INSTALLATION MANUAL
Southern Glass Green Energy Industrial Park,
Xinji Village, Machong Town, Dongguan, China.
Tel: 86-769-88288015 Fax: 86-769-88288160
www.csgpvtech.com
V. WIRING AND OVER CURRENT PROTECTION
(a) Wire Type: PV module interconnections should be 90 wet-rated conductors. An allowable wire type is using
USE-2 single conductor cable for exposed applications.
(b) Conductor Ampacity: Correct maximum current and ampacity calculations should be provided
for each circuit. The Ampacity of conductors must be sufficient for application:
1. The maximum PV source circuit current is the sum of parallel module rated short circuit currents
multiplied by 125 percent.
2. The minimum source circuit conductor ampacity is 125 percent of the maximum PV source circuit
current.
3. Minimum photovoltaic output circuit conductor ampacity is the sum of the maximum current of the
parallel source circuits times 1.25.
4. Minimum inverter output circuit conductor ampacity must be equal or greater than the inverter
continuous output current rating times 1.25.
(c) Overcurrent Protection: Necessary fuses or circuit breakers must be properly sized and specified for each circuit.
1. Source circuit overcurrent protection must be sized so that both the PV module and the conductor
from the module to the overcurrent device are properly protected. PV modules must be protected so
that the maximum series fuse rating, printed on the listing label, is not exceeded. It is important to
note that even though the listing label states “fuse” rating, a more accurate term would be the
maximum series overcurrent protection” rating since either a fuse or a circuit breaker may be used to
satisfy this listing requirement. The module may be protected either by installing fuses or circuit
breakers in a series string of modules or by the design of the PV system.
2. Battery (if used) overcurrent protection must have a sufficient voltage and ampere-interrupt rating
(AIR) to withstand the operating conditions of the battery system.
3. Inverter Output Circuit overcurrent protection should be sized and protected according the
manufacturers directions. The circuit and corresponding overcurrent protection should be sized at a
125% of the maximum continuous output of the inverter. The inverter may also have a maximum
allowable overcurrent requirement.
VI. ARRAY MOUNTING WARNING
Before PV array was mounted, the weight of array (pounds per square foot) is including the weight of the modules
and all panelizing hardware (e.g. modules, rails and associated hardware) must be calculated.
(a) If array is roof mounted:
1. If the weight distribution of the system greater than 5 lbs. per square foot, the engineering calculations is
required.
2
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If the roof structure more than 30 years old, specify rafter or truss size and spacing—engineering
calculations may be required if non-standard.
