[PSES] Serrated head screws for grounding/bonding

2015-02-26 Thread Peter Tarver
Good morning. I am reviewing the suitability of serrated head screws in grounding and bonding applications. I am aware that these screws are good at resisting vibration, but I've not seen them used for grounding and bonding purposes. I question this application since, while the serrations

Re: [PSES] Serrated head screws for grounding/bonding

2015-02-26 Thread Richard Nute
Hi Peter: If the serrated head screw is suitable for a mains circuit connection, it is suitable for a PE circuit connection. The biggest problem is whether a certification house will accept the construction. Be prepared (plan B) to replace the screw with a conventional screw and lockwasher.

Re: [PSES] Serrated head screws for grounding/bonding

2015-02-26 Thread John Woodgate
In message 16ad10a67c6df27b6a7e5fbe13b3c...@mail.gmail.com, dated Thu, 26 Feb 2015, Peter Tarver ptar...@enphaseenergy.com writes: I question this application since, while the serrations oppose loosening of the screw, they do not bite into the metal beneath the head and also seem unlikely to

Re: [PSES] Serrated head screws for grounding/bonding

2015-02-26 Thread Nyffenegger, Dave
I just checked my collection of extra green bonding screws that come with the listed metal junction boxes and lighting fixtures etc. for building wiring (US). Some of them are serrated. They would be used with solid copper or ring terminals. -Dave -Original Message- From: Peter

Re: [PSES] Serrated head screws for grounding/bonding

2015-02-26 Thread Ed Price
Peter: The military doesn’t like that method. I think the primary reason is that the serrations form small point-contact connections, and, under heavy fault current, these little points will melt and/or vaporize. The military prefers a strap which terminates in a flat ring-lug, with the lug

Re: [PSES] Preamplifiers

2015-02-26 Thread John Woodgate
In message 54eedb01.9060...@earthlink.net, dated Thu, 26 Feb 2015, CR k...@earthlink.net writes: A discussion on LinkedIn, in the EMC Experts group, topic RE02 on HF radio with fixed antenna (in Tx), includes a sub-topic about an active rod antenna that sees fairly strong odd-order harmonics

Re: [PSES] Preamplifiers

2015-02-26 Thread CR
On 2/25/2015 12:37 PM, John Woodgate wrote: For example, if you expect to put in impulsive noise you should ask how well the instrument copes with it. A discussion on LinkedIn, in the EMC Experts group, topic RE02 on HF radio with fixed antenna (in Tx), includes a sub-topic about an active