Category Archives: Wire & Cable

Business update

Good evening,

MEMORANDUM ON IDENTIFICATION OF ESSENTIAL CRITICAL
INFRASTRUCTURE WORKERS DURING COVID-19 RESPONSE

As a supplier to programs that support the department of defense, Silver State Wire & Cable will remain operational until further notice. Under the current circumstances with COVID-19, we are not open to public visitation but we are processing orders, manufacturing, and shipping.

Should you have any questions please feel free to call or email us. Our normal business hours (Monday through Friday from 8am to 5pm PDT) are still in effect.

Thank you for your support, and please be safe.

Josh Lee

President

Nexans (Elm City, NC. Plant) closing

Effective, June 30th, 2016 the Nexans manufacturing plant in Elm City, North Carolina, will be closing.

Nexans manufactures aerospace wire and cable: AS22759 and M27500 products. A few months prior, they also announced they would not be producing AS81044 style wire.

Rest assured though. We purchase wire and cable from multiple QPL approved manufacturers to avoid events such as this causing drastic issues with the supply of mil-aero products.  We are confident that our existing supply chain will be able to support the demands where Nexans was included.

If for some reason, Nexans was your preferred manufacturer for any wire or cable products, we would be happy to discuss a solution with you and your engineering, production, and quality teams.

Thank you for your continued business, and have a great weekend!

Josh Lee

RSCC Aerospace & Defense to transition to Marmon Aerospace & Defense.

Marmon Aerospace Letter 2015

As you may know RSCC Aerospace & Defense™ has operated as a legal division of RSCC Wire & Cable LLC since 2009. This has created unnecessary complexity and confusion for both organizations. In response while also keeping in mind their long term business objectives RSCC has created the legal entity, Marmon Aerospace & Defense LLC, a member company of, Marmon Engineered Wire & Cable LLC. As they make this transition they will continue to do business under the trade name RSCC Aerospace & Defense™. You will see the new legal name appear in any required legal documents and may occasionally see the associated logo on promotional material. This change will take effect January 1, 2016.

We look forward to providing you with the same high levels of product from RSCC Aerospace (Soon to be Marmon Aerospace & Defense) through this transition. If you have any questions or concerns please do not hesitate to contact us.

Thank you for your continued business. We look forward to another successful year and wish you the very best.

Josh Lee
Vice President

14 Ways to be more positive at work

  1. During The Commute

Listen to audio books, podcasts, or inspirational music on your commute both to, and from your workplace. This will help you get ready for the day, as well as unwind on your way home.

  1. Arrive Early

Arrive early and focus on the tasks required for the day. Who knows, you might even get done early and have time to get prepared for your next tasks in line.

  1. Break Times

Use this time to celebrate your achievements so far, or possibly re-focus your day. Try to avoid using your break as time to get caught up.

  1. “Meeting” Options

Walking meetings help focus. Maybe not all can be in an extra-curricular environment, but one meeting like this a day could help. Also, try to leave any meeting with clear and achievable objectives.

  1. Health & Well Being

Exercise is proven to reduce stress and the resulting feel good factor can boost your productivity, while leaving you in a healthy mindset. Add some quick calisthenics to your day to keep your chi in the right place.

  1. Pace Yourself

Rushing tasks will create more errors that are inevitably more work fixing in the long run. This doesn’t mean you should slow down. Find your tempo and try to stick with it throughout the day.

  1. Support

Share your achievements with others and support their work as well. Team building is the key to a successful work group.

  1. Be Positive

Infuse genuine, positive emotions into your work and colleagues. Enjoy the contagious nature.

  1. Compassion

Remain compassionate to negative colleagues. People are usually negative for a reason. Perhaps they need to see or hear your good attitude to get out of a slump.

  1. Collaboration

Never be afraid to ask for help. Collaborate with others to achieve mutual goals.

  1. Office Politics

Don’t get bogged down with office politics. Focus on your tasks and what is needed of you.

  1. Boring Jobs

Bite the bullet and face the mind numbing tasks head on. This will get you through them and on to the things you like doing most.

  1. Constructive Criticism

Understand any criticism aimed at you and use the feedback to improve you own work. A winning team has a coach or coaches who critique their players as much as possible.

  1. Adapt

Business changes and you must adapt in order to survive. Make sure you are open and adaptable rather than resisting change. Better yet, stay ahead of the curve and keep an eye and ear on what changes may be coming. You could even talk about it at your next meeting.

Last of all, “Good job!”

Josh Lee

 

Captain!.. Activate the force SHIELD!

LLstrandedLg

(Ex: Low Loss Coaxial Cable with a braid, foil, and a flat braid)

In environments where electrical noise is a factor. A Shielded cable is needed to prevent interference. Electromagnetic interference (EMI), whether it be radiated or conducted, can seriously disrupt the proper operation of other equipment. Jacket insulation protects a cable mechanically from scraps and abrasion and environmentally from moisture and spills, but insulation is transparent to electromagnetic energy and offers no protection. This is when shielding is needed to combat the effects of Electromagnetic interference.

In most cases, cables can be a main source of transfer for EMI, both as a source and receiver. As a source, the cable can either conduct noise to other equipment or act as an antenna radiating noise. As a receiver, the cable can pick up EMI radiated from other sources. A shield works on both.

The table below has basic rules as to the areas that are subject to these noise levels. Notice that switching heavy loads, inductive heaters, large transformers can all present high levels of both conducted and radiated EMI.

Placing signal cables next to power cables can also allow power-line noise to couple onto the signal lines.

Noise Level Noise Source Wire Specification
High Electrolytic processes, heavy motors, generators, transformers, induction heating, relay controls, power lines and control wire in close proximity Heavy processing plants such as steel mills and foundries
Medium Wiring near medium-sized motors, control relays Average manufacturing plants
Low Wiring located far from power lines, motors; motors <5 hp; no induction heating, arcs, control or power relays nearby Storage areas, labs, offices and light assembly operations

The primary way to combat EMI in cables is through the use of shielding. The shield surrounds the inner signal- or power-carrying conductors. The shield can act on EMI in two ways. First, it can reflect the energy. Second, it can pick up the noise and conduct it to ground. In either case, the EMI does not reach the conductors. In either case, some energy still passes through the shield, but it is so highly attenuated that it does not cause interference.

Cables come with various degrees of shielding and offer varying degrees of shielding effectiveness. The amount of shielding required depends on several factors, including the electrical environment in which the cable is used, the cost of the cable—why pay for more shielding than you need?—and issues like cable diameter, weight, and flexibility.

An un-shielded cable for industrial applications typically is used in a controlled environment— inside a metal cabinet or a conduit, where it is protected from ambient EMI. The metal of the enclosure shields the electronics inside.

A shield will reflect some energy, conduct some energy to ground, and pass some energy. There are two types of shielding typically used for cables: foil or braid.

  1. Foil shielding used a thin layer of aluminum, typically attached to a carrier such as polyester to add strength and ruggedness. It provides 100% coverage of the conductors it surrounds, which is good. It is thin, which makes it harder to work with, especially when applying a connector. Usually, rather than attempting to ground the entire shield, the drain wire is used to terminate and ground the shield. The drawback to foil is that is may not be as flexible as the braid shield.
  2. A braid is a woven mesh of bare, tinned copper, or silver plated copper wire strands. The braid provides a low-resistance path to ground and is much easier to termination by crimping or soldering when attaching a connector. But braided shields do not provide 100% coverage. They allow small gaps in coverage. Depending on the tightness of the weave, braids typically provide between 70% and 95% coverage. When the cable is stationary, 70% is usually sufficient. In fact, you won’t see an increase in shielding effectiveness with higher percentages of coverage. Because copper has higher conductivity than aluminum and the braid has more bulk for conducting noise, the braid is more effective as a shield. But it adds size and cost to the cable.

For very noisy environments, multiple shielding layers are often used. Most common is using both a foil and a braid. In multi-conductor cables, individual pairs are sometimes shielded with foil to provide cross-talk protection between the pairs, while the overall cable is shielded with foil, braid, or both. Cables also use two layers of foil or braid.

In practice, the purpose the shield is to conduct to ground any of the noise it has picked up. The importance of this cannot be overstated—and failure to understand the implications can mean ineffective shielding. The cable shielding and its termination must provide a low-impedance path to ground. A shielded cable that is not grounded does not work effectively. Any disruptions in the path can raise the impedance and lower the shielding effectiveness.

Practical Guidelines for Effective Shielding

  1. There must be the proper amount of shielding required for the application. In moderately noisy environments, a foil alone may provide adequate protection. In noisier environments, consider braids or foil-braid combinations.
  2. Make sure the cable fits the application, not the other way around. Mainly in situations such as robotics, cables that experience repeated flexing usually can be built with a spirally wrapped shield rather than a braid. in these situations, be sure to avoid foil shielding as the flexing could tear the foil shield.
  3. Confirm the equipment that the cable is connected to is properly grounded. Use an earth ground wherever possible and check the connection between the ground point and the equipment. Eliminating noise depends on a low resistance path to ground.
  4. Most connector designs allow full 360° termination of the shield. Make sure the connector offers shielding effectiveness equal to that of the cable. For example, many common connectors are offered with metal-coated plastic, cast zinc, or aluminum back shells. Complimenting the connector and/or cable with each other will ensure that you have proper shield performance throughout your harness or assembly.
  5. Ground the cable at the minimum on one end. This eliminates the potential for noise inducing ground loops. A shielded system is only as good as its weakest component. A high-quality cable is defeated by a low-quality connector. Similarly, a great connector can’t do anything to improve a poor cable.

If you have any questions please feel free to call or email us.

Phone: 775-356-8969

Email: eng@silverstatewire.com

MIL-DTL-55021D simplified

images

(Example of a three conductor, M55021 Cable)

M55021 cable is military rated cable intended for use in the wiring of electrical equipment and components.

Recently being adopted by NEMA under the ANSI/NEMA WC 55021-2013 standard, M55021 cable was most commonly referred to as the MIL-DTL-55021 specification. The specification can still be found at the DLA website along with it’s most recent revisions.

The jacket materials called out in the M55021 spec decide the operating temperature of the cable itself. For example, PVC (Polyvinylchloride) ranges from -40°C to 105°C operating temp. Where the Fluoropolymer jacket types FEP (Fluorinated ethylene propylene) and PTFE (Polytetrafluoroethylene) range for -65°C to 200 °C temp rating.

An example of our the part number sequence for the M55021 specification is constructed is as follows:

Part number: B24C904-903-902P

M55021_Breakout

The part number components are all defined per the specification:

  • Wire Type – This is the base wire used in building the cable. The base components are built using M16878 specs (or newer NEMA HP3 standards). Please contact us for specification details or questions you might have.

The letters that designate the base wire used are:

Letter Wire Specification Letter Wire Specification
B M16878/1 (NEMA HP7)  105°C EE M16878/5 (NEMA HP3)    200°C
C M16878/2 (NEMA HP7)  105°C BJ M16878/17 (NEMA HP7)  105°C
D M16878/3 (NEMA HP7)  105°C CJ M16878/18 (NEMA HP7)  105°C
E M16878/4 (NEMA HP3)  200°C DJ M16878/19 (NEMA HP7)  105°C
  • Conductor Size – This is the AWG size identifier of the wires used to build the cable. This table shows the conductor sizes and stranding available for M55021:
Conductor Size Stranding
26 AWG  to 30 AWG 7 Strands
12 AWG to 24 AWG 19 Strands
10 AWG 37 Strands
  • Conductor Material – This letter signifies the conductor metal in the base wires of the cable:
    • C”  =  Copper
    • S”  =  Copper Clad Steel (CCS)
    • H”  =  High Strength Copper Alloy (HSCA)
  • Wire Colors  – Wire colors consist of one to three numerals. The first number is always the base color. The second and third numbers (If present), represent stripes (Example: “926” – This would be white with red and blue stripes). The color chart below represents all of the colors used. This can also be found in Table 1 of MIL-STD-681F. The most common color codes are White (Single Conductor), White/Black (Two Conductors Twisted), and White/Black/Red (Three Wires twisted).
Code Color Code Color
0 Black 5 Green
1 Brown 6 Blue
2 Red 7 Violet
3 Orange 8 Gray
4 Yellow 9 White
  • Covering over Component Wires – The covering is the shield (If present) and and insulation jacket over the cable. All M55021 shields are made using a braid of the same materials used on the inner wires. The covering over component wires must be identified in the part number by using one of the following letter configurations below:
Letter   Covering  Letter    Covering
U No Shield or Jacket S Shielded, No jacket
P PVC (Polyvinylchloride) Jacket SP Shielded, Extruded PVC Jacket
F FEP (Fluorinated Ethylene Propylene) Jacket SF Shielded, Extruded FEP Jacket
J Polyamide Jacket SJ Shielded, Polyamide Jacket
T PTFE (Polytetrafluoroethylene) Jacket STW Shielded, Wrapped PTFE Jacket
STX Shielded, Extruded PTFE Jacket

Thank you for taking a moment to review our brief description of the M55021 specification. If you have any questions please feel free to contact us.

Phone: (775) 356-8969

Email: eng@silverstatewire.com