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4200FA Installation and Operation Manual 107
APPENDIX B – Installation Planning Guides
Important Notes:
1. Maximum Current required at Primary AC Input based on full load output and maximum battery
charging current.
2. Output load conductors are to be installed in separate conduit from input conductors.
3. Control wires and power wires are to be installed in separate conduits.
4. Recommended AC input and output overcurrent protection based on continuous full load current
per NEC.
5. Wiring shall comply with all applicable national and local electrical codes.
6. Grounding conductors to be sized per NEC Article 250-122. Neutral conductors to be sized per
NEC Article 310.15.
• Primary AC Input either 3φ, 4-wire + ground, or 3φ, 4-wire + ground.
• AC Output either 3φ, 4-wire + ground, or 3φ, 4-wire + ground.
• DC Input: 2-wire (Positive/Negative) + ground.
7. Power cable maximum size:
• 15/25/30kVA: #1 AWG
• 50kVA: 250 kcmil
• 80kVA: 500 kcmil, Battery Terminals – 600 kcmil
8. Nominal battery voltage based on the use of VRLA type batteries is 2.0 volts/cell (VPC) nominal.
9. Maximum battery discharge current based on lowest permissible discharge voltage of 1.6 VPC.
10. DC wires should be sized to allow not more than a 2-volt drop at maximum discharge current.
11. Weights include internal batteries.
12. Sizing calculations based on the following assumptions:
• Not more than 3 current-carrying conductors installed in steel conduit in ambient temperature
of 86 °F (30 ° C.)
• Temperature rating of conductors and terminals: 167 °F (75 °C.)
• Feeder distance calculations based on NEC Tables 8 and 9 data, allowing for 2% AC voltage
drop.
• Reference: 2002 NEC Handbook. Consult latest edition of applicable national and local codes
for possible variations.
13. Ratings of wires and overcurrent devices are suggested minimums. Consult with a registered
Professional Engineer within your local area for proper size selections.
TOSHIBA INTERNATIONAL CORPORATION
13131 West Little York Road
Houston, TX 77041
Telephone: 800.231.1412; 713.466.0277
Fax: 713.896.5212
Corporate Web Site: www.tic.toshiba.com
Group Web Site: www.toshibaups.com