An over voltage protection device for a GFCI having a voltage divider network connected across the line terminals of the GFCI, and an over voltage detecting diode connected between the voltage divider network and a gate terminal of an SCR. The engine may further include an inlet control device, such as an electronic throttle, as well as coordination between the inlet and outlet control devices for controlling airflow in the engine. Advantageously, such method also allows to notably increase the amount of optical fiber produced per unit of time with respect to the prior art. When properties of two or more policies affect an entity, properties of policies in higher precedence bindings control properties of policies in lower precedence bindings.