The transformer can, for example, be a power transformer, an audio frequency signal coupling transformer, or {HEAD ~ part} of {TAIL ~ a filter circuit} where it may be that frequency variations or other causes can reduce the load presented by the output to the input to a value which adversely affects safety 
The transformer can , for example , be a power transformer , an audio frequency signal coupling transformer , or { HEAD ~ part } of { TAIL ~ a filter circuit } where it may be that frequency variations or other causes can reduce the load presented by the output to the input to a value which adversely affects safety
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH