NEBS questions

Hello Group: I am glad to see the recent NEBS related discussions. I find them interesting and relevant. So while I am thinking about NEBS, I thought I'd ask a couple of questions. I would like to understand more clearly the relationship between Central Offices and local building codes. I

Stumped

Forum, I have made some measurements and gotten results which are at odds with my intuition. I am wondering if someone out there can shed some light on this subject. I was interested in the losses associated with rf traveling on a twisted shielded pair cable. The scenario is that a length of

RE: NEBS Level 3 Plus

Richard, Verizon does not recognize “NEBS Level 3” as called out in Telcordia/Bellcore SR-3580. They had input into this document, but later regretted it. What Verizon does recognize is their own checklist at www.verizonnebs.com http://www.verizonnebs.com/ . The confusion comes from the fact

Re: Ground potential differences

The worst case of ground potential difference that I have heard of is a case where guy got a shock from the grounded metal reflector of his trouble light while working outside on his car. Turns out the pump in his neighbor's well (fed from the same transformer) had a short from from

RE: NEBS Level 3 Plus

About 6-7 years ago when I was getting ready to go through NEBS for the first time, I found it to be confusing and in some cases daunting. At that time, Bellcore (now Telcordia) put on a NEBS seminar with a NEBS rep from each of the operating companies. That seminar proved to be the key that

Re: Ground potential differences

I've no publications, but I did have personal experience with the more destructive results with ground potential differences. At another company, I witnessed the insulation of a coax cable melting after being connected between equipment in a lab where I worked. The problem being a difference in

NEBS Level 3 Plus

Greetings All, Does anyone know the specifics regarding Verizons NEBS Level 3 Plus requirement. I have checked the Verizon web pages, the archives of the emc-pstc, and the word search on the internet, with no luck. Otherwise, I believe this is just another name for the checklist document that

RE: Ground potential differences

Most earth potential differences come from load currents. Leakage currents don't usually add up to very much. Electrical installations should have one neutral to earth connection at the source of the system (at the transformer or service entry). However many electrical installations have branch

CPE Telecom Equipment in Manitoba, Canada

Dear All, Has anyone heard of Canadian Manitoba provincial exemption regarding CPE Telecom Equipment supplied by a Class 2 transformer or power supply? This e-mail message may contain privileged or confidential information. If you are not the intended recipient, you may not disclose, use,

Re: LED's and laser safety?

I read in !emc-pstc that richwo...@tycoint.com wrote (in 846BF526A205F8 4BA2B6045BBF7E9A6A04675859@flbocexu05) about 'LED's and laser safety?' on Mon, 14 Oct 2002: I sure would love to hear that argument. Just get a time machine and go back to the meeting of the IEC TC85 working group on the

creepage et seq/spoof

In the interests of my own credibility on the board (if I have any?) I should wave the white flag of surrender and own up to having posted a nonsense message on Oct 9th in response to the genuine request for information about creepage limits. For some inexplicable reason my 'funny bone' was

RTTE - receive only equipment

As far as I understand the RTTED, the directive also applies to radio receive-only equipment. But are we required to notify it for each member state within EU, if it use non-harmonized frequency bands ? Best regards Amund Westin, Oslo / Norway --- This

RE: LED's and laser safety?

I sure would love to hear that argument. Richard Woods Sensormatic Electronics Tyco International -Original Message- From: Warren Birmingham [mailto:war...@comfortjets.com] Sent: Friday, October 11, 2002 6:06 PM To: emc-p...@ieee.org Subject: Re: LED's and laser safety? Gary, I was

RE: Testing for dry joints - :)

Scott asks .. So I give up - just what exactly is a dry joint? Dry joint: Electrical context: - A solder joint in which the electrical connection between two conductors has been poorly formed by the solder material; a consequence of incomplete formation or surfaces not properly wetted by the

RE: Filtered D Types.

Many thanks for all your help. Best regards, David Sproul.

RE: Record Retention

Randall, As Fred Borda pointed out, for Australia (both C-Tick and A-Tick) is 5 years for all documentation held in the product Compliance Folder starting from the time the device is no longer supplied in Australia. NOTE This may be different to being considered obsolete. In addition, if there

Filtered D types and ground potential

1.Filtered D can be obtained from Cinch who also have filter blocks that can be added as a retro-fit. ITT Cannon also supply connectors under their D*JK series. Many years ago as an apprentice, I needed to use more test equipment than sockets on the bench permitted. Placing a piece of test

RE: coax grounding of E3/DS3 in the EU

Look on the last version of ITU-T G.703. IN this the clause to isolate the RX side was deleted. Bye Paolo _ Paolo Gemma Siemens Mobile Communications S.p.A. PG MW ST EMC Safety SS Padana sup. KM 158 20060 Cassina de' Pecchi (MI) Italy phone