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You might want to know the insulation breakdown voltage of these transformers. If the rated insulation voltage is too low, it could fail on a humid day due to the increased voltage between the secondaries, primaries and the iron cores. Many high voltage transformers are rated with ample headroom to accomplish series wiring. Some are not and can fail.

Wiring the secondaries in series places more stress on the secondary insulation because you have double the AC voltage on them. The insulation now has to handle this high voltage AC and prevent it from arcing to the grounded core or the primary. In applications where the insulation rating is marginal or unknown, sometimes the doubler is the best choice.

[QUOTE="Shockwave, post: 323259, member: 10882"] You might want to know the insulation breakdown voltage of these transformers. If the rated insulation voltage is too low, it could fail on a humid day due to the increased voltage between the secondaries, primaries and the iron cores. Many high voltage transformers are rated with ample headroom to accomplish series wiring. Some are not and can fail. Wiring the secondaries in series places more stress on the secondary insulation because you have double the AC voltage on them. The insulation now has to handle this high voltage AC and prevent it from arcing to the grounded core or the primary. In applications where the insulation rating is marginal or unknown, sometimes the doubler is the best choice. [/QUOTE]

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