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Lighting Current Limiter
By: Hilmi Tannous
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Lighting Current Limiters
Supplementary circuit breakers, designed to limit available wattage
based on the actual lighting design criteria, thereby avoiding the
“watts-per-linear-foot penalty” imposed by energy codes while
maintaining track lighting density, performance and configuration
flexibility.
What is a Current Limiter
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Lighting Current Limiters
• To limit the size of the electrical service
• NEC 220.43(B) requires 75W per linear foot for service calculations.
• By using current limiter you can use the track load as a typical lighting
load.
Why use Current limiters
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Lighting Current Limiters
• Required by local Codes:
• California Title 24.
• City of Seattle Energy Code.
• City of Denver Energy Code.
Why use current Limiters (cont.)
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• To help meet local codes:
• IEEC and ASHRAE 90.1 requires 30-watts per linear foot.
• California Title 24 requires 45-watts per linear foot.
• City of Seattle Energy Code requires 70-watts per linear foot.
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Lighting Current Limiters
• Standard layout without current limiters
• 100’ of track and (32) 39W CHM (45W total fixture wattage).
• 32x45=1440W connect load.
• Using track length wattage calculations: 100x45 (based on T24)=4500W.
Example
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Lighting Current Limiters
• Revised layout using short track segments without current limiters
• 64’ of track and (32) 39W CHM (45W total fixture wattage).
• 32x45=1440W connect load.
• Using track length wattage calculations: 64x45 (based on T24)=2880W.
Example (cont.)
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Lighting Current Limiters
• Original layout using current limiters
• 100’ of track and (32) 39W CHM (45W total fixture wattage).
• 32x45=1440W connect load.
• Using Current limiter wattage calculations: 4x480=1920W.
Example (cont.)
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Lighting Current Limiters
• Track mounted current limiters
• End Feeds, 1-ckts and 2-ckts
• In-Line Feeds, 1-ckts and 2-ckts
Types of current Limiters
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Lighting Current Limiters
• Current limiting panel
• LC&D Sliver Bullet
• Current limiting for up to 12 Ckts (Mini) and up 21 ckts
• Current limiting available from 1-8, 10,13 & 15 amps (80% rated).
• Compact Sizes 12" w x 18" h x 4" d or 12″ w x 12″ h x 4″ d
Types of current Limiters (cont.)
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Lighting Current Limiters
• Current limiting panel
• Cooper Greengate TracKeeeper
• Current limiting for up to 16 Ckts (Mini) and up 32 ckts
• Current limiting available: 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 10, 13, 15, 16, 20, 25, 30,
32, 40, 50, 60. (80% rated)
• Available in 120V and 277V.
Types of current Limiters (cont.)
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Lighting Current Limiters
• Current limiting panel
• Juno Trac-Master
• Available sizes: 1-12 Ckts (Mini), 6-21 Ckts (standard), 22-42 Ckts (large),
• Current limiting available: 1A, 2A, 3A, 4A, 5A, 6A, 7A, 8A, 10A, and 13A. (80%
rated)
• Available in 120V and 277V.
Types of current Limiters (cont.)
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Lighting Current Limiters
• Individual current limiter cost $50-$60
• LC&D Sliver Bullet mini panel cost approximately $2000
• Use Individual current limiter on smaller spaces like Sunglass Hut.
• Use a current limiting panel on larger stores like F21, casual male.
Current Limiter vs. Current limiting Panel
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Lighting Current LimitersCONCLUSION . . .
THANK YOU.
