Grounding the secondary of a small transformer
Grounding the secondary of a small transformer
(OP)
We have a small 230V device placed in a metal housing.
We are going to display in an exibithion in US and in order not to modify it for 110V, we decided to use a 400VA 110V/230V transformer.
Is it nessecary to ground the secondary of the transformer for safety reasons?
We are going to display in an exibithion in US and in order not to modify it for 110V, we decided to use a 400VA 110V/230V transformer.
Is it nessecary to ground the secondary of the transformer for safety reasons?






RE: Grounding the secondary of a small transformer
Keith Cress
kcress - http://www.flaminsystems.com
RE: Grounding the secondary of a small transformer
10-106 Alternating-current systems (see Appendix B)
(1) Except as otherwise provided for in this Code, alternating-current systems shall be grounded if
(a) by so doing, their maximum voltage-to-ground does not exceed 150 V; or
(b) the system incorporates a neutral conductor.
(2) Wiring systems supplied by an ungrounded supply shall be equipped with a suitable ground fault detection
device to indicate the presence of a ground fault.
We would use a 120:120/240 transformer.
That is; One with a 120 Volt primary and two 120 Volt secondaries which may be connected in series for 240 Volts.
An equally valid option is to use a transformer with a center tapped 240 Volt secondary winding.
Ground the center point.
The maximum voltage to ground will be 120 Volts and you will not need a ground fault detection device.
Bill
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