onto the network and removing similar speech and or data signals from the network preferably a network conditioning element is used which includes a low pass filter portion for filtering out a low frequency high amplitude mains power signal and a coupling element for input and or removal of telecommunication signals from the network in this way both speech and data signals can be transmitted at carrier frequencies of greater than 1 mhz along a standard electricity distribution and or transmission network which when conditioned provides a larger available spectrum per unit length of network and greater transmission capacity than previously known the quiescent noise level of the conditioned network is also much reduced thus permitting lower signal injection levels for a given signal to noise ratio and a consequential reduction in spurious radiation from the network application_number US 34742794 A description fig1 shows generally a network 40 mains electricity enters the network from an 11 kv transmission line 42 via a transformer 44 and onto a 415v three phase network 46 the 415v three phase network is supplied to a number of locations such as buildings 48 each of these buildings may receive only a single phase electricity supply or alternatively may receive a three phase power supply voice and data signals may be injected into the network or alternatively received from the network at an injection point 50 to be received by users in the premises 48 in order to separate the voice and data communication signals from the low frequency high amplitude power signal each signal destination is provided.