Open Deadline: April 15 of next year, no extension. Fund Deadline: April 15 of next year, no extension. Annual contribution limit may be affected by the number of months that you have an HDHP in a given tax year. You cannot use HSA funds to pay for expenses incurred prior to opening the account.
In electricity supply systems, an earthing (grounding) system defines the electrical potential of the conductors relative to that of the Earth's conductive surface. The choice of earthing system has implications for the safety and electromagnetic compatibility of the power supply.or measurement purposes, the Earth serves as a (reasonably) constant potential reference against which other potentials can be measured. An electrical ground system should have an appropriate current-carrying capability to serve as an adequate zero-voltage reference level.
An earthing transformer is usually associated with three phase supply systems. Earthing of any electrical system at the source is considered by most countries to be the safer practice with regard to personnel and equipment safety.n earthing transformer provides an earth reference to the power system. This is sometimes done on systems that could become ungrounded under specific fault conditions. This p â¦ revents the need to insulate the conductors to L-L voltage specifications, as well as providing a path for zero sequence current.