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Peasant: To learn about IECEx certification, visit www.iecex.com. There are many companies our there that will be happy to help you, but you need to know your requirements to help you pick the right one. In summary: - IECEx is a certification based on the IEC 60079 series standards. It is...

AmerCable make VFD cables, up to 777 kcmil [400 sq. mm] according to their catalog. http://www.amercable.com/ Search for 37-102VFD. Probably a special build with a MOQ

IEC 60664-2-1(1997) is a technical report that is supposed to refer to sections in IEC 60664-1(no date specified). I have IEC 60064-1(2007), and the sections stated in 60664-2-1 do not exist in 60644-1. Has anybody come across this and have a document that maps sections and tables in 60664-2-1...

You might want to look at API RP-505. It defines zones around areas of piping, equipment, etc where flammable gas may escape. Once the zones are determined, that then defines the type of electrical equipment that can be located in that zone. Depending on the nature of the escape you have...

IEC 60079-0, General Requirements (www.iec.ch) states in section 29.3 that when multiple types of protection are used, the letters are to be listed alphabetically. If I recall, it used to be the primary type of protections was listed first. The European standard may be similar.

I'm looking for a supplier of hydraulic hose assemblies that are a bit unusual: - working pressure 5500 psi, burst pressure 4x - 3/4" nominal - nominal o.d. 28 mm [1.10"] - 80 C working ambient - 13 m (42 ft) (can be spliced, and exceed the nominal od) - PTFE core - 316 SS braid...

Well, actually, that's were we have our order....but thanks. I guess once they have teeh parts, assembly will be "2 days or less". :-)

I am looking for some military connectors, MIL-C-38999 Series III, but there are a few wrinkles. I have them on order with a supplier now, with a delivery of 20 weeks...I need them in 8 weeks. And to make matters worse, the shells are stainless steel and I'm using optical contacts in these...

This is a good source of information on busbars in general. The CDA recommends petroleum jelly on bare copper for most applications. http://www.cda.org.uk/megab2/elecapps/pub22/index.htm

This link may help. http://www.teledynereynolds.com/product/1singlepin/other/page42.asp

I'll have to see if I can track down those references. I'm not using YC or RCA. I'd need those if I was trying to calculate ampacity from scratch. I'm just trying to adjust for an ambient temperature higher than 40 C. I'm using the equation in the NEC 310-60(C)(4)

Has anybody actually used this equation to adjust the 40 C ampacity values in the tables? If so, what did you use for the Delta TD value? ABS (American Bureau of Shipping) and DNV use this formula in their design rules for LV cables, and use Delta TD = 0.

Yes it is. For cable less than or equal to 2000 V, there is a table of correction factors.

The NEC (NFPA 70) has an equation for converting cable ampacity at 40 C to ampacities at different ambients (Section 310). The equation has a Delta TD = Dielectric Loss Temperature Rise. Where can I find values for this factor? I suspect it's in the IPCEA document referenced, but I don't have...

JAE: Thanks for that. To answer yoru question, we are looking at gas explosions inside steel enclosures for explosion-proof (flameproof) certification.

Anyone have any experience with short duration pressure impulses and the effects they have on steel enclosures? I'm trying to make a "scientific" connection between strain and pressure pulses of less than 1 ms duration. Empirically, a steel enclosure can withstand, without permanent...

A high over-current will tend to blow away the weak connections. This was demonstarted to me during fault testing with dramatic results. But the brushes in this test, and many other we've done, never resulted in brush/shunt falure. We buy copper graphite brushes from Helwig Carbon.

pithpal: The type of mining is relevant. Coal produces gas when mined, so underground mining is special. Surface or hard rock mining is different. Google keywords to get up to speed. If they are looking for a junior engineer, they don't want to pay for a mining expert. Just be aware of the...

cuky2000: Thanks for that. It'll take some time to put it to work, but it's a good, sensible start. I'm thinking these are not your drawings. If they are...triple thanks. Can I have a doc that I can reference?

Dielectric strength for oil is usually measured in accordance with ASTM D877. Spacing is 0.1". For air, we use 8 kV for this distance for design. So dielectric strength is much higher for fluids (35-45 kV). I'm more concerned about creep than clear actually. I'm more concerned with...