INSTALLATION NOTES:
Low-Voltage System Layout
HL-015 3/18
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Circuiting Guidelines:
Lo
ads P
er Cable
Add cable runs as necessar
y
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Close-Zone 0–40' using voltage tap 12
Mid-Zone 40–80' using voltage tap 12
Far-Zone 80–120' using voltage tap 13
Out There-Zone 120–160' using voltage tap 14
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12 180 watts max. 10 300 watts max.
12 95 watts max. 10 150 watts max.
12 100 watts max. 10 160 watts max.
12 110 watts max. 10 175 watts max.
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These installation guidelines are to assist you in correctly installing luminaires and transformers. For any questions, call Holm Technical Support
at 877-848-9329 before proceeding. Follow all NEC guidelines and local electrical codes. For more information, visit: holmlighting.com
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Single Transformer
When using only one transformer, it is very important to center the transformer on the wattage
load. If the project calls for 135 watts in both front and back areas, the transformer should be
centered on the side of the project that will receive the most lighting. A common mistake is to
locate the single transformer on the service side or in the utility closet, which might result in
excessively long cable runs to reach lighted areas. The primary goal in laying out low-voltage
systems is to minimize cable runs because of voltage drop and cost.
Multiple Transformers
A common mistake in laying out multiple transformer circuits is to group several transformers
in one location because of utility or visual considerations only. As with any low-voltage layout,
the prime directive should be to locate the transformers as close to the luminaires as possible in
order to minimize cable runs. The other multi-transformer layout consideration is “use zoning.”
Having several transformers allows the client to selectively control light in separate areas. This
design approach is to individually control areas that have similar needs. In lighting, a recreation
area has different lighting needs than does a front entry. Therefore, the lights that serve these
different lighting use areas need to be on separate transformers and switch controls. Use of
the ZDlink or ZDCLink transformer offers the alternative solution, allowing zoning and dimming
capabilities on a single transformer.
Sample diagram with transformer placement
Transformers:
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For maximum light output, tune lighting circuits to provide
between 10 and 15 volts as measured at the luminaire when
all of the loads on the circuit are operating.
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Voltage can be regulated by adjusting circuit load/run.
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To determine circuit voltage, use a digital voltmeter.
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Connectors used to connect a luminaire or output circuit component
to the main low-voltage cable shall be copper or copper alloy, or the
equivalent.
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When installed, the connection shall guard against inadvertent shorting
of current-carrying parts.
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Wire nuts are not to be used unless provided with corrosion protection,
intended for outdoor use, and designed for direct burial.
LED Life:
Connectors:
