Asco 400 Series User manual

Surge Protective Devices Installation & Operation Manual
S50A

Installation, Operation and Maintenance Manual 8221 RevD 08-182
CALIFORNIA CUSTOMERS - PROP 65 WARNING
WARNING: This product can expose you to chemicals including DINP, which
is known to the State of California to cause cancer, and DIDP, which is known to
the State of California to cause birth defects or other reproductive harm. For more
information go to www.P65Warnings.ca.gov.
ADVERTENCIA: Este producto puede exponerle a químicos incluyendo
DINP, que es conocido por el Estado de California como causantes de cáncer y
DIDP, que es conocido por el Estado de California como causante de defectos
de nacimiento u otros daños reproductivos. Para mayor información, visite
www.P65Warnings.ca.gov.
AVERTISSEMENT: Ce produit peut vous exposer à des agents chimiques, y
compris DINP, identiés par l’État de Californie comme pouvant causer le cancer,
et DIDP, reconnu par l’État de Californie comme pouvant causer des malformations
congénitales ou autres troubles de l’appareil reproducteur. Pour de plus amples
informations, prière de consulter www.P65Warnings.ca.gov.

Installation, Operation and Maintenance Manual 8221 RevD 08-183
ASCO SURGE PROTECTIVE DEVICE
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
TABLE OF CONTENTS
INSTALLATION
Figure 2: Leads Short & Straight
Figure 3: Typical Panel Installation
Figure 4: Nipple
Figure 5: Dimensions & Weight
Figure 6: S50A Mounting Options
Voltage Rating & Application
SPDs on Ungrounded Systems
Connecting Optional Form C Dry Contact & Audible Alarm
Figure 7: Leads
6
6
7
7
8
8
8
9
9
9
NORMAL OPERATION
Green LED Indicator
Form C Dry Contact and Audible Alarm Option
Maintenance
Troubleshooting & Service
10
10
10
10
10
INTRODUCTION
Figure 1: NEC
®
Article 285 & UL 1449-4
Parts List
Table 1: Specifications
4
4
5
5

Installation, Operation and Maintenance Manual 8221 RevD 08-184
FIGURE1: NEC
®
ARTICLE 285 & UL 1449-4
Thank you for choosing an ASCO S50A Surge Protective Device (SPD). The S50A is a high quality,
high energy surge suppressor designed to protect sensitive equipment from damaging transient
overvoltage. S50A is parallel connected such that circuit ampacity is unlimited. Proper installation
is important to maximize performance. Please follow steps outlined herein. These instructions are
not intended to replace national or local codes. Follow all applicable electrical codes to ensure
compliance.
Risk of Electric Shock
• ONLY QUALIFIED LICENSED ELECTRICIANS SHOULD INSTALL OR SERVICE SPDS
• SPDS SHOULD NEVER BE INSTALLED OR SERVICED WHEN ENERGIZED OR DURING
ELECTRICAL STORMS
• USE APPROPRIATE SAFETY PRECAUTIONS INCLUDING PERSONAL PROTECTION
EQUIPMENT
• FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN DEATH, SERIOUS INJURY,
AND/OR EQUIPMENT DAMAGE
• WHEN USED IN OUTDOOR APPLICATIONS, CUSTOMER MUST SEAL THE CONDUIT NIPPLE
USING WATERTIGHT FITTINGS (NOT INCLUDED) TO ENSURE A WATERTIGHT CONNECTION
• READ THIS MANUAL IN ITS ENTIRETY PRIOR TO INSTALLING
In the late 2000’s, there were significant nomenclature changes associated with a revision to UL 1449
and 2008 NEC®Article 285. The S50A complies with latest regulatory actions and is UL 1449 & CSA
22.2 No. 269, listed as such (VZCA.E321351). There is an emphasis on installation location, identified
as Types 1, 2 and 3 outlined below.
Type 1 SPD: Installation on the line side or load side of the service disconnect overcurrent device.
Type 1 SPDs may be used in Type 2 installations. Examples: surge arrestors, lightning arrestors, meter
hubs, metering cabinets, ran out of breaker positions, etc.
Type 2 SPD: Downstream of service disconnect; probably will connect via breaker.
Examples: switchboards, power panels, panelboards, equipment, motors, pumps, etc.
Type 3 SPD: Point of Use SPD, sometimes plug-connected SPD.
Type 4 SPD: Has dierent contexts in UL 1449 and CSA 22.2 No. 269. Call for assistance.
SPD Types: Types 1, 2, & 3
Based on Location within electrical distribution system
(also coincides with ANSI/IEEE C62.41.2 - 2002 Categories C, B & A)
WARNING

Installation, Operation and Maintenance Manual 8221 RevD 08-185
ASCO S50A is a Type 1 SPD. It is suitable for use almost anywhere. Type 1 SPDs are evaluated more
rigorously by UL 1449 for NEC®and CEC compliance. Type 1 SPDs and their connecting leads have
been evaluated by UL and CSA for installation on the line side of the service disconnect where there
is no customer-supplied overcurrent protection. Type 1 SPDs include internal overcurrent protection.
As a generalization, it is more practical to install SPDs on the load side of the main overcurrent device
for maintenance and serviceability reasons. When connected on load side of main disconnect, we
recommend connecting via a 30A circuit breaker due to 10 AWG conductors. The circuit breaker
serves as a disconnect switch and provides NEC®and CEC imposed short circuit protection to the
conductors in Type 2 applications.
Simplified Explanation of Operation: SPDs sense overvoltage and create a momentary low impedance
path to redirect harmful surge energy. They reset automatically and wait for the next surge. This is
similar to the pressure relief valve on a water heater: pressure goes up, valve opens to relieve pressure
and then resets. In an electrical system, an SPD senses overvoltage, reduces impedance temporarily,
which equalizes damaging overvoltages and then resets. SPDs are capable of repeating this function
thousands of times.
Parts List
1 - S50A suppressor including 3’ (~1m) conductors
1 - 3/4” conduit nut
1 - L bracket mounting kit; includes two pan head screws
1 - Data Sheet
1 - Installation Sheet (this document)
Most S50As have demonstrated 200kA & 100kA Short Circuit Current Ratings (SCCR) including leads.
See UL Label markings on SPD or see Data Sheet for specs. Supplemental overcurrent protection
is not required to protect this SPD. However, NEC®and CEC convention requires that connecting
conductors have overcurrent protection in Type 2 applications. Follow applicable codes.
This device features internal overcurrent and overtemperature protection that will disconnect eected
surge suppression components at the end of their useful life, but will maintain power to the load – now
unprotected. If this situation is undesirable for the application, follow these instructions for replacing
the device. The S50A is ultrasonically welded closed and contains no user serviceable parts.
TABLE 1: SPECIFICATIONS
Temperature Operating -40oC (-40oF) to 60oC (+140oF)
Temperature Storage -55oC (-67oF) to 65oC (+149oF)
Wire Size & Installation Torque 10 AWG; 18 inch-pounds
Appropriate Circuit Breaker
based on conductor size
30A (SPD includes internal OCP)
NEMA 250 Enclosure Rating Type 4X with appropriate
sealing & sealing condulets
Voltage Rating & Application
Before installing SPD, verify by nameplate voltage or model number that it has the same voltage
rating as the power distribution system. See attached Data Sheet or call ASCO Tech Support at (800)
727-0669 as appropriate. The SPD’s specifier or user should be familiar with the configuration and
arrangement of the power distribution system. The system is defined by how the secondary windings
of the transformer supplying the service entrance main or load are configured. This includes whether
or not the transformer windings are referenced to earth via a grounding conductor. The system
configuration is not based on how any specific load or equipment is connected to a particular power
distribution system. SPDs should be installed per the distribution system, not per a load or motor’s
wiring connection.

Installation, Operation and Maintenance Manual 8221 RevD 08-186
INSTALLATION
Pre-Plan your installation. You need to accomplish the following:
• Meet all National and Local codes (NEC®Article 285, and CEC address SPDs).
• Confirm System voltage to SPD voltage (a 120V SPD will fail instantly on 240V, 277V, etc.).
• Mount SPD as close to panel or equipment as possible to keep leads short. (Long leads hurt
performance substantially.)
• Ensure leads are as short and straight as possible, including neutral and ground. If using a
breaker, use a breaker position that is close to the SPD and the panel’s neutral & ground.
• If using a breaker, recommended breaker size is 30A due to 10 AWG conductor.
• Make sure system is grounded per NEC®and CEC and clear of faults before energizing SPD. (An
inadvertent system problem may fail the SPD.)
• Never Hi-Pot test Any SPD. (Hi-potting will cause SPD to prematurely fail.)
1. Use voltmeter to check voltages and ensure correct SPD. See Data Sheet for specs and wire-
outs.
2. Determine Mounting method (See Figure 6) – weather resistant equipment may be required.
3. If SPD has optional Dry Contact, pre-plan its installation.
4. Remove power from panel/source. Confirm panel/source is de-energized.
5. Identify breaker location and SPD location. Position SPD such that LED is best visible.
6. Mount SPD – weather resistant applications require additional sealing, O-rings, etc.
(not included)
• Remove an appropriately sized knockout from panel.
• Connect conductors as appropriate – leads should be short and straight as possible
(Connect a system Hi-Leg to SPD’ Phase B).
7. Label or mark conductors as appropriate (neutral: white, ground: green, energized: black, hi-
leg: orange).
8. Make sure system is bonded per NEC®and CEC and is clear of hazards or faults before
energizing. (N-G bonding not per NEC®and CEC will fail SPDs: This is the #1 cause of SPD
failures)
9. Energize and confirm proper operation of green LED indicator and/or options.
(Ax supplemental label accessory if appropriate. See Figure 6.)
FIGURE 2: LEADS SHORT & STRAIGHT
X
NOT
GOOD
GOOD
Cut o
Excess Length
Do Not Loop or Coil
Short & Straight

Installation, Operation and Maintenance Manual 8221 RevD 08-187
VWARNING
• Confirm XO N-G Bonding at Upstream Transformer
• Do Not Hi-Pot Test
• Resulting Damage is not Covered Under Warranty
VERIFY THAT ALL POWER CIRCUITS ARE DEENERGIZED
BEFORE MAKING CONNECTIONS
All electrical connections should be performed by a qualied (licensed)
electrician or technician. All wiring must comply with the National Electrical
Code (NEC®) and applicable local codes.
VWARNING
ABC
GN
BREAKER
(Type 1 or individual equipment installations may vary)
▪ Use closest breaker to SPD
▪ Locate SPD close to intended
breaker
▪ Keep Leads Short as Possible
▪ Avoid Sharp Bends
▪ Rotate S50A such that LED
indicator is most visible
▪Outdoor installation requires
appropriate weather sealing at nipple
(gasket, sealing conduit, etc.)
To Protected Loads
FIGURE 3: TYPICAL PANEL INSTALLATION
FIGURE 4: NIPPLE
Sealing Gasket:
Two choices
1.) At 3/4" nom. thread: ID is 1.05"
2.) At 0.14" high 'base step': ID is 1.25"

Installation, Operation and Maintenance Manual 8221 RevD 08-188
For example, suppose a 480V three phase motor appears to be connected as a 480V Delta. In
actuality, the serving distribution system might be a 480Y/277V grounded Wye, with or without a
neutral pulled to the motor or MCC. The system is still a 480Y/277V Wye, even though the load is
connected as a Delta. A grounded Wye has a defined reference to ground (i.e., neutral is bonded
to ground). In contrast, some Delta systems are ungrounded, which have no reference to ground.
SPDs on Ungrounded Systems
Caution – Ungrounded systems are inherently unstable and can produce excessively high line-to-
ground voltages during certain fault conditions. During these fault conditions, any electrical equipment
including an SPD, may be subjected to voltages which exceed their designed ratings. This information
is being provided to the user so that an informed decision can be made before installing any electrical
equipment on an ungrounded power system.
FIGURE 5: DIMENSIONS & WEIGHT
3.26” 3.26”
1.15”
4.13”
3/4”-14
Sized for std 35mm DIN-Rail
3.31” 3.57”
Weight: 1.60 lbs
(0.73 kg)
FIGURE 6: S50A MOUNTING OPTIONS
Bracket Mount
for flat surfaces
Std. 3/4”-14
Nipple
DIN-Rail Mount
(rail not incl.)
If standard front facing label is not
viewable when installed, unit may be
installed so side label is front facing.
• 3/4” pipe nipple (conduit nut included)
• With L-bracket mounting kit accessory
- Standard 35mm DIN-Rail (not included)
L-bracket tightens onto DIN-Rail
- Standard flat mounting surface
Attach L-bracket to surface via
mounting holes

Installation, Operation and Maintenance Manual 8221 RevD 08-189
FIGURE 7: LEADS
Connecting Optional Form C Dry Contact & Audible Alarm
Three (3) 3’ (~1m) 18 AWG wires are included through the nipple with this option. See Figure 6. (These
are smaller than the 10 AWG SPD conductors.) Gray is Common, Blue is Normally Open and Red is
Normally Closed when energized in its expected installation. (When Not energized, the SPD is no
longer in its ‘Normal’ state and contacts will be reversed.) We generally recommend the Normally
Closed configuration because it detects disconnected or failed wiring whereas Normally Open does
not.
If the dry contacts are not utilized, insulate lead ends, coil and secure. Audible Alarm will still function
correctly.
The contact is rated 250V, 5A. Higher energy applications require supplemental relaying. This option
monitors suppression element condition and is not intended for use as phase loss or phase detection
monitoring.
NORMAL OPERATION
Green LED Indicator
The LED indicator illuminates when the SPD is energized and operating correctly. Indicator operation:
Every suppression element is connected via logic to the green LED. Should any suppression element
fail, the green LED will extinguish.
Power
Leads
Dry
Contact
Leads
Blue Grey
Red
• Normally Closed (suggested): Use Gray and Red
• Normally Open: Use Gray and Blue

Installation, Operation and Maintenance Manual 8221 RevD 08-1810
Form C Dry Contact and Audible Alarm Option
Similar to the green LED above, the Dry Contact will change state and the Audible Alarm will sound
upon any suppression element failure. The Audible Alarm may be silenced by removing power to the
SPD.
Maintenance
SPDs require minimal maintenance. We recommend periodic inspection of diagnostic indicators to
ensure proper operation. We also recommend keeping the SPD clean as appropriate.
Troubleshooting & Service
Please contact us for any service related issues. We want to take care of any problems.
Quality SPDs withstand severe duty and attempt to protect their load until failure. There are electrical
anomalies that SPDs cannot protect against. These are generally Sustained Overvoltages also known
as Temporary Overvoltages (TOVs). In this context, Sustained Overvoltages may be only a few cycles.
Failed SPDs tend to be symptoms, not root causes. We suggest treating a failed SPD as a ‘canary in
the coal mine’ as there may be larger issues at play. As a generalization, the single largest ‘killer’ of
SPDs is reference to ground issues. If the SPD shows problems on startup, there is reasonable chance
of bonding/grounding/misapplication issue. This permanently damages the unit. If not corrected, it
will happen again.
There are no user serviceable parts inside. The S50A is ultrasonically welded closed. We strongly
recommend against disassembly.
Units may be returned to the factory for factory service, qualification and return. Please contact factory
at [phone] for assistance.
Any returns need a Return Authorization (RA) number.
Hazardous voltage.
Will cause death or serious injury.
Keep Out.
Qualied personnel only.
Disconnect and lock off all power before
working on this equipment.
VDANGER