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Showing posts with label WIRE. Show all posts

Monday, September 9, 2013

Understanding Electrical Wire Lettering....for your philippine electrical concerns...needs...installation...orders...safeelectrical2013@gmail.com

Understanding Electrical Wire Lettering

What do the Letters on Electrical Wire Mean?

By Timothy Thiele, About.com Guide

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Understanding electrical wire lettering will help you decide which type wire is best for the installation that you are using. There are many different types of insulation used for residential use. Some of the most commonly used are THHN, THWN, THW and XHHN.

THWN is flame-retardant and heat resistant. Its insulation can be used in dry, and damp locations. This is not to be used in wet locations however. THHN wire is commonly used in conduit installations in residential and commercial installations. Due to its nylon insulation, it is smaller and is more flexible than the more rigid plastic coated wire.

THWN is flame retardant, heat resistant, moisture resistant, gasoline resistant, and oil resistant. It can be used in dry, damp, or wet locations. This cable is often used in underground conduit feeds that will be subject to moisture and other liquids.

THW is heat resistant, flame retardant, and moisture resistant. It can be used for dry, damp, and wet locations. It too can be used for underground feeds that are subject to moisture.

XHHN is used for service entrance and is designated type SE cable.

So exactly what do the letters on the wire mean? Her's a breakdown to help make some sense of the lettering.

The "T" stands for thermoplastic insulated cable.
A single "H" means the wire is heat resistant.
"HH" means that the wire is heat resistant and can withstand a higher temperature. This wire can withstand heat up to 194 degrees Fahrenheit.
A "W" means that the wire is approved for damp and wet locations. This wire is also suitable for dry locations.
The "X" means the cable is made of a synthetic polymer that is flame-retardant.
The "N" is for the nylon coating that covers the wire insulation.

Sunday, September 8, 2013

Frequently asked cables questions.. for your philippine electrical concerns...needs...installation...orders...safeelectrical2013@gmail.com

Frequently asked cables questions

Frequently asked questions

What is the difference between the Power & Control Cables?

Power Cables - No. of Cores 2,3, 3 1/2 & 4 Core

Control Cables - Upto 63 Cores or above

Standards Applicable for both - IS-694 & IS-1554 .

What is the difference between Unsheathed & Sheathed Single Core Cable as per IS-694?

Unsheathed - Only Core Insulation will be done and there will be no Sheathing.

Sheathed - Sheathing will be done on Core Insulation.

What is the difference between Control & Instrumentation Cable?

Control Cables – They are generally Core Constructed.

Instrumentation Cables – They are generally Pair Constructed with Shielding.

What is the difference between Thermocouple & Instrumentation Cable?

Conductor Material is Different for both.

What is the difference between Armoured & Unarmoured Cable?

a. Armour.

b. Inner Sheath will be provided for Armoured Cable before Armouring.

What is a Co-Axial Cable?

This type of cable is used for Very High Frequency (V.H.F.) Applications.

What are the Different types of PVCs and what are its normal working temperatures?

a. Insulation - PVC General Purpose (Type A) - 70 Deg.C

HR PVC (Type C) - 90 Deg.C

b. Sheath Material PVC St1 - 70 Deg. C

HR PVC / PVC St2 - 90 Deg. C

FRLS PVC - 105 Deg. C.

What is the Voltage Grade?

Low Voltage Grade -- upto and including 1.1 KV

High Voltage Grade -- above 1.1 KV

Number of Strands for:

a. Solid Conductor - One

b. Multistrand - either 3 or 7

c. Flexible - No of Strands above 7

- Dia of Strands upto 0.3 mm .

What are the other Sizes of Strands in case of flexible Conductor?

0.1mm, 0.15mm, 0.2mm & 0.3mm.

Dia of Strands for 1.5 Sq.mm can be:

a. Incase of 7 Strands - 7/0.52

b. Incase of 0.3 mm dia each - 21 Strands

c. Incase of 0.2 mm dia each - 48 Strands.

What is the Core / Pair Identification incase of LDPE Insulated Cable?

By Colour or By Number printed Al-Mylar Tape / Polyster Tape.

What is the Purpose of Screening?

To reduce the interference by nearby sources.

What are the different types of Screenings?

a. Al-Mylar / Cu-Mylar Tape

b. ATC or ABC Braiding.

Which type of Screening is Cheaper?

AL-Mylar.

Noise in Instrumentation Cable is called?

Reduction of Accuracy of Signal passing through the Cable.

What is Thermocouple Extention Cable?

Thermocouple Element material & Thermocouple Cable Conductor materials are same.

What is Thermocouple Compensating Cable?

If the Electrical properties of the Conductor material used for the Thermocouple Cable is almost similar to that of Thermocouple element material it is called Compensating Cable.

Why there is no Compensating Cables for Tx, Jx & Ex Type T/C Cables?

This Thermocouple Element material itself is cheaper.

What will be the Normal Insulation Thickness for Telephone Cables?

a. Core Insulation - 0.2, 0.3 mm

b. Sheath - 0.5 to 1.2 mm.

What is the difference between RTD / Instrumentation Cable?

RTD Cables will be Triad Constructed.

Instrumentation Cables are Pair constructed.

What are the normal sizes of Control Cables?

1.5 & 2.5 Sq.mm

What will be the normal Conductor sizes for instrumentation / RTD Cables?

0.5, 0.75, 1.0, 1.5 & 2.5 Sq.mm

Thermocouple Cable Conductor normal sizes for:

a. Single pair - 16 AWG (1.295 mm dia)

b. Multi pair - 20 AWG (0.813 mm dia)

What are the standards for T/C Cables?

IS-8784, ANSI MC 96.1 (Please refer our Catalogue for other Standards.)

What is the Temperature Tolerance (+/- deg. C) allowable for Thermocouple cables for T/C Cables?

a. IS 8784 +/- 3 Deg. C

b. ANSI MC 96.1 +/- 2.2 Deg. C

Colour code as per IS 1554 for Core constructed Cables ?

a. Upto 5 Cores by different colours i.e for 2 Cores Red & Black, for 3 Cores Red, Yellow & Blue, for 4 cores Red, Yellow, Blue & Black, for 5 Cores Red, Yellow, Blue, Black & Grey.

b. Above 5 Cores : One Core Yellow and One Core Blue remaining Grey in each layer (or) any single colour with numbers printed.

For above 5 Cores Grey with number printing is our normal practice.

What are the 3 types of Braided (Metal Braiding) Cables can manufactured?

a. Annealed Tinned Copper Braided Cables.

b. Annealed Bare Copper Braided Cables.

c. Nickle Plated Copper Braided cables

d. G.I. Braided Cables.

What is the Temperature with standability of PTFE & Fibre Glass?

PTFE - 250 Deg.C,

FG Cables 400 Deg.C

for your philippine electrical concerns...needs...installation...orders...safeelectrical2013@gmail.com

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THERMOPLASTIC HEAT- AND MOISTURE- RESISTANT WIRE (THW), 600 VOLTS, 75 °C...FACTS YOU SHOULD KNOW...for your philippine electrical concerns...needs...installation...orders...safeelectrical2013@gmail.com

THERMOPLASTIC HEAT- AND MOISTURE- RESISTANT WIRE (THW), 600 VOLTS, 75 °C

Size of Conductor		No. & Nominal Dia. of Wire	Wall Thickness	Approximate Overall Diameter	Ampacity 75 °C	Nominal Weight	StandardLength
MM Size	Approximate AWG Size		MM	MM		KG/KM
Solid
1.6 mm	14		1.20	4.0	20	32.66	150 m
2.0 mm	12		1.20	4.4	25	44.82	150 m
2.6 mm	10		1.20	5.0	35	67.27	150 m
3.2 mm	8		1.60	6.4	50	105.27	150 m
Stranded
2.0 mm2	14	7 x 0.60 mm	1.20	4.2	20	34.31	150 m
3.5 mm2	12	7 x 0.80 mm	1.20	4.8	25	51.86	150 m
5.5 mm2	10	7 x 1.00 mm	1.20	5.4	35	73.51	150 m
8.0 mm2	8	7 x 1.20 mm	1.60	6.8	50	110.49	150 m
14 mm2	6	7 x 1.60 mm	1.60	8.0	65	176.55	150 m
22 mm2	4	7 x 2.00 mm	1.60	9.2	85	258.98	150 m
30 mm2	2	7 x 2.30 mm	1.60	10.1	115	331.46	150 m
38 mm2	1-19	19 x 1.60 mm	2.00	12.0	130	447.00	300 m
50 mm2	1/0-19	19 x 1.80 mm	2.00	13.0	150	543.44	300 m
60 mm2	2/0-19	19 x 2.00 mm	2.00	14.0	175	656.85	300 m
80 mm2	3/0-19	19 x 2.30 mm	2.00	15.5	200	847.90	300 m
100 mm2	4/0-19	19 x 2.60 mm	2.00	17.0	230	1063.71	300 m
125 mm2	250 MCM	37 x 2.10 mm	2.40	19.5	255	1362.26	300 m
150 mm2	300 MCM	37 x 2.30 mm	2.40	20.9	285	1613.79	300 m
	350 MCM	37 x 2.47 mm	2.40	22.1	310	1840.86	300 m
200 mm2	400 MCM	37 x 2.60 mm	2.40	23.0	335	2029.87	300 m
250 mm2	500 MCM	61 x 2.30 mm	2.40	25.5	380	2590.95	300 m
	600 MCM	61 x 2.52 mm	2.40	27.5	420	3073.95	300 m
325 mm2	650 MCM	61 x 2.60 mm	2.80	29.0	435	3288.51	300 m
	750 MCM	61 x 2.82 mm	2.80	30.9	475	3859.40	300 m
400 mm2	800 MCM	61 x 2.90 mm	2.80	31.7	490	4077.32	300 m
500 mm2	1000 MCM	61 x 3.20 mm	2.80	34.4	545	4919.24	300 m

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Monday, September 9, 2013