SAFETY VOLT SWIMMING POOL TRANSFORMERS ARE MANUFACTURED 
WITH  MODELS THAT HAVE 12 VOLT OUTPUTS  AND MODELS THAT HAVE MULTIPLE OUTPUTS OF 12, 13  AND 14 VOLTS. THE SIZE OF THE WIRE USED TO CONNECT THE TRANSFORMER TO THE LIGHT FIXTURE AND THE LENGTH OF THE WIRE RUN WILL DETERMINE WHICH OUTPUT VOLTAGE  SHOULD  BE USED TO DELIVER A FULL 12 VOLTS TO THE LIGHT.

TO SELECT THE PROPER OUTPUT VOLTAGE ON A MULTIPLE  TAP UNIT, USE THE VOLTAGE TAP SELECTION CHARTS FOR THE WIRE SIZE BEING USED.  SWIMMING POOL LIGHTS ARE USUALLY  INSTALLED WITH  NO. 12, NO. 10 OR NO.  8  GAUGE WIRE.

USING THE CHART FOR THE WIRE SIZE BEING USED, FIND THE LOCATION ON THE CHART WHERE THE TOTAL LAMP WATTAGE COLUMN AND THE DISTANCE TO LIGHT ROW INTERSECT.  FOR EXAMPLE, IF THE DISTANCE BETWEEN THE TRANSFORMER AND THE LIGHT FIXTURE IS 75 FEET AND NUMBER 10 WIRE IS BEING USED, THE CHART SUGGESTS USING THE 13 VOLT OUTPUT TAP.