HVAC, K=Kitchen Equipment, and Z=Miscellaneous or Appliances.

How are connected load and demand load calculated?

Connected load includes nameplate ratings of fixed appliances, 180 VA per general use receptacle, maximum lighting fixture VA, and full-load motor amps/KVA from NEC tables. Demand load applies code-required adjustment factors to connected load, then requires KVA-to-amps conversion when sizing feeders and equipment.

Sep 26, 2026

Uploaded by Rizky