From: =?iso-8859-1?Q?Juan_Pedro_Pe=F1a?= <[email protected]> Doug: At least in Spain, public switching telephonic network works with 48 V = dc but the ringing signal could reach 75 V ac (hazardous voltage = according to LVD). In fact, if you catch both poles of a telephone line = during the ringing process, you will suffer that voltage. So for that = reason, LVD applies.
---------- De: Doug McKean[SMTP:[email protected]] Enviado: lunes 10 de febrero de 1997 21:05 Para: Juan Pedro Pe=F1a Cc: [email protected]; [email protected] Asunto: Re: BS EN 41003: 1997 now available I'll throw in two cents worth.=20 We have been having a discussion concerning where standards=20 do and do not fit in to particular pieces of equipment.=20 I have had discussions in the past with people about=20 48VDC TTE products and the LV Directive - 73/23/EEC. =20 The LVD specifically states in Article 1=20 "For purposes of this Directive 'electrical equipment' means=20 any equipment designed for use with a voltage rating of=20 between 50 and 1000V for alternating current and between=20 75 and 1500V for direct current, other htan the equipment=20 and phenomena listed in Annex II."=20 Annex II goes on to list=20 "EQUIPMENT AND PHENOMENA OUTSIDE THE SCOPE OF THE DIRECTIVE Electrical equipment for use in an explosive atmosphere=20 Electrical equipment for radiology and medical purposes=20 Electrical parts for goods and passenger lifts Electricity meters Plugs and socket outlets for domestic use=20 Electric fence controllers=20 Radio-electrical interference" Now, even when TTEs operating at 48vdc allow for a=20 Bellcore lower/nom/upper limit of 42.4/48/56.5 tolerance,=20 those dc TTEs are not covered by the lower=20 75vdc limit of the LVD.=20 So that 115/230 VAC TTEs were included, but=20 the 48VDC versions of the same model weren't. Comments?=20 I'd really like to know how wrong I am. This was the basis=20 of one of those really terrible debates I had with a former boss=20 where I wrote him up in a memo to his boss.=20
