Ron,
Shooting from memory here... the T220 was rated at 2800 watts max, as
compared to the later T240, which is rated at 3900 watts continuous. At
240 VAC 2800W is just a bit over 10A. Given that use as a balancing
autotransformer for a generator is continuous duty, this capacity rating
is most likely due to how much heat it can tolerate. Given this the 15A
fusing seems quite appropriate and I wouldn't change it.
Allan
*Allan Sindelar*
[email protected] <mailto:[email protected]>
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*
**
On 10/25/2016 5:53 PM, RM You wrote:
Hi Wrenches, looking for help from someone who remembers the old T220
Autotransformer from Trace. I have a used one and it came with built in 15a
fuses which seem small. I’m wondering if the size of the transformer actually
changed with the T240 subsequent version or if the 25a breakers in the T240
were just considered a more acceptable design component for the time. Bottom
line is would it be advisable to change out the built in 15a for a higher
rating to use this as a balancing transformer on 240v output from a generator.
Ron
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